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Influenza A virus subtype H2N2
H2N2 is a subtype of the influenza A virus. H2N2 has mutated into various strains including the Asian flu strain (now extinct in the wild), H3N2, and various strains found in birds. It is also suspected of causing a human pandemic in 1889.〔 (Sdstate.edu )〕〔 (Pilva.com )〕
The geographic spreading of the 1889 Russian flu have been studied and published.
==Russian flu==
Some researchers have asserted that the 1889–1890 flu pandemic (also known as Russian flu) was caused by the influenzavirus A virus subtype H2N2. More recent research has suggested H3N8 as a more likely cause. It is the earliest flu pandemic for which detailed records are available. "The 1889 pandemic, known as the Russian Flu, began in Russia and spread rapidly throughout Europe. It reached North America in December 1889 and spread to Latin America and Asia in February 1890. About 1 million people died in this pandemic."〔 (CIDRAP ) article ''Pandemic Influenza'' Last updated 16 Jun 2011〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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