demographics

• More severe in Susceptible population: Aged, young, pregnant, immunosuppressed, diabetes, chronic disease etc.

Aetiology

• Influenza virus

influenza A (H3N2) most common in australia

Causes pandemics due to rapid evolution and virulence

virology

• Incubation 1-5 days
• contagious 24 hours before to 7 days after symptoms.
• Person to person spread. Crowd, school, aged care etc.
• self limiting

Clinical:

mostly uncomplicated and self limiting/

• Fever (one third of children have fever without other symptoms)
• Rigors or chills