Clinical and histopathological aspects of naturally occurring mastitis caused by Listeria monocytogenes in cattle and ewes

Journal of Veterinary Medicine. B, Infectious Diseases and Veterinary Public Health
P WinterM Wagner

Abstract

Listeria monocytogenes was isolated from the milk of two cows and two sheep with mastitis in one quarter and one udder half. The animals were observed over a period of 2-12 months. Clinical examination of the udder, bacteriological examinations and determination of somatic cell counts of milk samples were performed monthly. All four cases suffered from a subclinical mastitis characterized by an elevated somatic cell count (0.8-10.1 x 10(6) cells/ml), a persistent shedding of Listeria and by a normal appearance of the milk. The animals did not show any systemic reaction, but all animals developed an atrophy of the infected mammary gland. Histological examinations revealed a chronic interstitial mastitis with diffuse infiltration of lymphocytes, plasma cells and macrophages. All internal organs showed no abnormalities, no Listeria could be isolated. Listeria could however be isolated from the affected mammary parenchyma and from the mammary lymph node. The results of the bacteriological examination could be confirmed by means of PCR. Using PFGE, all the isolates from the same animal were identical. Immunohistochemical examination of the ovine mammary glands achieved a very strong immunoreactivity for CD5 cells. The mode of infect...Continue Reading

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Citations

Dec 31, 2008·Applied and Environmental Microbiology·Alejandra A LatorreYnte H Schukken
Jul 10, 2012·Irish Veterinary Journal·Karen HuntKieran Jordan
Mar 6, 2010·Interdisciplinary Perspectives on Infectious Diseases·Anna OevermannMarc Vandevelde
Feb 11, 2009·The Journal of Infection·Amos AdlerStanford T Shulman
Oct 13, 2005·Journal of Veterinary Medicine. B, Infectious Diseases and Veterinary Public Health·M WagnerD Schoder
Jul 29, 2015·Veterinary Microbiology·A I GelasakisG C Fthenakis
Jun 11, 2016·Risk Analysis : an Official Publication of the Society for Risk Analysis·Roberto CondoleoLuca Bucchini
Nov 17, 2016·Scientific Reports·Margaux DreyerAnna Oevermann
Oct 24, 2007·Journal of Dairy Science·M J VilarJ L Rodríguez-Otero
Jan 6, 2009·The Veterinary Record·H ThompsonA W Philbey

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