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Short communication: Comparison of virulence factors in Klebsiella pneumoniae strains associated with multiple or single cases of mastitis

Klebsiella pneumoniae mastitis in dairy cattle is generally due to an opportunistic infection from the environment, resulting in large heterogeneity among mastitis-causing strains within a herd. However, in mastitis outbreaks in 4 herds, several strains of K. pneumoniae were identified as the cause...

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Published in:Journal of dairy science 2014-04, Vol.97 (4), p.2213-2218
Main Authors: Kanevsky-Mullarky, I., Nedrow, A.J., Garst, S., Wark, W., Dickenson, M., Petersson-Wolfe, C.S., Zadoks, R.N.
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cited_by cdi_FETCH-LOGICAL-c380t-71bf5b220faf3c090c6af09e2647dc21b3bf274c5a8dc6f4d78b601ff5cb515f3
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container_title Journal of dairy science
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creator Kanevsky-Mullarky, I.
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Zadoks, R.N.
description Klebsiella pneumoniae mastitis in dairy cattle is generally due to an opportunistic infection from the environment, resulting in large heterogeneity among mastitis-causing strains within a herd. However, in mastitis outbreaks in 4 herds, several strains of K. pneumoniae were identified as the cause of infection in multiple cows, suggesting increased ability to either cause disease or evade host defenses. In this study, differences in capsule formation and immune evasion were compared in 5 pairs of K. pneumoniae strains, where one strain in each pair was associated with multiple cases of mastitis and the other with a single case of mastitis. Production of capsular polysaccharide, ability to evade killing by polymorphonuclear neutrophilic leukocytes (PMNL), and the relationship between the 2 were evaluated for each strain grown in broth or milk. Growth of isolates in skim milk increased capsule size and ability to evade killing by PMNL, depending on strain type. Specifically, strains associated with multiple cases of mastitis had increased capsule size in skim milk. Strains associated with single cases of mastitis were better able to evade killing by PMNL when grown in skim milk. Our results, although preliminary, suggest that the 2 groups of strains may constitute different subpopulations of K. pneumoniae. However, our findings do not indicate that capsule or evasions of killing by PMNL explain increased mastitis outbreaks with Klebsiella. Further work will explain the enhanced ability of some strains to cause mastitis in dairy cows.
doi_str_mv 10.3168/jds.2013-7140
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source Elsevier ScienceDirect Journals; EZB Electronic Journals Library
subjects Animals
bovine mastitis
capsule
Cattle
Disease Outbreaks - veterinary
Female
Klebsiella Infections - veterinary
Klebsiella pneumoniae
Klebsiella pneumoniae - pathogenicity
Klebsiella pneumoniae - physiology
Mastitis, Bovine - epidemiology
Mastitis, Bovine - microbiology
Mastitis, Bovine - transmission
neutrophil
New York - epidemiology
Virulence Factors - genetics
Virulence Factors - metabolism
title Short communication: Comparison of virulence factors in Klebsiella pneumoniae strains associated with multiple or single cases of mastitis
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