Community-Associated Staphylococcus aureus ... - SWACM

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Concordance Among Index CaseInfecting and Colonizing StrainsColonizing strains =Infecting strains: 109(67%)Index cases163Colonizing strains ≠Infecting strains: 54(33%)Intrafamilial Transmission• Definition: an identical strain carried by 2 ormore household members (contacts and/orindex case)• Occurred in 105 of 163 households (64%)HH colonizingstrain =Infectingstrain: 60(55%)HH colonizingstrain ≠Infectingstrain: 29(27%)No HHcontactColonization20 (18%)HH colonizingstrain =Infectingstrain: 15(28%)HH colonizingstrain =Infectingstrain: 28(52%)No HH contactColonization11(20%)Intrafamilial TransmissionNumber of householdmembers, (mean ± SD)Number of people perbedroom, (mean ± SD)MRSA colonization pressure,(mean ± SD)MSSA colonization pressure,(mean ± SD)HouseholdTransmission ofS. <strong>aureus</strong>No HouseholdTransmission ofS. <strong>aureus</strong>P-value5.2 ± 1.9 3.7 ± 1.0
Risk FactorRisk Factors for Nasal MRSAColonizationMRSA vs. Not MRSAOdds Ratio95% CIMedicaid or no insurance 3.3 1.6 - 7.0African-American race 3.5 1.7-7.3Crowded household (>2 people/bedroom) 2.7 1.4-5.3ER or UC visit in past 6 months 2.3 1.3 - 4.0Antibiotic use in past year 2.4 1.3 – 4.7Hospitalization in past year 2.4 1.3 – 4.2Prior systemic infection 5.2 3.0 – 9.0Household member works in healthcare 2.8 1.6 – 5.0CA-MRSA in the Environment• MRSA can survive on some surfaces for hoursto months– Temperature– Humidity– Amount of germs present– Type of surface– Nutrients on surfaces• When surfaces aren’t cleaned and conditions are goodfor bacterial growth, MRSA is more likely to survive forlonger periodsFritz SA et al., Pediatrics 2008; 121:1090-109815
Page 1: Evolution, Epidemiology, andEradica
Page 6 and 7: # OF STRAINS TESTEDCEFAZOLIN/OXACIL
Page 9: Twelve-Month Evaluation of aHouseho
Page 13: CA-MRSA Transmission Dynamics• Mo

Community-Associated Staphylococcus aureus ... - SWACM

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