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Swine
flu Reports
Old seasonal flu antibodies may be active against swine flu virus London:
Scientists at the Centers for Disease Control and Prevention (CDC) in Atlanta
say that antibodies against some seasonal flu strains from prior years may provide
an effective weapon to fight the new H1N1 swine flu. Anne Schuchat, interim deputy
director for the Science and Public Health Program at the CDC, has revealed that
this proposition is based on the findings of a recent study, which also suggests
an explanation for why swine flu appears to infect the young more often than the
elderly, who are normally more susceptible to seasonal flu viruses. During the
study, the researchers analysed blood samples taken from 359 participants in flu
vaccine studies conducted from 2005 to 2009. According to the research group,
33 per cent of the samples from people over 60 years old had antibodies that reacted
with the swine flu virus, as compared to 6-9 per cent of the samples from people
aged 18-64 years, and none of the samples taken from children 1. Schuchat said
that the results matched the apparent current epidemiology of swine flu infection:
most cases of swine flu have occurred in people who are under 60 years old, and
only one per cent of confirmed swine flu infections in the US were in patients
over the age of 65. The researcher, however, concedes that the findings should
be interpreted with caution, because though the antibodies have been found to
react with the virus in test-tube assays, studies have not yet shown that the
antibodies can fend off the virus in animals or people. "Whether this particular
assay will pan out over time as predictive of clinical protection, we can't say,"
Nature magazine quoted Schuchat as saying. The study has been published in the
Morbidity and Mortality Weekly Report. -May
22, 2009 Go
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