Chapter 18
Chapter 18
Chapter 18
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43<br />
Influenza (Flu) by influenza virus<br />
• Orthomyxovirus (segmented virus)<br />
• Classified into A, B, and C groups<br />
• 16 HA and 9 NA<br />
• Influenza Pandemics<br />
• 19<strong>18</strong>, HswN1 (Spanish flu)<br />
• 50~ 100 million moratlity<br />
• 1947, H1N1<br />
• 1957, H2N2 (Asian flu)<br />
• 1968, H3N2 (Hong Kong flu)<br />
• 1977, H1N1 (Russian flu)<br />
• Avian flu- H5N1(1997~)