There are three types of influenza or flu, namely A, B, C. Among the three types, type A is the most dangerous. There is a strong belief that Type A has been responsible for many global outbreaks like in 1918, 1957, 1968, etc. In addition to these types, the viruses have been classified based on the place and year of discovery of the strain, type of HA, NA proteins, lab identification number, etc.

The first influenza virus was discovered in 1930s. Scientists have categorized those viruses from that time into three main types, as already mentioned, depending on the composition of proteins they possess.

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