"ව්යාප්ත වසංගත" හි සංශෝධන අතර වෙනස්කම්
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=== Yellow fever ===
[[Yellow fever]] has been a source of several devastating epidemics.<ref>[http://www.1911encyclopedia.org/Yellow_Fever Yellow Fever - LoveToKnow 1911].</ref> Cities as far north as New York, Philadelphia, and Boston were hit with epidemics. In 1793, the largest [[Yellow Fever Epidemic of 1793|yellow fever epidemic]] in U.S. history killed as many as
5,000 people in Philadelphia—roughly 10% of the population.<ref>{{cite web | last=Arnebeck | first=Bob | title=A Short History of Yellow Fever in the US | work=Benjamin Rush, Yellow Fever and the Birth of Modern Medicine | date=January 30, 2008 | url=http://www.geocities.com/bobarnebeck/history.html | accessdate=04-12-2008 |archiveurl=http://web.archive.org/web/20021029000834/http://www.geocities.com/bobarnebeck/history.html|archivedate=October 29, 2002}}</ref> About half of the residents had fled the city, including President George Washington. Approximately 300,000 people are believed to have died from yellow fever in [[ස්පාඤ්ඤය]] during the 19th century.<ref>[http://www.iberianature.com/material/tigermosquito.htm Tiger mosquitoes and the history of yellow fever and dengue in Spain].</ref> In colonial times, West Africa became known as "the white man's grave" because of malaria and yellow fever.<ref>[http://www.nytimes.com/1995/10/15/weekinreview/the-world-africa-s-nations-start-to-be-theirbrothers-keepers.html Africa's Nations Start to Be TheirBrothers' Keepers]. The New York Times, October 15, 1995.</ref>
=== Unknown causes ===
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