The Department of Agriculture, Livestock and Environment of Spain’s Aragon region said in a statement on Thursday that it had ordered the slaughter of the 92,700 mink after seven workers on the farm tested positive for Covid-19 and the animals were found to be infected with the coronavirus.
As a precaution the department shut down the farm, in Teruel, eastern Spain, on May 22, for monitoring before conducting a number of tests at random, which initially returned a negative result.
However, subsequent tests, the most recent of which was July 7, confirmed 78 out of 90 animals tested — equivalent to 87% of the sample — had become infected with the coronavirus.
In the statement, the department said no conclusions could be drawn as to whether “there is human-to-animal transmission or vice versa,” and that “no abnormal behavior has been detected in the animals nor has there been an increase in mortality in them.”
However, it said all mink on the farm would be slaughtered as a preventative measure.
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The testing has led to the culling of up to one million mink in the country at two dozen farms, according to animal welfare charity Humane Society International.
“On the basis of new research results from the ongoing research into Covid-19 infections at mink farms, it is plausible that an infection took place from mink to human,” the Dutch government said in a statement at the time. “It also appears from this research that minks can have Covid-19 without displaying symptoms.”
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