H3N2 is a sub type of influenza virus that causes flu in both birds and mammals. In March 2023, cases of H3N2 started getting reported from India.
Influenza viruses, which cause the infectious disease known as flu, are of four different types: A, B, C and D.
Influenza A is further classified into different subtypes and one of them is H3N2.
According to the United States’ Centers for Disease Control and Prevention (CDC), H3N2 caused the 1968 flu pandemic that led to the death of around one million people globally and about 100,000 in the US.
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