A month ago, Britain’s Health Secretary Andy Burnham issued a statement urging British citizens not to panic despite a surge in cases of H1N1 influenza virus in the country. Now it seems health officials have the opposite problem, and are urging parents not to hold “swine flu parties” which some people believe will build up children’s immunity by infecting them with the virus. Parents in Britain have long held “chicken pox parties” at the beginning of summer so that children can catch the disease at a convenient time