Microbiology, 2021

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1006 24 • Digestive System Infections imaging, endoscopy, lab tests, and other available data. Detecting the toxin in stool samples is used to confirm diagnosis. Although culture is preferred, it is rarely practical in clinical practice because the bacterium is an obligate anaerobe. Nucleic acid amplification tests, including PCR, are considered preferable to ELISA testing for molecular analysis. The first step of conventional treatment is to stop antibiotic use, and then to provide supportive therapy with electrolyte replacement and fluids. Metronidazole is the preferred treatment if the C. difficile diagnosis has been confirmed. Vancomycin can also be used, but it should be reserved for patients for whom metronidazole was ineffective or who meet other criteria (e.g., under 10 years of age, pregnant, or allergic to metronidazole). A newer approach to treatment, known as a fecal transplant, focuses on restoring the microbiota of the gut in order to combat the infection. In this procedure, a healthy individual donates a stool sample, which is mixed with saline and transplanted to the recipient via colonoscopy, endoscopy, sigmoidoscopy, or enema. It has been reported that this procedure has greater than 90% success in resolving C. difficile infections. 12 CHECK YOUR UNDERSTANDING • How does antibiotic use lead to C. difficile infections? Foodborne Illness Due to Bacillus cereus Bacillus cereus, commonly found in soil, is a gram-positive endospore-forming bacterium that can sometimes cause foodborne illness. B. cereus endospores can survive cooking and produce enterotoxins in food after it has been heated; illnesses often occur after eating rice and other prepared foods left at room temperature for too long. The signs and symptoms appear within a few hours of ingestion and include nausea, pain, and abdominal cramps. B. cereus produces two toxins: one causing diarrhea, and the other causing vomiting. More severe signs and symptoms can sometimes develop. Diagnosis can be accomplished by isolating bacteria from stool samples or vomitus and uneaten infected food. Treatment involves rehydration and supportive therapy. Antibiotics are not typically needed, as the illness is usually relatively mild and is due to toxin activity. Foodborne Illness Due to Yersinia The genus Yersinia is best known for Yersinia pestis, a gram-negative rod that causes the plague. However, Y. enterocolitica and Y. pseudotuberculosis can cause gastroenteritis. The infection is generally transmitted through the fecal-oral route, with ingestion of food or water that has been contaminated by feces. Intoxication can also result because of the activity of its endotoxin and exotoxins (enterotoxin and cytotoxin necrotizing factor). The illness is normally relatively mild and self-limiting. However, severe diarrhea and dysentery can develop in infants. In adults, the infection can spread and cause complications such as reactive arthritis, thyroid disorders, endocarditis, glomerulonephritis, eye inflammation, and/or erythema nodosum. Bacteremia may develop in rare cases. Diagnosis is generally made by detecting the bacteria in stool samples. Samples may also be obtained from other tissues or body fluids. Treatment is usually supportive, including rehydration, without antibiotics. If bacteremia or other systemic disease is present, then antibiotics such as fluoroquinolones, aminoglycosides, doxycycline, and trimethoprim-sulfamethoxazole may be used. Recovery can take up to two weeks. CHECK YOUR UNDERSTANDING • Compare and contrast foodborne illnesses due to B. cereus and Yersinia. 12 Faith Rohlke and Neil Stollman. “Fecal Microbiota Transplantation in Relapsing Clostridium difficile Infection,” Therapeutic Advances in Gastroenterology 5 (2012) 6: 403–420. doi: 10.1177/1756283X12453637. Access for free at openstax.org.
24.3 • Bacterial Infections of the Gastrointestinal Tract 1007 Disease Profile Bacterial Infections of the Gastrointestinal Tract Bacterial infections of the gastrointestinal tract generally occur when bacteria or bacterial toxins are ingested in contaminated food or water. Toxins and other virulence factors can produce gastrointestinal inflammation and general symptoms such as diarrhea and vomiting. Bacterial GI infections can vary widely in terms of severity and treatment. Some can be treated with antibiotics, but in other cases antibiotics may be ineffective in combating toxins or even counterproductive if they compromise the GI microbiota. Figure 24.22 and Figure 24.23 the key features of common bacterial GI infections.
