Flu virus passed on before symptoms show

A study from Imperial College London has suggested that the influenza virus can be passed on before the appearance of any symptoms.

The research team carried out a small study, published in the journal PLoS ONE and using the 2009 swine flu pandemic strain, of the virus transmission in ferrets but suggest that if the finding applies to humans it means that people pass on the virus to others before they know they are infected, which makes it difficult to contain the spread of the infection.

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