Document Detail


Role of adult sheep in transmission of infection by Cryptosporidium parvum to lambs: confirmation of periparturient rise.
MedLine Citation:
PMID:  10576577     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In sheep farms, oocyst shedding by asymptomatic adult carriers is one of the mechanisms which may explain maintenance of infections by Cryptosporidium parvum between lambing periods. The objective of this work was to investigate this hypothesis and the existence of a periparturient rise in oocyst shedding. Fourteen pregnant sheep were randomly selected from two farms with a history of neonatal diarrhoea caused by C. parvum and samples were collected from the 6th week before birth until 2 weeks after birth. Faecal samples were filtered, concentrated and examined for oocysts using an indirect immunofluorescence assay. The kinetics of anti-C. parvum antibodies (IgG and IgA) were studied using an indirect enzyme-linked immunosorbent assay. All except one animal excreted C. parrum oocysts at some time during the experimental period. The percentage of animals passing oocysts increased in the first week post-partum (farm 1) and in the first week before birth (farm 2). The numbers of oocysts excreted ranged from 20-440 oocysts g(-1) of faeces. In contrast, no significant changes in the anti-C. parvum immunoglobulin levels were observed over the sampling period. Finally, a high percentage of lambs (71%) born to these ewes acquired infection in the first 2 weeks of life.
Authors:
L M Ortega-Mora; J A Requejo-Fernández; M Pilar-Izquierdo; J Pereira-Bueno
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal for parasitology     Volume:  29     ISSN:  0020-7519     ISO Abbreviation:  Int. J. Parasitol.     Publication Date:  1999 Aug 
Date Detail:
Created Date:  2000-01-05     Completed Date:  2000-01-05     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0314024     Medline TA:  Int J Parasitol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1261-8     Citation Subset:  IM    
Affiliation:
Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Spain. luisucm@eucmax.sim.ucm.es
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Newborn
Antibodies, Protozoan / blood
Cryptosporidiosis / parasitology,  transmission,  veterinary*
Cryptosporidium parvum / isolation & purification
Feces / parasitology
Female
Immunoglobulin A / blood
Immunoglobulin G / blood
Labor, Obstetric
Parasite Egg Count
Pregnancy
Pregnancy Complications, Parasitic / parasitology,  veterinary*
Sheep
Sheep Diseases / parasitology,  transmission*
Chemical
Reg. No./Substance:
0/Antibodies, Protozoan; 0/Immunoglobulin A; 0/Immunoglobulin G

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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