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Chicken are pictured lock in a poultry farm in Bergentheim November 10, 2016 following the discovery of bird flu among wild birds in Europe. Poultry farmers in The Netherlands have been ordered to lock up their flocks, after a dangerous variant of the bird flu (H5N8 strain) is spreading across Germany and other European countries. According to the state of Schleswig-Holstein, dead wild birds were also reported at Lake Constance in Baden-Wuerttemberg, Switzerland and Austria. / AFP / ANP / Vincent Jannink / Netherlands OUT (Photo credit should read VINCENT JANNINK/AFP/Getty Images)

Chicken are pictured lock in a poultry farm in Bergentheim November 10, 2016 following the discovery of bird flu among wild birds in Europe. Poultry farmers in The Netherlands have been ordered to lock up their flocks, after a dangerous variant of the bird flu (H5N8 strain) is spreading across Germany and other European countries. According to the state of Schleswig-Holstein, dead wild birds were also reported at Lake Constance in Baden-Wuerttemberg, Switzerland and Austria. / AFP / ANP / Vincent Jannink / Netherlands OUT (Photo credit should read VINCENT JANNINK/AFP/Getty Images)
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STRADBROKE, UNITED KINGDOM - NOVEMBER 14: Turkeys roost indoors on a Suffolk Farm on November 14, 2007 in Stradbroke, England. A confirmed outbreak of the H5N1 strain of bird flu has been found on the Redgrave Park Farm in Redgrave, near Diss in Suffolk. A 3km protection zone and a 10km surveillance zone has been established around the infected premises. Following further tests, DEFRA has announced at a press conference that this particular virus does contain the highly infectious H5N1 substrain of Aviation Influenza (the fourth outbreak H5N1 in the UK this year), which in rare cases can spread to other species, including humans. (Photo by Jamie McDonald/Getty Images)

STRADBROKE, UNITED KINGDOM - NOVEMBER 14: Turkeys roost indoors on a Suffolk Farm on November 14, 2007 in Stradbroke, England. A confirmed outbreak of the H5N1 strain of bird flu has been found on the Redgrave Park Farm in Redgrave, near Diss in Suffolk. A 3km protection zone and a 10km surveillance zone has been established around the infected premises. Following further tests, DEFRA has announced at a press conference that this particular virus does contain the highly infectious H5N1 substrain of Aviation Influenza (the fourth outbreak H5N1 in the UK this year), which in rare cases can spread to other species, including humans. (Photo by Jamie McDonald/Getty Images)
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BANBURY, UNITED KINGDOM - JUNE 04: A sign warns of a outbreak of the H7 strain of bird flu at Eastwood Farm, near Banbury on June 4 2008 in Oxfordshire, England. The strain of avian flu virus was found yesterday in laying hens, and all birds on the farm have been ordered to be destroyed. The H7 strain has been found in Britain on several occasions before, but this is the first time it has been identified in the highly pathogenic, or deadly, form. (Photo by Matt Cardy/Getty Images)

BANBURY, UNITED KINGDOM - JUNE 04: A sign warns of a outbreak of the H7 strain of bird flu at Eastwood Farm, near Banbury on June 4 2008 in Oxfordshire, England. The strain of avian flu virus was found yesterday in laying hens, and all birds on the farm have been ordered to be destroyed. The H7 strain has been found in Britain on several occasions before, but this is the first time it has been identified in the highly pathogenic, or deadly, form. (Photo by Matt Cardy/Getty Images)
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Getty Images News Matt Cardy

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ROSTOCK, GERMANY - NOVEMBER 28: Pathologist Sascha Gerst at the state agriculture agency in Mecklenburg-Western Pomerania (Landesamt fuer Landwirtschaft, Lebensmittelsicherheit und Fischerei Mecklenburg-Vorpommern) takes samples from the carcass of a wild duck at the agency lab to test for bird flu on November 28, 2014 in Rostock, Germany. Northern Europe is on high alert after cases of the H5N8 bird flu virus were confirmed in wild fowl and also at poultry farms in Germany, the Netherlands and the United Kingdom, and tens of thousands of animals have already been killed by authorities in an effort to stem the virus from spreading. Authorities believe the virus arrived with migrating birds from Asia. (Photo by Carsten Koall/Getty Images)

ROSTOCK, GERMANY - NOVEMBER 28: Pathologist Sascha Gerst at the state agriculture agency in Mecklenburg-Western Pomerania (Landesamt fuer Landwirtschaft, Lebensmittelsicherheit und Fischerei Mecklenburg-Vorpommern) takes samples from the carcass of a wild duck at the agency lab to test for bird flu on November 28, 2014 in Rostock, Germany. Northern Europe is on high alert after cases of the H5N8 bird flu virus were confirmed in wild fowl and also at poultry farms in Germany, the Netherlands and the United Kingdom, and tens of thousands of animals have already been killed by authorities in an effort to stem the virus from spreading. Authorities believe the virus arrived with migrating birds from Asia. (Photo by Carsten Koall/Getty Images)
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ABERDEEN, UNITED KINGDOM - APRIL 09: Douglas Gray, Centre Manager of the Scottish Agricultural College SAC, Veterinary Services, inspects a dead Mallard duck at a laboratory on April 9, 2006 in Aberdeen, Scotland. Laboratories are testing dead birds after a swan was found with the H5N1 avian flu virus in the village of Cellardyke in Fife. (Photo by Jeff J Mitchell/Getty Images)

ABERDEEN, UNITED KINGDOM - APRIL 09: Douglas Gray, Centre Manager of the Scottish Agricultural College SAC, Veterinary Services, inspects a dead Mallard duck at a laboratory on April 9, 2006 in Aberdeen, Scotland. Laboratories are testing dead birds after a swan was found with the H5N1 avian flu virus in the village of Cellardyke in Fife. (Photo by Jeff J Mitchell/Getty Images)
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Getty Images News Jeff J Mitchell