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重複爆發的豬流行性腹瀉病毒在印第安納的農場證實
日期:2014年5月29日
第二次爆發在農場駁斥的理論,發展豬免疫力,豬流行性腹瀉病毒感染後
豬流行性腹瀉 (PED)病毒已被證明更加難以遏制獸醫比早先的想法,一心印第安納州的農場證實PED病毒的第二次爆發。該農場不想被公開確認,但其授權的獸醫,馬特·阿克曼,發言代表其。
州和聯邦的努力,杜絕PED病毒已在一個假設,即豬,一旦感染,開發免疫力,不會被疾病再次在至少幾年折磨操作,根據路透社的 報導。同樣,忍受了疾病的農場不知道挨二次爆發。印第安納的農場是第一個公開確認重複爆發。
在印第安納情況下,基因測序顯示的PED病毒擊中豬的“精確一脈相承”的,並再次2014年3月在農場2013年5月,阿克曼說,誰收集的樣本從農場。出生仔豬母豬感染第二次有大約30%的死亡率,與初生仔豬最早爆發期間,近100%的死亡率相比,他說。
阿克曼不知道為什麼在印第安納的農場母豬被重新感染原爆發期間暴露於病毒後,去年。當時,他們大約半年到一年歲。母豬是有仔豬,並通過有限的免疫力給他們的後代,他說。阿克曼說,在農場做一個“環衛出色的工作,”使之更令人費解的是,以PED病毒的重複爆發怎麼可能發生。
原文:
Repeat PEDv outbreak confirmed at Indiana farm
Date: 2014-05-29
Second outbreak at farm disproves theory that pigs develop immunity to PEDv after infection
Porcine epidemic diarrhea (PED) virus has proven more difficult to contain than veterinarians earlier thought, as one Indiana farm confirmed a second outbreak of PED virus. The farm did not want to be publicly identified, but authorized its veterinarian, Matt Ackerman, to speak on its behalf.
The state and federal effort to stamp out PED virus had operated on an assumption that a pig, once infected, develops immunity and will not be afflicted by the disease again for at least a few years, according to a Reuters report. Likewise, farms that had endured the disease were not known to suffer secondary outbreaks. The Indiana farm is the first to publicly confirm a repeat outbreak.
In the Indiana case, genetic sequencing showed the "exact same strain" of PED virus hit pigs at the farm in May 2013 and again in March 2014, said Ackerman, who collected samples from the farm. Piglets born to sows that were infected for a second time have a death rate of about 30 percent, compared with a nearly 100 percent death rate among newborn piglets during the first outbreak, he said.
Ackerman did not know why the sows on the Indiana farm were re-infected after being exposed to the virus during the original outbreak last year. At the time, they were about six months to a year old. The sows are having piglets and passing limited immunity on to their offspring, he said. Ackerman added that the farm does an “excellent job of sanitation,” making it more puzzling as to how a repeat outbreak of PED virus could occur.
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