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Abstract of August 2007 Water Research article, "Impact of bathers on levels of Cryptosporidium parvum oocysts and Giardia lamblia cysts in recreational beach waters":

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V73-4NR187Y-2&_user=10&_coverDate=08%2F31%2F2007&_alid=603474406&_rdoc=1&_fmt=summary&_orig=search&_cdi=5831&_sort=d&_docanchor=&view=c&_ct=1&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=c0e9f6f432d389b7eabf571c8b99d484

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