Human influenza A/B (HI.A/B) is a respiratory infection of upper and lower respiratory tract in infants and young children. It causes bronchiolitis and pneumonia.

Influenza is a negative-sense, enveloped RNA virus. Its morphology is spherical or filamentous with a diameter of 80 to 120 nm. Its most severe symptoms are associated with influenza A viruses. Many sub-types of influenza A viruses are known and classified according to the origin of the hemagglutinin and neuraminidase. Influenza B viruses are antigenically more stable than influenza A. This explains that they cause less severe epidemics.

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