Gast R K, Beard C W
United States Department of Agriculture, Southeast Poultry Research Laboratory, Athens, Georgia 30605.
Avian Dis. 1990 Apr-Jun;34(2):438-46.
Laying hens of three different ages were experimentally infected with a strain of Salmonella enteritidis by either oral inoculation or contact transmission. Total egg production was depressed in exposed hens of all three age groups. Persistent intestinal shedding was observed in a small number of hens. Eggs with contents contaminated by S. enteritidis were produced by exposed hens at a high frequency, but only during a fairly short period of time that extended through approximately 1 week postinoculation for older hens and through 2 weeks for younger hens. S. enteritidis was recovered from whole yolks and albumen of these eggs at similar frequencies, but not from the content of yolks. Eggs with contaminated shells were also produced, but at a lower frequency. Contaminated eggs were produced by orally inoculated and contact-exposed hens at similar frequencies. S. enteritidis was not isolated from the contents of eggs laid by hens infected with other S. enteritidis strains.
对三种不同年龄的蛋鸡通过口服接种或接触传播的方式进行肠炎沙门氏菌菌株的实验性感染。所有三个年龄组的受感染蛋鸡的总产蛋量均下降。在少数蛋鸡中观察到持续性肠道排菌。受感染蛋鸡产出的蛋内容物被肠炎沙门氏菌污染的频率很高，但仅在相当短的一段时间内出现，对于老龄蛋鸡，这段时间持续到接种后约1周，对于幼龄蛋鸡则持续到2周。从这些蛋的全蛋黄和蛋清中以相似的频率分离出肠炎沙门氏菌，但未从蛋黄内容物中分离出。也产出了蛋壳被污染的蛋，但频率较低。口服接种和接触感染的蛋鸡产出受污染蛋的频率相似。未从感染其他肠炎沙门氏菌菌株的蛋鸡所产蛋的内容物中分离出肠炎沙门氏菌。
