History of Swine Flu OutbreaksEpidemics in 1918, 1976 and 2007Apr 27, 2009 Rosemary E. Bachelor
The present Swine Flu outbreak is partially rooted in history, with large influenza epidemics in 1918, 1976 and earlier.
Swine flu is a carefully watched type of influenza because pigs vary from most recipients, carriers and transmitters of contagious flu strains. Unlike most animals, they can contract human and avian borne influenza, recombine it and then transmit it in a new, more dangerous and more treatment-resistant form. Flu is always being passed around the human population, but rarely has it reached threatening epidemic proportions. The 1918 Influenza EpidemicCalled the “Spanish” influenza strain, and classified as pandemic, during 1918 and 1919 it is thought to have infected a third of the world population and caused perhaps as many as 50 million deaths, according to the U.S. Center for Disease Control, which must have been figuratively holding its breath when it admitted deaths could have been nearly double that because many who died during that period were not actually diagnosed, nor were samples taken for lab testing and identification. In 1918, causes of human flu and its links to avian and swine influenza were not known. Ancestral and Descendant Flu StrainsConsider this: “All influenza A pandemics since that time, and indeed almost all cases of influenza A worldwide (excepting human infections from avian viruses), have been caused by descendants of the 1918 virus.” (Taubenberger and Morens) That 91-year-old virus wasn’t killed. It survives as the “ancestor” of the deadly descendants being grappled with today. Indeed, research in the 1930s found its offspring in both pigs and humans and concluded it was related to widespread flu epidemics in 1847 and 1889. The 1976 Influenza EpidemicIn 1976, an Army recruit at Fort Dix, NJ, complained of feeling tired and weak. He died the next day (Feb. 5) and four other soldiers were soon hospitalized. Health officials attributed the death to swine flu and said the current flu strain was closely related to that of the 1918 epidemic. Public health officials panicked and urged President Gerald Ford to act. About 24% of the U. S. population was vaccinated. The largest casualty, however, was approximately 500 cases of Guillain-Barré syndrome tied to an immunopathological reaction to the vaccine. There were 25 associated deaths from severe pulmonary complications. The Present Swine Flu ThreatThere was an outbreak of swine flu in the Philippines in 2007. The National Meat Inspection Service there raised a hog cholera red alert warning for the Manila region, then for five regions of Luzon after the disease spread to backyard pig farms. The strain involved in the present 2009 outbreak involves a virus similar to that found in U.S. pigs since 1999, but there are also resemblances to versions present in European swine. One theory believes Asian and European strains traveled to Mexico in migratory birds, or in people, then combined with North American strains in Mexican pig factory farms before being transmitted to Mexican farm workers. It’s hard to believe but, according to an April 22 statement by the U.S. Center for Disease Control, there is no national surveillance system in place to determine what viruses are circulating in U.S. pigs. Check here for an update on the current swine flu. Companion articles list resources for dealing with swine flu, including making a personal plan in case someone in close contact is diagnosed with swine flu, and common questions, with answers, about the current swine flu epidemic. Sources: Taubenberger, J.K, and Morens, David M., 1918 Influenza: the Mother of all Pandemics (See this article at CDC website) Kirby, David, Swine Flu Outbreak – Nature Biting Back at Industrial Animal Production?, The Huffington Post, 26 April 2009
The copyright of the article History of Swine Flu Outbreaks in General Medicine is owned by Rosemary E. Bachelor. Permission to republish History of Swine Flu Outbreaks in print or online must be granted by the author in writing.
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