Guidance

Influenza: the green book, chapter 19

Influenza immunisation information for public health professionals, including updates.

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Chapter 19 update patches

Influenza is an acute viral infection of the respiratory tract. There are three types of influenza virus: A, B and C. Influenza A and influenza B are responsible for most clinical illness. Influenza is highly infectious with a usual incubation period of one to three days.

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