Seasonal Influenza is caused by a number of circulating Influenza viruses such as Influenza A which includes H1N1, H3N2, H2N2, Influenza B etc. Type A viruses cause greatest morbidity and mortality.
Infants, young children, pregnant women and elderly above the age of 65 are at higher risk of acquiring influenza.
Monsoon is the usual seasonality for large parts of India. In north, north-west and Central India, the surge in cases usually occurs in winter months (January to March)
Incubation period is 1- 4 days. Infected adults usually shed virus for 4-6 days. However, children and Immuno-suppressed patients can shedthe virusfor months
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