But in August and September the proportion of children aged up to four with H1N1 antibodies rose to one fifth in London and the West Midlands. Almost half of children aged between five and 14 had antibodies, they said. Prof Miller wrote: “This finding is consistent with the high level of susceptibility in children and the increased potential for transmission that occurs within schools. We also showed substantial differences between regions in the extent of infection during the first wave. ‘ In a separate study it was found that because so many children were infected in the first wave that by the time the second wave hit, after the schools reopened in September, there was little impact the vaccine could make on the spread of the disease.
via Half of schoolchildren in some areas had swine flu: government scientists – Telegraph.