Staphylococcus aureus causes many serious diseases in humans and animals, and it is the most common aetiologic agent of contagious bovine mastitis. The bacteria produce several virulence factors and the importance of evaluating the combination of these virulence factors has been recently emphasized. In study, the combination of several virulence factors: coagulase gene (coa), protein A gene (spa), collagen-binding protein gene (cna), fibrinogen-binding protein gene (efb), Panton-Valentin leukocydin gene (pvl) and enterotoxins (sea, seb, sec, sed, see, seg, seh, sei, sej) was considered. The analysis of the relationship between presence/absence of the different genes and the udder inflammatory response measured by milk somatic cell counts was performed by general linear models and logistic regression. The classification of isolates in clusters by virulence genes combinations showed that at least one cluster induced a higher inflammatory response. Moreover, the analysis of the association between virulence genes and the presence of a subclinical mastitis showed the role of spa and sej gene as risk factors. These results support that the development of subclinical mastitis could be related to strains characteristics and to the expression of specific combinations of the virulence factors.

Role of several Staphylococcus aureus virulence factors on the inflammatory response in bovine mammary gland / A. Zecconi, L. Cesaris, E. Liandris, V. Daprà, R. Piccinini. - In: MICROBIAL PATHOGENESIS. - ISSN 0882-4010. - 40:4(2006 Apr), pp. 177-183.

Role of several Staphylococcus aureus virulence factors on the inflammatory response in bovine mammary gland

A. Zecconi
Primo
;
L. Cesaris
Secondo
;
E. Liandris;V. Daprà
Penultimo
;
R. Piccinini
Ultimo
2006-04

Abstract

Staphylococcus aureus causes many serious diseases in humans and animals, and it is the most common aetiologic agent of contagious bovine mastitis. The bacteria produce several virulence factors and the importance of evaluating the combination of these virulence factors has been recently emphasized. In study, the combination of several virulence factors: coagulase gene (coa), protein A gene (spa), collagen-binding protein gene (cna), fibrinogen-binding protein gene (efb), Panton-Valentin leukocydin gene (pvl) and enterotoxins (sea, seb, sec, sed, see, seg, seh, sei, sej) was considered. The analysis of the relationship between presence/absence of the different genes and the udder inflammatory response measured by milk somatic cell counts was performed by general linear models and logistic regression. The classification of isolates in clusters by virulence genes combinations showed that at least one cluster induced a higher inflammatory response. Moreover, the analysis of the association between virulence genes and the presence of a subclinical mastitis showed the role of spa and sej gene as risk factors. These results support that the development of subclinical mastitis could be related to strains characteristics and to the expression of specific combinations of the virulence factors.
S. aureus; virulence genes; inflammation; mastitis; coagulase gene polymorphism; toxin genes; protein-a; intramammary infections; subclinical mastitis; dairy herds; cows; strains; adhesin; milk
Settore VET/05 - Malattie Infettive degli Animali Domestici
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/16388
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