Intrauterine and transmammary transmission of Mycobacterium avium subsp paratuberculosis in sheep

Australian Veterinary Journal
C LambethR J Whittington

Abstract

To investigate intrauterine infection of foetuses with Mycobacterium avium subsp paratuberculosis and the presence of infection in mammary secretions of sheep. A study of 142 late-pregnant ewes and their foetuses from two heavily infected flocks. Infection of ewes was determined at necropsy by histopathology and culture of tissues and mammary secretions. Antemortem tests (clinical assessment, faecal culture and serology) were also applied. Foetuses from 59 infected ewes and 47 apparently uninfected ewes were examined by culture and histopathology. Five of five ewes with clinical ovine Johne's disease had infected foetuses. Only one of 54 subclinically affected ewes, and none of 47 uninfected ewes had an infected foetus. M a paratuberculosis was cultured from mammary secretions or mammary glands of only two of 76 ewes, both of which were clinical cases and had infected foetuses. Although intrauterine or transmammary transmission of Mycobacterium avium subsp paratuberculosis may occur frequently in clinically affected sheep, these are less common in subclinically infected ewes. Therefore these modes of transmission are unlikely to compromise existing control programs for ovine Johne's disease on most farms, especially if programs...Continue Reading

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Citations

Oct 12, 2012·Tropical Animal Health and Production·Mohamed SalemGeorge Baljer
Feb 4, 2016·Reproduction in Domestic Animals = Zuchthygiene·I Garcia-Ispierto, F López-Gatius
Dec 25, 2012·Research in Veterinary Science·T CartaC Gortázar
Nov 26, 2009·Journal of Microbiological Methods·Katrina BowerRichard J Whittington
Jan 26, 2010·International Journal of Food Microbiology·K Adam, F Brülisauer
Oct 12, 2007·The Veterinary Journal·Richard J Whittington, Peter A Windsor
Apr 23, 2013·Reproduction in Domestic Animals = Zuchthygiene·R PribylovaI Pavlik
Aug 11, 2015·Veterinary Microbiology·P A Windsor
Jun 3, 2009·Journal of Applied Microbiology·M M EltholthF J Guitian
Mar 8, 2011·Journal of Food Protection·C O GillW J Meadus

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