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Microbiology SENIOR CONTRIBUTING AU
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OPENSTAX OpenStax provides free, pe
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Contents Preface 1 CHAPTER 1 An Inv
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9.2 Oxygen Requirements for Microbi
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18.1 Overview of Specific Adaptive
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Appendix C Metabolic Pathways 1155
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Preface 1 PREFACE Welcome to Microb
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Preface 3 that often confer critica
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Preface 5 further. Our features inc
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Preface 7 and science, and pursues
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CHAPTER 1 An Invisible World Figure
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1.1 • What Our Ancestors Knew 11
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1.2 • A Systematic Approach 17 Th
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1.2 • A Systematic Approach 19 Fi
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1.2 • A Systematic Approach 21 Ta
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1.3 • Types of Microorganisms 23
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1 • Summary 31 SUMMARY 1.1 What O
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1 • Review Questions 33 17. The p
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CHAPTER 2 How We See the Invisible
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2.1 • The Properties of Light 37
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2.1 • The Properties of Light 39
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2.2 • Peering Into the Invisible
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2.3 • Instruments of Microscopy 4
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2.4 • Staining Microscopic Specim
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2 • Review Questions 71 REVIEW QU
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CHAPTER 3 The Cell Figure 3.1 Micro
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3.1 • Spontaneous Generation 75 F
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3.2 • Foundations of Modern Cell
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3.3 • Unique Characteristics of P
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3.4 • Unique Characteristics of E
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3 • Summary 125 SUMMARY 3.1 Spont
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3 • Review Questions 127 3. Which
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3 • Review Questions 129 Critical
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CHAPTER 4 Prokaryotic Diversity Fig
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4.1 • Prokaryote Habitats, Relati
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4.2 • Proteobacteria 139 for or s
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4.2 • Proteobacteria 141 Class Al
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4.2 • Proteobacteria 143 Class Be
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4.2 • Proteobacteria 145 Figure 4
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4.2 • Proteobacteria 147 Class Ga
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4.3 • Nonproteobacteria Gram-Nega
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4.4 • Gram-Positive Bacteria 157
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4.6 • Archaea 167 The class Therm
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4.6 • Archaea 169 thus is a livin
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4 • Summary 171 SUMMARY 4.1 Proka
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4 • Review Questions 173 REVIEW Q
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4 • Review Questions 175 39. Expl
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CHAPTER 5 The Eukaryotes of Microbi
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5.1 • Unicellular Eukaryotic Para
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Figure 5.7 5.1 • Unicellular Euka
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5.2 • Parasitic Helminths 193 hel
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5.2 • Parasitic Helminths 195 Fig
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5.2 • Parasitic Helminths 197 Fig
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5.2 • Parasitic Helminths 199 MIC
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5.3 • Fungi 201 Figure 5.25 Multi
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5.3 • Fungi 203 Figure 5.27 zygos
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5.3 • Fungi 205 diploid stages (F
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5.3 • Fungi 207 Figure 5.32 prese
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5.3 • Fungi 209 MICRO CONNECTIONS
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5.4 • Algae 211 and other photosy
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5.5 • Lichens 213 Figure 5.37 Chl
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5.5 • Lichens 215 marina. (b) Thi
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5 • Review Questions 217 REVIEW Q
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CHAPTER 6 Acellular Pathogens Figur
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6.1 • Viruses 221 assembly of vir
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6.1 • Viruses 223 Viral Structure
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6.1 • Viruses 225 Figure 6.5 (a)
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6.1 • Viruses 227 LINK TO LEARNIN
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6.2 • The Viral Life Cycle 229 on
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6.2 • The Viral Life Cycle 231 Fi
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6.2 • The Viral Life Cycle 237 by
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6.2 • The Viral Life Cycle 239 Ca
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6.3 • Isolation, Culture, and Ide
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6.4 • Viroids, Virusoids, and Pri
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6.4 • Viroids, Virusoids, and Pri
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6 • Summary 253 SUMMARY 6.1 Virus
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6 • Review Questions 255 18. A/an
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CHAPTER 7 Microbial Biochemistry Fi
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7.1 • Organic Molecules 259 Figur
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7.1 • Organic Molecules 261 Figur
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7.2 • Carbohydrates 263 and the m
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7.2 • Carbohydrates 265 Figure 7.
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7.3 • Lipids 267 Figure 7.11 Star
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7.3 • Lipids 269 Figure 7.13 This
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7.3 • Lipids 271 Figure 7.15 Five
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7.4 • Proteins 273 Figure 7.17 Am
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7.4 • Proteins 275 Figure 7.19 Re
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7.4 • Proteins 277 Figure 7.23 Pr
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7.5 • Using Biochemistry to Ident
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7.5 • Using Biochemistry to Ident
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7 • Review Questions 283 as hormo
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7 • Review Questions 285 19. A tr
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CHAPTER 8 Microbial Metabolism Figu
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8.1 • Energy, Matter, and Enzymes
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8.2 • Catabolism of Carbohydrates
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8.3 • Cellular Respiration 301 8.
