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

Åberg, Malin and Emanuelson, Ulf and Troell, Karin and Björkman, Camilla (2019). Infection dynamics of Cryptosporidium bovis and Cryptosporidium ryanae in a Swedish dairy herd. Veterinary parasitology. X. 1 , 1-6
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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.

Authors/Creators:Åberg, Malin and Emanuelson, Ulf and Troell, Karin and Björkman, Camilla
Title:Infection dynamics of Cryptosporidium bovis and Cryptosporidium ryanae in a Swedish dairy herd
Year of publishing :2019
Volume:1
Page range:1-6
Number of Pages:6
Publisher:Elsevier
ISSN:2590-1389
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science
Keywords:Cryptosporidiosis Cryptosporidium spp., Cattle, Pre-weaned calves, Diarrhea
URN:NBN:urn:nbn:se:slu:epsilon-p-101867
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-101867
Additional ID:
Type of IDID
DOI10.1016/j.vpoa.2019.100010
ID Code:16366
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
Deposited By: SLUpub Connector
Deposited On:29 Oct 2019 07:33
Metadata Last Modified:29 Oct 2019 07:33

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