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| Beach advisory ： ウィキペディア英語版 |
Beach advisory
A beach advisory is a warning given by a local government to avoid swimming in a body of water. Beach advisories do not automatically close bodies of water to swimmers but instead function as a warning to swimmers against swimmining at a particular site.
Beach advisories are issued after unsafe levels of Enterococcus are detected at sample sites along a body of water, often resulting from high levels of fecal matter in the water.〔 One source of waste pollution and subsequent increase in enteroccus concentration may come from migrating birds. Enterococcus bacteria is not harmful by itself, but it indicates harmful bacteria is in the water. These types of bacteria can cause gastrointestinal illnesses, resulting in vomiting and diarrhea.〔〔 They may also cause upper respiratory illness as well as skin infections at an open wound.〔
Beach advisories are also issued after chemical spills. Beach advisories are often issued after rain advisories because high amounts of rain can can cause contaminated streamflow from flooding to enter a body of water and contaminate the swimming area.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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