Xiao L, Herd R P, McClure K E
Department of Veterinary Preventive Medicine, Ohio State University College of Veterinary Medicine, Columbus 43210.
J Parasitol. 1994 Feb;80(1):55-9.
The possibility of a periparturient rise (PPR) in the excretion of Cryptosporidium parvum oocysts and Giardia duodenalis-type cysts and its implications in the epidemiology of these 2 pathogens were investigated. Fecal samples were taken from 32 lambing ewes every 2 wk from 4 wk before lambing until 8 wk after the start of lambing. Samples from both ewes and lambs were examined with a quantitative immunofluorescence assay. Excretion of Giardia sp. cysts by ewes increased at 2 wk prepartum, peaked at zero and 4 wk postpartum, and returned to low levels at 6 and 8 wk postpartum. Some ewes also excreted C. parvum oocysts at the start of lambing. Excretion rates and intensities of Giardia sp. cysts by lambs were high, whereas those of C. parvum oocyst excretion were light. The PPR in excretion of Giardia sp. cysts by ewes was considered to be the major source of giardiasis for lambs. Excretion of C. parvum oocysts by ewes at parturition also played a role in initiating cryptosporidiosis in lambs.
研究了围产期小隐孢子虫卵囊和十二指肠贾第虫样包囊排泄量的围产期升高（PPR）可能性及其对这两种病原体流行病学的影响。从产羔前4周直到产羔开始后8周，每2周从32只产羔母羊采集粪便样本。对母羊和羔羊的样本均采用定量免疫荧光分析法进行检测。母羊贾第虫属包囊的排泄量在产前2周增加，在产后0周和4周达到峰值，并在产后6周和8周恢复到低水平。一些母羊在产羔开始时也排泄小隐孢子虫卵囊。羔羊贾第虫属包囊的排泄率和排泄强度较高，而小隐孢子虫卵囊的排泄率和排泄强度较低。母羊贾第虫属包囊排泄量的围产期升高被认为是羔羊贾第虫病的主要来源。母羊在分娩时排泄小隐孢子虫卵囊也在羔羊隐孢子虫病的发生中起作用。
