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http://savannahnow.com/news/2011-07-06/west-nile-detected-chatham-county#.ThWTP2HbNyU
West Nile detected in Chatham County
Posted: July 6, 2011 - 12:30am
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By Mary Landers
[snip]
Birds, including sentinel chickens, are no longer used to monitor for West Nile, Lewandowski said. They just don't get sick quickly enough.
"We learned that in 2003," he said, "when we were getting human cases before birds."
[snip]