亚洲最大福利网站_4hu四虎永久网址_麻豆国产原创_国产成人av一区二区

Outbreak of deadly piglet virus spreads to 13 U.S. states
date:Jun 20, 2013
diagnostic labs have since discovered that PEDV arrived as early as April 16, according to the American Association of Swine Veterinarians. The labs have begun testing older samples taken from seemingly unrelated cases in an effort to track the virus' first appearance in the U.S.

Investigators with the U.S. Agriculture Department and others are hunting for clues to the widening outbreak and focusing on the nation's livestock transportation system.

PEDV is spread most commonly by pigs ingesting

12/21 15:13