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8.3 • Cellular Respiration 303 Fi
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8.4 • Fermentation 305 If respira
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8.4 • Fermentation 307 Common Fer
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8.5 • Catabolism of Lipids and Pr
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8.6 • Photosynthesis 311 independ
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8.6 • Photosynthesis 313 Oxygenic
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8.7 • Biogeochemical Cycles 315 L
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8.7 • Biogeochemical Cycles 317 N
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8.7 • Biogeochemical Cycles 319 F
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8.7 • Biogeochemical Cycles 321 F
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8 • Summary 323 oxygen as the fin
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8 • Review Questions 325 4. To wh
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8 • Review Questions 327 Matching
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CHAPTER 9 Microbial Growth Figure 9
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9.1 • How Microbes Grow 331 and a
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9.1 • How Microbes Grow 333 The G
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9.1 • How Microbes Grow 335 Susta
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9.1 • How Microbes Grow 337 chang
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9.1 • How Microbes Grow 339 Figur
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9.1 • How Microbes Grow 341 trans
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9.1 • How Microbes Grow 343 micro
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9.2 • Oxygen Requirements for Mic
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9.3 • The Effects of pH on Microb
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9.4 • Temperature and Microbial G
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9.4 • Temperature and Microbial G
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9.5 • Other Environmental Conditi
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9.6 • Media Used for Bacterial Gr
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9 • Summary 361 SUMMARY 9.1 How M
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9 • Review Questions 363 7. Filam
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9 • Review Questions 365 Matching
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9 • Review Questions 367 Critical
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CHAPTER 10 Biochemistry of the Geno
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10.1 • Using Microbiology to Disc
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10.2 • Structure and Function of
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10 • Summary 401 SUMMARY 10.1 Usi
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10 • Review Questions 403 3. Whic
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10 • Review Questions 405 Short A
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CHAPTER 11 Mechanisms of Microbial
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11.1 • The Functions of Genetic M
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11.2 • DNA Replication 411 Figure
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11.2 • DNA Replication 413 Figure
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11.2 • DNA Replication 415 strand
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11.2 • DNA Replication 417 telome
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11.3 • RNA Transcription 419 Figu
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11.3 • RNA Transcription 421 the
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11.4 • Protein Synthesis (Transla
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11.5 • Mutations 429 Effects of M
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11.5 • Mutations 431 In recent ye
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11.5 • Mutations 433 Figure 11.20
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11.5 • Mutations 435 formation of
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11.6 • How Asexual Prokaryotes Ac
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11.7 • Gene Regulation: Operon Th
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11 • Summary 457 SUMMARY 11.1 The
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11 • Summary 459 undamaged DNA st
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11 • Review Questions 461 11. Whi
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11 • Review Questions 463 46. ___
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71. The following figure is from Mo
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CHAPTER 12 Modern Applications of M
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12.1 • Microbes and the Tools of
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12.2 • Visualizing and Characteri
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12.3 • Whole Genome Methods and P
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12.3 • Whole Genome Methods and P
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12.4 • Gene Therapy 499 Figure 12
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12.4 • Gene Therapy 501 overall w
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12 • Summary 503 SUMMARY 12.1 Mic
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12 • Review Questions 505 11. The
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CHAPTER 13 Control of Microbial Gro
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13.1 • Controlling Microbial Grow
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13.2 • Using Physical Methods to
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13.3 • Using Chemicals to Control
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13.4 • Testing the Effectiveness
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13 • Summary 553 commonly used to
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13 • Review Questions 555 12. Ble
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CHAPTER 14 Antimicrobial Drugs Figu
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14.1 • History of Chemotherapy an
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14.1 • History of Chemotherapy an
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14.2 • Fundamentals of Antimicrob
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14.2 • Fundamentals of Antimicrob
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14.3 • Mechanisms of Antibacteria
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14.4 • Mechanisms of Other Antimi
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14.5 • Drug Resistance 591 Common
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14.5 • Drug Resistance 593 negati
