Influenza A virus subtype H2N2
Influenza A virus subtype H2N2 (H2N2) is a subtype of the Influenza A virus. Also known as Asian Flu, it originated from an avian influenza virus and was responsible for the 1957–1958 influenza pandemic.
Origin
The H2N2 subtype was first identified in 1957 in East Asia. It is believed to have evolved from a recombination of the Influenza A virus subtype H1N1 and an avian influenza virus. The H2N2 subtype has not been detected in humans since 1968, but it continues to circulate in bird populations.
Epidemiology
The H2N2 subtype caused an estimated one to two million deaths globally during the 1957–1958 pandemic, with high mortality rates among the elderly. The virus was able to spread rapidly due to the lack of immunity in the human population.
Symptoms
The symptoms of H2N2 infection are similar to those of other influenza viruses and can include fever, cough, sore throat, body aches, headache, chills, and fatigue. Severe infections can lead to pneumonia and other complications.
Prevention and Treatment
Vaccination is the most effective way to prevent infection with the H2N2 subtype. Antiviral drugs such as oseltamivir and zanamivir can be used to treat infection.
See Also
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| Infectious diseases – viral systemic diseases | ||||||||||
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| Pandemics | ||||||||
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Contributors: Prab R. Tumpati, MD
