A single-cohort study of Cryptosporidium bovis and Cryptosporidium ryanae in dairy cattle from birth to calving.
C. bovis
C. ryanae
Calf
Heifer
Longitudinal
Prospective
Journal
Veterinary parasitology, regional studies and reports
ISSN: 2405-9390
Titre abrégé: Vet Parasitol Reg Stud Reports
Pays: Netherlands
ID NLM: 101680410
Informations de publication
Date de publication:
04 2020
04 2020
Historique:
received:
28
10
2019
revised:
12
02
2020
accepted:
13
03
2020
entrez:
26
5
2020
pubmed:
26
5
2020
medline:
10
3
2021
Statut:
ppublish
Résumé
In order to investigate the infection dynamics of Cryptosporidium bovis and C. ryanae, a two-year prospective cohort study was performed on a dairy farm known to be free of C. parvum. Sixteen calves were recruited when newborn. Faecal samples were collected weekly until calves were nine weeks old, then monthly until calving or culling. Samples (n = 455) were examined by fluorescence microscopy, and when positive the species were determined by DNA sequencing. In calves up to nine weeks, C. bovis was found in 58.5% of the samples, C. ryanae in 9.2%, and both C. bovis and C. ryanae in 3.1%. The prevalence of shedding calves peaked at 87.5% in week five, which is earlier than many international studies have shown for C. bovis. The cumulative incidence of C. bovis reached 100% when the calves were five weeks old. In four calves, the species detected changed from C. bovis to C. ryanae or the other way around, and two samples were a combination of both species. Several individuals shed oocysts sporadically up to 16 months of age. The highest oocysts per gram faeces count was seen in week three (3.6 × 10
Identifiants
pubmed: 32448548
pii: S2405-9390(19)30295-3
doi: 10.1016/j.vprsr.2020.100400
pii:
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
100400Informations de copyright
Copyright © 2020 The Authors. Published by Elsevier B.V. All rights reserved.