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14.5 • Drug Resistance 595 Clavul
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14.7 • Current Strategies for Ant
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14.7 • Current Strategies for Ant
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14 • Summary 605 cells. • Becau
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14 • Review Questions 609 50. Why
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CHAPTER 15 Microbial Mechanisms of
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15.1 • Characteristics of Infecti
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15.2 • How Pathogens Cause Diseas
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15.3 • Virulence Factors of Bacte
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15.4 • Virulence Factors of Eukar
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15.4 • Virulence Factors of Eukar
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15 • Review Questions 647 protect
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15 • Review Questions 649 Critica
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CHAPTER 16 Disease and Epidemiology
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16.1 • The Language of Epidemiolo
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16.1 • The Language of Epidemiolo
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16.2 • Tracking Infectious Diseas
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16.3 • Modes of Disease Transmiss
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16.4 • Global Public Health 673 C
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16.4 • Global Public Health 675 S
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16 • Summary 677 SUMMARY 16.1 The
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16 • Review Questions 679 Matchin
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16 • Review Questions 681 20. Wha
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CHAPTER 17 Innate Nonspecific Host
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17.1 • Physical Defenses 687 know
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17.1 • Physical Defenses 689 Figu
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17.2 • Chemical Defenses 691 Phys
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17.2 • Chemical Defenses 693 sali
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17.2 • Chemical Defenses 695 prod
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17.2 • Chemical Defenses 697 Figu
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17.2 • Chemical Defenses 699 Clin
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17.3 • Cellular Defenses 701 Hema
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17.3 • Cellular Defenses 703 stra
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17.3 • Cellular Defenses 705 Clin
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17.3 • Cellular Defenses 707 Figu
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17.4 • Pathogen Recognition and P
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17.4 • Pathogen Recognition and P
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17.5 • Inflammation and Fever 713
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17 • Summary 719 SUMMARY 17.1 Phy
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17 • Review Questions 721 8. Hist
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17 • Review Questions 723 Short A
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CHAPTER 18 Adaptive Specific Host D
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18.1 • Overview of Specific Adapt
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18.2 • Major Histocompatibility C
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18.3 • T Lymphocytes and Cellular
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18.4 • B Lymphocytes and Humoral
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18.4 • B Lymphocytes and Humoral
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18.5 • Vaccines 751 pathogen—bu
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18.5 • Vaccines 753 Eye on Ethics
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18.5 • Vaccines 755 for Disease C
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18.5 • Vaccines 757 Classes of Va
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18 • Summary 759 SUMMARY 18.1 Ove
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18 • Review Questions 761 5. MHC
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18 • Review Questions 763 20. Mat
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CHAPTER 19 Diseases of the Immune S
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19.1 • Hypersensitivities 767 Fig
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19.1 • Hypersensitivities 769 bin
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19.1 • Hypersensitivities 771 mec
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19.1 • Hypersensitivities 775 CHE
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19.1 • Hypersensitivities 777 Cli
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19.1 • Hypersensitivities 779 MIC
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19.2 • Autoimmune Disorders 783 t
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19.2 • Autoimmune Disorders 785 F
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19.2 • Autoimmune Disorders 787 M
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19.2 • Autoimmune Disorders 789 F
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19.3 • Organ Transplantation and
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19.4 • Immunodeficiency 793 and m
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19.4 • Immunodeficiency 795 CHECK
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19.5 • Cancer Immunobiology and I
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19 • Summary 799 SUMMARY 19.1 Hyp
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19 • Review Questions 801 13. All
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CHAPTER 20 Laboratory Analysis of t
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20.2 • Detecting Antigen-Antibody
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20.3 • Agglutination Assays 823 a
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20.3 • Agglutination Assays 825 F
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20.3 • Agglutination Assays 829 s
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20.4 • EIAs and ELISAs 831 Mechan
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20.4 • EIAs and ELISAs 833 Figure
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20.4 • EIAs and ELISAs 837 • Wh
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20.5 • Fluorescent Antibody Techn
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20 • Review Questions 849 20.4 EI
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20 • Review Questions 851 15. Sup
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CHAPTER 21 Skin and Eye Infections
