Austrian cows could get virus diarrhea with vaccines in Kazakhstan 13 февраля 2013, 15:15
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Austrian Agency for Health and Food Safety (AGES) insists that the cows exported to Kazakhstan were infected with virus diarrhea after they left Austria, Tengrinews.kz reports citing the Agency’s message.
Earlier Tengrinews.kz English reported that over 700 elite Simmental cows purchased in Austria would be exterminated in Poltavskoye and Leonov farms in North-Kazakhstan oblast. The reason for extermination lays in alleged Schmallenberg virus and virus diarrhea. 722 animals were exported in the period from August 23 to September 27, 2012.
In this relation the Austrian party made several checks in the National Reference Laboratory in Modling (Austria), BVDV (virus diarrhea) Reference Laboratory in Weybridge (Great Britain) and Friedrich Loeffler Institute (Germany). Besides, test were jointly made in the National Reference Laboratory in Astana.
First of all, the cows were checked during quarantine before their dispatch from Austria. According to the veterinary certificate for export of cattle to the Customs Union, such animals are tested for virus diarrhea and antibodies against it. Tests of the samples taken from all 722 cows showed negative results. After the complaint from Kazakhstan party all blood samples stored in AGES were tested in Modling for the second time. However, the tests showed no virus diarrhea again.
Then Austrian experts arrived in Poltavskoye and Leonov farms in North-Kazakhstan oblast. Along with Kazakhstan experts, they took the samples from the animals that Kazakhstan laboratory confirmed to have the virus diarrhea. Besides, the samples were taken from 20 cows with no confirmed virus diarrhea and 20 calves born from the Austrian cows. In total, the samples were taken from 264 adult cows and 20 calves.
As a result, a positive reaction on one of the types of virus diarrhea, BVDV-Ab, was discovered in three adult cows in Poltavskote farm and 98 cows in Leonov farm. Similar results were received in the British laboratory. Thus, circulation of the virus diarrhea was not confirmed.
Selection of cows for analysis was made based on the test that was earlier made in the Kazakhstan laboratory. However, the virus was not confirmed in the animals that were believed sick before, but was discovered in the cows that were selected as healthy.
“We have to stress that the animals selected by Kazakhstan Agriculture Vice-Minister Gulmira Issayeva for the second test and earlier confirmed to be BVDV-Ab-negative, turned out to be BVDV-Ab-positive in the joint research (Kazakhstan, Austria and Great Britain),” the Austrian agency stated casting discredit on the initial results of the tests made in the Kazakhstan laboratories.
The Austrian authority does not also preclude that the cows were infected with virus diarrhea or vaccinated against it after dispatch from Austria. Vaccines against BVDV contain the IBR virus. These vaccines are prohibited in Austria. Besides, the tests of the blood samples taken from cows prior to their dispatch did not show any IBR virus. However, this virus was discovered in most of the samples taken from the same cows in Leonov farm.
“Probably, the cows were vaccinated with mixed vaccines after their dispatch from Austria. The tests show that the animals’ immunity faced the infectious and vaccine agents not long before the sampling in Kazakhstan in the period from December 11 to 17, 2012,” the Austrian agency said.
Besides, Kazakhstan experts took blood samples from 10 animals in 29 Austrian cattle-breeding companies in January 2013. Blood samples were tested in Austria, Germany and Kazakhstan. As a result, antibodies of SBV-Ag, or Schmallenberg virus antibodies, were discovered in 268 blood samples in Austria and 267 samples in Germany.
The results comply with what AGES had already stated in its analysis of Schmallenberg virus in Austria. “This information was passed by the Federal Health Ministry to international organizations and foreign authorities, including the Kazakhstan ones,” the agency explained.