Humphrey T J, Whitehead A, Gawler A H, Henley A, Rowe B
Public Health Laboratory, Exeter, UK.
Epidemiol Infect. 1991 Jun;106(3):489-96. doi: 10.1017/s0950268800067546.
Over 5700 hens eggs from 15 flocks naturally infected with Salmonella enteritidis were examined individually for the presence of the organism in either egg contents or on shells. Thirty-two eggs (0.6%) were positive in the contents. In the majority, levels of contamination were low. Three eggs, however, were found to contain many thousands of cells. In eggs where it was possible to identify the site of contamination, the albumen was more frequently positive than the yolk. Storage at room temperature had no significant effect on the prevalence of salmonella-positive eggs but those held for more than 21 days were more likely (P less than 0.01) to be heavily contaminated. In batches of eggs where both shells and contents were examined, 1.1% were positive on the former site and 0.9% in the latter.
对来自15个自然感染肠炎沙门氏菌鸡群的5700多个鸡蛋进行了逐个检查，以确定蛋液或蛋壳上是否存在该病菌。32个鸡蛋（0.6%）的蛋液呈阳性。大多数情况下，污染水平较低。然而，有3个鸡蛋被发现含有数以千计的病菌细胞。在能够确定污染部位的鸡蛋中，蛋白比蛋黄更常呈阳性。室温储存对沙门氏菌阳性鸡蛋的患病率没有显著影响，但保存超过21天的鸡蛋更有可能（P小于0.01）受到严重污染。在对蛋壳和蛋液都进行检查的批次鸡蛋中，前者有1.1%呈阳性，后者有0.9%呈阳性。
