Davies P R, Bahnson P B, Grass J J, Marsh W E, Garcia R, Melancon J, Dial G D
Department of Clinical and Population Sciences, College of Veterinary Medicine, St. Paul, MN 55108, USA.
Vet Parasitol. 1996 Mar;62(1-2):143-53. doi: 10.1016/0304-4017(95)00853-5.
We investigated the association between the presence of papular dermatitis and sarcoptic mite infestation in pigs slaughtered in southern Minnesota. Following dehairing, a sample of 30 pigs from each of 50 herds was inspected for papular dermatitis lesions. Herds were selected after being categorized into one of five categories according to the prevalence and severity of dermatitis lesions. Herd infestation with sarcoptic mange was determined by recovery of mites from ear scrapings of slaughtered pigs and also by survey of producer opinion. Mite infestation was detected in 28 herds (56%) and 215 of 1500 pigs (14%). Considerable variability in prevalence of positive scrapings, ranging from one pig (3%) to 19 pigs (63%), was found among infested herds. Prevalence of mite infestation was positively associated with severity of papular dermatitis lesions in groups. For individual pigs, estimates of the specificity of localized lesions ranged from 0.70 to 0.90. Generalized lesions appear highly specific (> 0.98) for sarcoptic mite hypersensitivity. Generalized lesions occurred in 36.7% of pigs from herds confirmed to be infested, compared with 0.4% of pigs in herds confirmed free from mange. Our date indicate that monitoring of dermatitis lesions in slaughtered pigs might be a useful test for sarcoptic mange in the Midwest, USA.
我们调查了明尼苏达州南部屠宰猪的丘疹性皮炎与疥螨感染之间的关联。脱毛后，对来自50个猪群中每个猪群的30头猪进行检查，查看是否有丘疹性皮炎病变。根据皮炎病变的患病率和严重程度将猪群分为五类后进行选择。通过从屠宰猪的耳部刮片中发现螨虫以及调查养殖户的意见来确定猪群是否感染疥螨。在28个猪群（56%）中检测到螨虫感染，1500头猪中有215头（14%）感染。在受感染的猪群中，阳性刮片的患病率差异很大，从1头猪（3%）到19头猪（63%）不等。螨感染的患病率与各组丘疹性皮炎病变的严重程度呈正相关。对于个体猪，局部病变的特异性估计值在0.70至0.90之间。全身性病变对疥螨超敏反应似乎具有高度特异性（>0.98）。在确认受感染猪群中，36.7%的猪出现全身性病变，而在确认无疥螨的猪群中，这一比例为0.4%。我们的数据表明，监测屠宰猪的皮炎病变可能是美国中西部地区检测疥螨感染的一种有用方法。
