Volume 5, Number 2—April 1999
The Next Influenza Pandemic: Lessons from Hong Kong, 1997
|Year||Colloquial Name (Subtype)||Source||Impact|
|1918 (1)||Spanish flu (H1N1 viruses like swine flu)||Possible emergence from swine or an avian host of a mutated H1N1 virus||Pandemic with >20 million deaths globally|
|1957 (2)||Asian flu (H2N2)||Possible mixed infection of an animal with human H1N1and avian H2N2 virus strains in Asia||Pandemic, H1N1virus disappeared|
|1968 (2)||Hong Kong flu (H3N2)||High probability of mixed infection of an animal with human H2N2 and avian H3Nx virus strains in Asia||Pandemic, H2N2 virus disappeared|
|1977 (3)||Russian flu (H1N1)||Source unknown but virus is almost identical to human epidemic strains from 1950. Reappearance detected at almost the same time in China and Siberia||Benign pandemic, primarily involving persons born after the 1950s. H1N1 virus has cocirculated with H3N2 virus in humans since 1977|
|Incidents with limited spread|
|1976 (4)||Swine flu (H1N1)||United States/New Jersey. Virus enzootic in U.S. swine herds since at least 1930||Localized outbreak in military training camp, with one death|
|1986 (5)||(H1N1)||The Netherlands. Swine virus derived from avian source||One adult with severe pneumonia|
|1988 (6)||Swine flu (H1N1)||United States/Wisconsin. Swine virus||Pregnant woman died after exposure to sick pig|
|1993 (7)||(H3N2)||The Netherlands. Swine reassortant between old human H3N2 (1973/75-like) and avian H1N1||Two children with mild disease. Fathers suspected to have transmitted the virus to the children after having been infected by pigs.|
|1995 (8)||(H7N7)||United Kingdom Duck virus||One adult with conjunctivitis|
|1997 (9)||Chicken flu (H5N1)||Hong Kong Poultry virus||18 confirmed human case, 6 deaths|
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