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Toxins 2017, 9(6), 195; doi:10.3390/toxins9060195

Virulence Genes of S. aureus from Dairy Cow Mastitis and Contagiousness Risk

1
Department of Veterinary Medicine, University of Milan, Via Celoria 10, 20133 Milan, Italy
2
Italian Breeders Association (A.I.A.), via Tomassetti 9, 00161 Rome, Italy
3
Alere Technologies GmbH, Löbstedter Str. 103-105, 07749 Jena, Germany
4
InfectoGnostics Research Campus, Philosophenweg 7, 07743 Jena, Germany
5
Institute for Medical Microbiology and Hygiene (IMMH), Technische Universität Dresden, Fetscherstrasse 74, D-01307 Dresden, Germany
6
Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna-IZSLER, via Einstein, 26900 Lodi, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Rummel
Received: 25 May 2017 / Revised: 16 June 2017 / Accepted: 19 June 2017 / Published: 21 June 2017
(This article belongs to the Collection Staphylococcus aureus Toxins)
View Full-Text   |   Download PDF [1763 KB, uploaded 21 June 2017]   |  

Abstract

Staphylococcus aureus (S. aureus) is a major agent of dairy cow intramammary infections: the different prevalences of mastitis reported might be related to a combination of S. aureus virulence factors beyond host factors. The present study considered 169 isolates from different Italian dairy herds that were classified into four groups based on the prevalence of S. aureus infection at the first testing: low prevalence (LP), medium–low (MLP), medium–high (MHP) and high (HP). We aimed to correlate the presence of virulence genes with the prevalence of intramammary infections in order to develop new strategies for the control of S. aureus mastitis. Microarray data were statistically evaluated using binary logistic regression and correspondence analysis to screen the risk factors and the relationship between prevalence group and gene. The analysis showed: (1) 24 genes at significant risk of being detected in all the herds with infection prevalence >5%, including genes belonging to microbial surface components recognizing adhesive matrix molecules (MSCRAMMs), immune evasion and serine proteases; and (2) a significant correlation coefficient between the genes interacting with the host immune response and HP isolates against LP ones. These results support the hypothesis that virulence factors, in addition to cow management, could be related to strain contagiousness, offering new insights into vaccine development. View Full-Text
Keywords: mastitis; dairy cow; S. aureus; virulence genes; microarray; prevalence mastitis; dairy cow; S. aureus; virulence genes; microarray; prevalence
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Magro, G.; Biffani, S.; Minozzi, G.; Ehricht, R.; Monecke, S.; Luini, M.; Piccinini, R. Virulence Genes of S. aureus from Dairy Cow Mastitis and Contagiousness Risk. Toxins 2017, 9, 195.

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