A new influenza vaccine is produced each year because the virus changes over time. So people need their 'flu shots' every year. What is included in them is based on scientists' calculations about which virus types will circulate that year. You are protected from about 2 weeks after receiving the vaccination.

Attribution: Avallain

See also:

• Who can't have flu vaccine
• Prevention
• Influenza

Frequently Asked Questions

• If I have systemic lupus erythematosus, do I need to have vaccines against other diseases?
• Is there a vaccine against pneumococcal meningitis?
• If I have systemic lupus erythematosus, do I need to have vaccines against other diseases?
• Is there a vaccine against pneumococcal meningitis?
• Am I more likely to get infections if I have coeliac disease?