date:May 21, 2013
aire out to swine veterinarians in the coming days, to try to determine how the virus was introduced into the nation's pork production chain and see how it spread, Becton said.
Swine veterinarians across the U.S. are collecting samples from pork farms that have reported possible cases and sending them in for testing at National Veterinary Service Laboratories and other sites.
Some veterinarians are also sending in samples of animal feed for testing, to see whether the virus was spread that way