Influenza

Question 1

Influenza Definition

Answer 1

• Acute respiratory illness
• Complicated is when hospital admission required, symptoms of lower respiratory tract infection, CNS involvement and/or significant exacerbation of underlying condition

Question 2

Influenza Pathogenesis

Answer 2

• Three serotypes: A, B, C
• A is more frequent
• B tends to circulate with A in yearly outbreaks and causes less severe illness
• C tends to cause mild or asymptomatic illness akin to a cold
• Influenza A further categorised into H and N