Stranica 1 iz 38 rezultatima
BACKGROUND
This study examined whether activation of innate immunity and alterations of carbohydrate and lipid metabolism precede development of subclinical mastitis (SCM).
METHODS
Blood samples were collected from the coccygeal vein from 100 Holstein dairy cows at -8, -4, disease diagnosis week,
Cows were inoculated intradermally with two strains of Staphylococcus aureus, and the severity of the resulting skin lesions was assessed on the basis of size, degree of necrosis, and in some cases by measuring the area of inflammation in histological preparations of excised skin. At least 10(6)
Intramammary infection leading to bovine mastitis is the leading disease problem affecting dairy cows and has marked effects on the milk produced by infected udder quarters. An experimental model of Streptococcus uberis mastitis has previously been investigated for clinical, immunological and
Lactococcus lactis is a widely used mesophilic dairy starter and has been included in the Qualified Presumption of Safety (QPS) list of the European Food Safety Authority. However, it is increasingly found as the cause of human or animal infections, such as bovine mastitis, probably due to the
To better understand the acute host response to Escherichia coli mastitis, we analyzed gene expression patterns of approximately 23,000 transcripts 4 h after an intramammary infusion of lipopolysaccharide (LPS) in a mouse model. A total of 489 genes were significantly affected, of which 391 were
Here we describe a new species of the genus Streptococcus that was isolated from a dairy cow with mastitis in New Zealand. Strain NZ1587T was Gram-positive, coccus-shaped and arranged as chains, catalase and coagulase negative, γ-haemolytic and negative for Lancefield carbohydrates (A-D, F and G).
Staphylococcus aureus is a major cause of bovine mastitis. Since gene expression of many bacteria is known to be regulated by the environment, milk may play an important role in the regulation of the early steps in the pathogenesis of bovine mastitis by S. aureus. To get insight into the response of
The phagocytic and chemiluminescent activity of purified bovine neutrophils in response to two Staphylococcus aureus strains isolated from mastitic bovine milk and grown in milk whey was studied. The activity was significantly reduced compared with the response elicited by the same strains grown in
Mastitis in lactating mothers reduces milk production and alters the cellular composition of milk. Changes occurring in the mammary gland during the inflammatory response are believed to increase the permeability of the blood-milk barrier. This study examined the effect of mastitis during lactation
Staphylococcus aureus strains isolated from bovine mastitis exhibited hemagglutinating activity when cultivated on nutrient-poor, solid medium. Out of 56 strains, 41 (73%) hemagglutinated. S. aureus agglutinated sheep erythrocytes to a greater extent than it agglutinated either human, bovine or
It seems clearly established that non-hemolytic streptococci are responsible for a considerable number of cases of bovine mastitis. Of the 81 animals examined, 31 were suffering from infections of this type. The lesions produced in invaded quarters varied from an involvement of only the lining
To determine whether staphylococci causing bovine mastitis are potential causes of human intoxications, 142 cultures identified as etiological agents of acute cases and 18 cultures causing chronic cases of staphylococcal mastitis were obtained from investigators in the United States and Canada,
The objectives of this study were to determine alterations in the serum metabolites related to amino acid (AA), carbohydrate, and lipid metabolism in transition dairy cows before diagnosis of subclinical mastitis (SCM), during, and after diagnosis of disease. A subclinical mastitis case was
Mastitis in dairy ruminants is considered to be the most expensive disease to farmers worldwide. Recently, the intramammary infusion of lactic acid bacteria has emerged as a potential new alternative to antibiotics for preventing and treating bovine mastitis. In this study we have investigated in