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21.3 • Viral Infections of the Sk
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21.4 • Mycoses of the Skin 881 se
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21.4 • Mycoses of the Skin 883 fr
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21.5 • Protozoan and Helminthic I
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21 • Summary 891 SUMMARY 21.1 Ana
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CHAPTER 22 Respiratory System Infec
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22.4 • Respiratory Mycoses 931 ha
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22.4 • Respiratory Mycoses 933 Fi
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22.4 • Respiratory Mycoses 935 re
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Figure 22.29 22.4 • Respiratory M
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22 • Review Questions 939 200 vir
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CHAPTER 23 Urogenital System Infect
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Page 1001 and 1002: 24.2 • Microbial Diseases of the
Page 1019: 24.3 • Bacterial Infections of th
Page 1025 and 1026: 24.4 • Viral Infections of the Ga
Page 1035 and 1036: 24.6 • Helminthic Infections of t
Page 1047 and 1048: 24 • Summary 1033 SUMMARY 24.1 An
Page 1049 and 1050: 24 • Review Questions 1035 6. Whi
Page 1051 and 1052: CHAPTER 25 Circulatory and Lymphati
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Page 1055 and 1056: 25.1 • Anatomy of the Circulatory
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25.3 • Viral Infections of the Ci
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Figure 25.26 25.3 • Viral Infecti
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25.4 • Parasitic Infections of th
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25 • Review Questions 1089 • To
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25 • Review Questions 1091 Critic
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CHAPTER 26 Nervous System Infection
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26.1 • Anatomy of the Nervous Sys
Page 1111 and 1112:
26.1 • Anatomy of the Nervous Sys
Page 1113 and 1114:
26.2 • Bacterial Diseases of the
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Page 1117 and 1118:
Page 1119 and 1120:
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Page 1123 and 1124:
Page 1125 and 1126:
Page 1127 and 1128:
26.3 • Acellular Diseases of the
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Page 1131 and 1132:
Page 1133 and 1134:
Page 1135 and 1136:
Page 1137 and 1138:
Figure 26.19 26.3 • Acellular Dis
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26.4 • Fungal and Parasitic Disea
Page 1141 and 1142:
Page 1143 and 1144:
Page 1145 and 1146:
Page 1147 and 1148:
26 • Review Questions 1133 are fa
Page 1149 and 1150:
26 • Review Questions 1135 Matchi
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26 • Review Questions 1137 59. Th
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A • Fundamentals of Physics and C
Page 1155 and 1156:
Page 1157 and 1158:
Page 1159 and 1160:
Page 1161 and 1162:
Page 1163 and 1164:
B • Mathematical Basics 1149 APPE
Page 1165 and 1166:
B • Mathematical Basics 1151 Mult
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B • Mathematical Basics 1153 The
Page 1169 and 1170:
C • Metabolic Pathways 1155 APPEN
Page 1171 and 1172:
C • Metabolic Pathways 1157 Entne
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C • Metabolic Pathways 1159 Figur
Page 1175 and 1176:
C • Metabolic Pathways 1161 Elect
Page 1177 and 1178:
APPENDIX D Taxonomy of Clinically R
Page 1179 and 1180:
D • Taxonomy of Clinically Releva
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Page 1189 and 1190:
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E • Glossary 1177 APPENDIX E Glos
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E • Glossary 1179 destruction by
Page 1195 and 1196:
E • Glossary 1181 pollutants from
Page 1197 and 1198:
E • Glossary 1183 chromosome disc
Page 1199 and 1200:
E • Glossary 1185 cysts are forme
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E • Glossary 1187 occurring ectop
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E • Glossary 1189 molecules of DN
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E • Glossary 1191 glycoprotein co
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E • Glossary 1193 image point is
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E • Glossary 1195 discontinuously
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E • Glossary 1197 infection cause
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E • Glossary 1199 target cells by
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E • Glossary 1201 intact ribosome
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E • Glossary 1203 point source sp
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E • Glossary 1205 complexes forme
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E • Glossary 1207 antibody is fir
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E • Glossary 1209 the number of c
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E • Glossary 1211 the reciprocal
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E • Glossary 1213 vector animal (
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1215 ANSWER KEY Chapter 1 1. D 2. D
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1217 B 18. A, C, B 19. peristalsis
Page 1233 and 1234:
Index 1219 INDEX Symbols +ssRNA 237
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Index 1221 antigen-presenting cells
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Index 1223 Bordetella 142 Bordetell
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Index 1225 chromosomes 372, 394 chr
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Index 1227 de Duve 113 dead zone 35
Page 1243 and 1244:
Index 1229 Enteroinvasive E. coli (
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Index 1231 Gardnerella vaginalis 47
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Index 1233 shunt 298 Hfr cell 443 H
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Index 1235 iron lungs 1118 iron-sul
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Index 1237 maturation 230 mature na
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Index 1239 Health 501 National Noti
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Index 1241 patterns (PAMPs) 710 pat
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Index 1243 primary lymphoid tissue
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Index 1245 596, 1048, 1051, 1051 ri
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Index 1247 sterilant 511, 541 steri
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Index 1249 toxigenicity 633 toxin 6
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Index 1251 water activity 522 water
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Microbiology, 2021

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