Influenza A virus, subtype H3N2 virus, is a strain of the influenza virus that causes respiratory illness in humans. It is one of the most common strains of the influenza virus that circulates during the flu season. Kolkata, formerly known as Calcutta, is a city in eastern India. Like many other parts of the world, Kolkata experiences seasonal flu outbreaks, which can be caused by a variety of influenza viruses, including H3N2. Symptoms of H3N2 influenza virus infection are similar to those of other strains of the flu and can include fever, cough, sore throat, body aches, and fatigue. The flu is primarily spread through respiratory droplets that are released when an infected person talks, coughs, or sneezes.
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