Difference in virulence between Staphylococcus aureus isolates causing gangrenous 2 mastitis versus subclinical mastitis in a dairy sheep flock 3 4 Eric VAUTOR Abstract – Staphylococcus aureus mastitis in dairy sheep ranges from subclinical mastitis to 22 lethal gangrenous mastitis. Neither the S. aureus virulence factors nor the host-factors or the 23 epidemiological events contributing to the...

four-hundred milk samples from half udders of 20 flocks of native breed goats were asepticallycollected. the samples were examined by california mastitis test (cmt). twenty-one (5.25%) of 400 werecmt-positive. the cmt-positive samples were then cultured and the following bacteria were isolated:staphylococcus aureus in 3 (14.28%), cns (coagulase-negative staphylococci) in 14 (66.66%), streptococ...

The aim of this work was to investigate the prevalence and aetiology of mastitis in sheep from farms in the region of Évora, Portugal; to detect virulence factors expressed by causative micro-organisms and deepen the knowledge about the defence mechanisms of the mammary gland in sheep. This knowledge may contribute to consider innovative strategies for the prevention and treatment of mastitis, ...

Staphylococcus aureus mastitis in dairy sheep ranges from subclinical mastitis to lethal gangrenous mastitis. Neither the S. aureus virulence factors nor the host-factors or the epidemiological events contributing to the different outcomes are known. In a field study in a dairy sheep farm over 21 months, 16 natural isolates of S. aureus were collected from six subclinical mastitis cases, one le...

This study was conducted in Qassim region, Central of Saudi Arabia on 562 animals (310 sheep and 252 goats) to determine the prevalence and aetiology of clinical mastitis in sheep and goats in addition, to characterize the genetic basis of multidrug resistance of the isolated bacteria. The overall prevalence of clinical mastitis (CM) was 9.43% (53/562) where it was 7.74% (24/310) and 11.50% (29...

Mastitis, an inflammation of the mammary gland, is the most widespread health problem of dairy cows, goats and sheep (Bačić et al. 2015., Mačešić et al. 2012). Its prevention and treatment contribute to significant financial loss to the milk producers. New research shows that the total loss due to clinical mastitis in dairy cows is estimatedbetween 110 and 550 litres of milk per lactation, depe...

Mastitis is the most frequent and costly disease of lactating animals and is associated with a significant reduction in milk yield, increased cost and culling. Early and specific antibiotic based treatment reduces the severity of the disease. Over the years the extensive use of antimicrobials has led to increase antimicrobial resistance. The present study was designed to investigate the prevale...

Staphylococcus aureus is a major etiological agent of mastitis in ruminants. We report here the genome sequences of two ovine strains that were isolated from gangrenous (strain O11) and subclinical (strain O46) ewe mastitis. Both strains belong to the same clonal complex. Despite this close genotypic relationship, the two isolates were shown to reproducibly induce highly divergent types of infe...

BACKGROUND Mastitis is one of the most important diseases affecting dairy sheep. Antimicrobial drugs are often administered directly through teat to treat or prevent this disease, but data on drug distribution within glandular tissue are scarce and it cannot be estimated from concentrations in milk. Thus, the aim of this study was to investigate systemic and mammary gland distribution of enrofl...

Staphylococcus aureus is the most common mastitis-related pathogen in dairy cattle, goats, and sheep worldwide. However, population structure genomic characteristics of mastitis-associated S. small ruminants are limited. Furthermore, genotypic phenotypic involved pathogenicity have been thoroughly defined, yet their association with severity mastitis not fully established. Here, we performed ge...