122243 - Immunise against influenza in the community
- : Online
A Category 2, 1hour online case study based program on Immunising against influenza in the communityRelevance to General Practice
The three major types of influenza viruses (A, B, and C) are differentiated by their surface proteins.2 Influenza A and B are the main causes of illness in humans, and are therefore the only two strains included in the seasonal influenza vaccine.
Influenza A viruses are further divided into subtypes based on the two types of surface antigens: haemagglutinin (H) which facilitates cell attachment during infection, and neuraminidase (N), which helps virus leave the cell. In humans, the subtypes of H are 1,2, and 3; and those of N are 1 and 2. Infections with influenza A (H3N2) are usually more serious than those with influenza B or seasonal influenza A (H1N1).
In adults, the onset of illness often occurs suddenly. Common symptoms include fever, dry non-productive cough, nasal congestion, headache, sore throat, malaise, fatigue, anorexia and myalgia. Symptoms may range from mild to severe, and since symptoms are non-specific, many influenza cases are undiagnosed.