asymptomatic

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Most Flu Is Asymptomatic

On average, roughly 20% of the unvaccinated had serologic evidence of influenza infection, but up to three quarters of the infected were asymptomatic. The proportions did not vary significantly between seasonal and pandemic influenzas. The pandemic H1N1 strain was associated with less severe symptoms than the seasonal H3N2 strain.

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Three-quarters of people with flu have no symptoms

“‘77% of flu infections’ have no symptoms, say experts,” reports ITV News.

The study was part of Flu Watch – a larger, ongoing study to assess the impact of flu on public health in England – and analysed five groups of people over six periods of influenza transmission, between 2006 and 2011.

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