Thetotal number of farms that have tested positive for the Porcine EpidemicDiarrhoea (PED)
virus now stands at 4,458, writes Jackie Linden.
TheNational Animal Health Laboratory Network (NAHLN) reports 274 new cases thisweek .
The Service has modified some earlier totals, bringing the grand totalof positive accessions to 4,458.
近日，美国接受过PED（流行性腹泻）疫情的农场总数达到了4千4百58家。
美国国家动物健康网络报告显示，本周该国新增的流行性腹泻病例274例，近日，相关部门也更改了早期的一些统计数据，并将接受检疫的农场提高到了4458家。
