1918 Pandemic (H1N1 virus)

[custom_adv]


With the appearance of a new H2N2 pandemic strain in 1957 (“Asian flu”), the direct H1N1 viral descendants of the 1918 pandemic strain disappeared from human circulation entirely, although the related lineage persisted enzootically in pigs. But in 1977, human H1N1 viruses suddenly “reemerged” from a laboratory freezer (9). They continue to circulate endemically and epidemically.

Check Also

Pictures of Persepolis club legend Hossein Kalani

Hossein Kalani: The Scholar Striker of Iranian Football Hossein Kalani (born 25 February 1944) is …