Overview
Educational academic overview: influenza A and B drive seasonal epidemics; antigenic drift underlies annual vaccine updates. Study material only.
Symptoms
- sudden fever
- cough and sore throat
- body aches
- tiredness
Causes
- infection with influenza viruses spread by droplets
Risk factors
- close contact with infected people
- very young or older age
- pregnancy or long-term health conditions
Prevention
- annual influenza vaccination where recommended
- hand hygiene and covering coughs
- staying home when unwell
Emergency warning signs
- difficulty breathing
- chest pain
- confusion
- bluish lips or face
Evaluation & tests
Educational note: clinicians decide when testing is useful. This library does not diagnose.
Treatment education
Educational overview: rest and fluids help most people; care is individualized by clinicians. This library does not prescribe.
Self-care
General education: rest, fluids, and staying away from others can help recovery and reduce spread.
When to seek care
Seek care if you are in an at-risk group, or if symptoms are severe or do not improve.