Comparative analysis of agr groups and virulence genes among subclinical and clinical mastitis Staphylococcus aureus isolates from sheep flocks of the Northeast of Brazil
Braz. j. microbiol
;
44(2): 493-498, 2013. tab
Article
in English
| LILACS
| ID: lil-688584
ABSTRACT
Staphylococcus aureus is one of the most frequent mastitis causative agents in small ruminants. The expression of most virulence genes of S. aureus is controlled by an accessory gene regulator (agr)locus. This study aimed to ascertain the prevalence of the different agr groups and to evaluate the occurrence of encoding genes for cytotoxin, adhesins and toxins with superantigen activity in S. aureus isolates from milk of ewes with clinical and subclinical mastitis in sheep flocks raised for meat production The agr groups I and II were identified in both cases of clinical and subclinical mastitis. Neither the arg groups III and IV nor negative agr were found. The presence of cflA gene was identified in 100% of the isolates. The frequency of hla and lukE-D genes was high -77.3 and 82.8%, respectively and all isolates from clinical mastitis presented these genes. The sec gene, either associated to tst gene or not, was identified only in isolates from subclinical mastitis. None of the following genes were identified bbp, ebpS, cna, fnbB, icaA, icaD, bap, hlg, lukM-lukF-PV and se-a-b-d-e.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Sheep Diseases
/
Staphylococcal Infections
/
Staphylococcus aureus
/
Bacterial Proteins
/
Carrier State
/
Trans-Activators
/
Virulence Factors
/
Mastitis
Type of study:
Prognostic study
/
Risk factors
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Braz. j. microbiol
Journal subject:
Microbiology
Year:
2013
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade de São Paulo/BR
Similar
MEDLINE
...
LILACS
LIS