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Protocol

A standard protocol is shared between sites allowing comparison and pooling of results between sites. This is a multi-centre, prospective, active surveillance, hospital-based epidemiological study.

 

Patients hospitalized during the flu season
are asked for recent influenza-like-illness (ILI) symptoms:

diagrama protocol

When vaccine coverage is sufficient, vaccine effectiveness is assessed using a test negative design (comparison of vaccine coverage between laboratory confirmed cases of influenza and controls).

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