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Phenotypic and genotypic characterization of Pseudomonas aeruginosa strains isolated from mastitis outbreaks in dairy herds

Published online by Cambridge University Press:  26 July 2007

Shlomo Sela ,
Orly Hammer-Muntz ,
Oleg Krifucks ,
Riki Pinto ,
Limor Weisblit  and
Gabriel Leitner
Shlomo Sela
Affiliation:
Microbial Food-Safety Research Unit, Department of Food Sciences, Agricultural Research Organization, The Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Orly Hammer-Muntz
Affiliation:
Microbial Food-Safety Research Unit, Department of Food Sciences, Agricultural Research Organization, The Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Oleg Krifucks
Affiliation:
National Mastitis Reference Center, Kimron Veterinary Institute, PO Box 12, Bet Dagan 50250, Israel
Riki Pinto
Affiliation:
Microbial Food-Safety Research Unit, Department of Food Sciences, Agricultural Research Organization, The Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Limor Weisblit
Affiliation:
National Mastitis Reference Center, Kimron Veterinary Institute, PO Box 12, Bet Dagan 50250, Israel
Gabriel Leitner*
Affiliation:
National Mastitis Reference Center, Kimron Veterinary Institute, PO Box 12, Bet Dagan 50250, Israel
*
*For correspondence; e-mail: leitnerg@moag.gov.il
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Abstract

During 1998–2002 outbreaks of Pseudomonas sp. mastitis among more than 15 Israeli sheep and goat dairy herds were observed. The animals presented a wide spectrum of clinical signs ranging from subclinical to gangrenous udder. Ninety-five isolates of Pseudomonas sp. were isolated from clinical and subclinical mastitis of 47 sheep, 17 goats and 31 cows from 34 different farms. Biochemical and genetic analyses revealed that the all-causative organism was Ps. aeruginosa. Selections of isolates were further analysed on the bases of colony morphology, biochemical traits and capacity to form biofilm. All the strains displayed a wide heterogeneity in all the tested traits. No association between bacterial isolates, farm of origin and type of animal was found. Pulsed-field gel electrophoresis and cluster analysis showed no clonality among the tested strains. The present study revealed that a large variety of Ps. aeruginosa strains may cause mastitis outbreaks in sheep, goat and cattle in Israel.

Keywords

Pseudomonas aeruginosamastitissheepgoatscattle
Type
Research Article
Information
Journal of Dairy Research , Volume 74 , Issue 4 , November 2007 , pp. 425 - 429
Copyright
Copyright © Proprietors of Journal of Dairy Research 2007

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