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Research article - Peer-reviewed, 2019

Infection dynamics of Cryptosporidium bovis and Cryptosporidium ryanae in a Swedish dairy herd

Åberg, Malin; Emanuelson, Ulf; Troell, Karin; Björkman, Camilla

Abstract

In order to investigate the infection dynamics of Cryptosporidium bovis and Cryptosporidium ryanae, a Swedish dairy farm known to be free of C. parvum was recruited for a one-year study. Fecal samples were collected every four weeks (a total of 13 occasions) from 20 randomly selected calves younger than 65 days. A total of 238 feces samples were collected directly from the rectum and then examined with immunofluorescence microscopy; those positive for Cryptosporidium spp. oocysts were further processed by molecular species determination. Oocysts were found in 92 samples, and in 72 of these the species was successfully determined: 87.5% C. bovis, 9.7% C. ryanae and 2.8% a mix of both species. No C. parvum was found. The prevalence of shedding calves was highest at ages 4 and 5 weeks; however, the feces with the highest oocyst per gram (OPG) were registered at 2–4 weeks of age. This is earlier than what has been found in most other studies, indicating that the infection dynamics of C. bovis/C. ryanae may be affected by the presence of C. parvum. The OPG for the positive calves ranged from 200 to 1.1 × 106 (geometric mean 6.88 × 103 ). The youngest calf in which C. bovis was identified was 5 days old, and the youngest calf in which C. ryanae was identified was 15 days old. Calves’ housing type and seasonality were not associated with differences in the shedding of oocysts. Furthermore, there was no association between the presence of diarrhea and oocyst shedding.

Keywords

Cattle; Cryptosporidiosis Cryptosporidium spp.; Diarrhea; Pre-weaned calves

Published in

Veterinary parasitology. X
2019, volume: 1, article number: 100010

Authors' information

Åberg, Malin
Swedish University of Agricultural Sciences, Department of Clinical Sciences
Swedish University of Agricultural Sciences, Department of Clinical Sciences
Troell, Karin
National Veterinary Institute (SVA)
Swedish University of Agricultural Sciences, Department of Clinical Sciences

Sustainable Development Goals

SDG2 Zero hunger

UKÄ Subject classification

Veterinary Science
Animal and Dairy Science

Publication Identifiers

DOI: https://doi.org/10.1016/j.vpoa.2019.100010

URI (permanent link to this page)

https://res.slu.se/id/publ/101867