Venezuelan equine encephalitis virus infection of cotton rats.

Venezuelan equine encephalitis virus infection of cotton rats.
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DOI:
10.3201/eid1308.061157
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发表时间:
2007-08
影响因子:
11.8
通讯作者:
Weaver SC
Weaver SC
中科院分区:
医学2区
文献类型:
--
作者:
Carrara AS;Coffey LL;Aguilar PV;Moncayo AC;Da Rosa AP;Nunes MR;Tesh RB;Weaver SC

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VEEV杀死了2个异地种群的棉鼠,但没有杀死来自佛罗里达的同域种群。委内瑞拉马脑炎病毒(Venezuelanequineencephalitis virus,VEEV)是一种新发现的马和人类病原体,但其啮齿类宿主感染的研究较少。为了确定不同地理种群对感染的反应是否不同,我们用2种地方性VEEV毒株(Co 97 -0054 [地方性ID亚型]和68 U201 [地方性IE亚型])接种3个棉鼠种群。这3个种群分别是在美国南佛罗里达VEE流行区采集的野生捕获棉鼠的后代;来自美国德克萨斯州非VEE流行区的野生捕获棉鼠;以及来自非VEE流行区的市售(哈兰)群体饲养棉鼠。尽管每个种群的早期病毒血症滴度相似,但在VEE同域分布的佛罗里达动物中未发现可检测到的疾病,但严重疾病和死亡影响了德克萨斯州和哈兰动物。我们的研究结果表明,棉鼠的地理来源是VEE感染的结果和这些啮齿动物的水库潜力的重要决定因素。
VEEV killed 2 allopatric populations of cotton rats but not a sympatric population from Florida. Venezuelan equine encephalitis virus (VEEV) is an emerging pathogen of equids and humans, but infection of its rodent reservoir hosts has received little study. To determine whether responses to infection vary among geographic populations, we inoculated 3 populations of cotton rats with 2 enzootic VEEV strains (Co97-0054 [enzootic ID subtype] and 68U201 [enzootic IE subtype]). The 3 populations were offspring from wild-caught cotton rats collected in a VEE-enzootic area of south Florida, USA; wild-caught cotton rats from a non–VEE-enzootic area of Texas, USA; and commercially available (Harlan) colony-reared cotton rats from a non–VEE-enzootic region. Although each population had similar early viremia titers, no detectable disease developed in the VEE-sympatric Florida animals, but severe disease and death affected the Texas and Harlan animals. Our findings suggest that the geographic origins of cotton rats are important determinants of the outcome of VEE infection and reservoir potential of these rodents.
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