Children in Suining, Sichuan province, China have their temperature taken to check for symptoms of H1N1 influenza. An unexpected degree of immunity to the virus has developed. (Image: View China Photo/Rex Features)
VACCINATING people against swine flu may be a lot easier than anyone dared hope, as it turns out that people have an unexpected degree of immunity to the pandemic now sweeping the world.
A seasonal flu in the same H1N1 family as the pandemic virus has been circulating since 1977, but until now it was thought that this seasonal virus did not induce immunity to the pandemic…
