Sentinel chickens

“In May 2000 Canadian Health authorities stationed cages of sentinel chickens along 2500 km (1550 miles) of the border with the United States in an effort to identify the presence of West Nile virus in susceptible animals before the disease was detected in humans in Canada. Ultimately, the sentinel chickens were key in detecting a new viral epidemic.”

Source here. And then there are “Super Sentinel” Chickens

March

07

2011

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