Is it possible to catch swine flu twice?

Yes, because the virus can mutate (change). If you become infected with the swine flu virus, your body produces antibodies against it, which will recognise and fight off the virus if the body ever encounters it again. However, if the virus mutates, your immune system may not recognise this different strain and you may become ill again, although you may have some 'cross protection' due to encountering a similar virus previously.

Further information:

• Flu symptom checker
• News: swine flu latest
• Swine flu

Go to Directgov for essential cross-government information on swine flu, including latest advice on travel, schools and other public services.