Overview
Definition
Acute respiratory illness caused by influenza A or B viruses.
Epidemiology
Causes annual seasonal epidemics.
Etiology & Risk Factors
- Influenza viruses (respiratory droplet transmission)
Clinical Symptoms
- Abrupt onset high fever
- Myalgias
- Headache
- Cough
- Sore throat
Clinical Approach
Diagnosis
- Rapid Influenza Diagnostic Test (RIDT)
- Viral PCR
Management
- Oseltamivir (Tamiflu) if within 48 hours
- Supportive care
- Annual vaccination
Complications
- Secondary bacterial pneumonia (S. aureus)
- Myocarditis
- Death in vulnerable populations