Philips H L, Clarkson M J
Department of Veterinary Clinical Science and Animal Husbandry, University of Liverpool, Leahurst, Neston, South Wirral L64 7TE, England.
Infect Immun. 1998 Jun;66(6):2818-21. doi: 10.1128/IAI.66.6.2818-2821.1998.
Pregnant ewes were infected in midpregnancy with three isolates of Chlamydia pecorum derived from the feces of healthy lambs from three different farms. Oral infection, alone or together with Fasciola hepatica, did not result in tissue invasion, since all placental and fecal samples were negative for chlamydiae. Intravenous infection resulted in placental infection in 16 of 18 ewes in that chlamydiae were cultured from placentas or vaginal swabs. Two ewes bore dead lambs after a shortened gestation time. The chlamydiae isolated were all C. pecorum. There were no significant differences between the weights of the lambs from the infected groups and those from uninfected control ewes. Most ewes showed no serological evidence of infection by the complement fixation test; therefore, it is unlikely that the enteric subtype of C. pecorum is responsible for the cross-reactions sometimes seen in flocks being tested for C. psittaci infection.
怀孕母羊在妊娠中期感染了从三个不同农场的健康羔羊粪便中分离出的三种鹦鹉热衣原体菌株。单独口服感染或与肝片吸虫一起感染均未导致组织侵袭，因为所有胎盘和粪便样本的衣原体检测均为阴性。静脉感染导致18只母羊中有16只发生胎盘感染，因为从胎盘或阴道拭子中培养出了衣原体。两只母羊在缩短的妊娠期后产下死胎。分离出的衣原体均为鹦鹉热衣原体。感染组羔羊的体重与未感染对照母羊所产羔羊的体重之间无显著差异。大多数母羊通过补体结合试验未显示感染的血清学证据；因此，鹦鹉热衣原体的肠道亚型不太可能是有时在检测鹦鹉热衣原体感染的羊群中出现交叉反应的原因。
