The quorum-sensing system of Staphylococcus aureus, the accessory gene regulator (Agr) system, is responsible for increased transcription of certain exoprotein genes and decreased transcription of certain cell wall-associated proteins during the postexponential phase of growth. This regulation is important for virulence, as evidenced by a reduction in virulence associated with a loss of the Agr...

The current study aims to use coagulase (coa) polymorphism gene to identify Staphylococcus aureus isolated from stool samples, evaluate the efficiency of these methods in discriminating variable strains, and compare these subtypes with antibiotypes. A total of 100 specimens were collected from patients in Babylon province, Iraq, between July 2016 and September 2016. Twenty S. aureus strains wer...

Objectives: Staphylococcus aureus is an important pathogen associated with diseases in a variety of hosts including humans. It produces several toxins and virulence factors that contribute to its pathogenic potential such as staphylococcal enterotoxins (SEs). This study was conducted to determine enterotoxigenicity of S. aureus associated with chronic urogenital tract infection by detecting ent...

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...

ABSTRACT: Pigeons are known for their capacity to harbor and spread several zoonotic agents. Studies have suggested that pigeons also relevant disseminators of multidrug-resistant strains. In this study, surrounding a veterinary hospital were sampled tested the presence pathogenic Escherichia coli, Salmonella spp., Staphylococcus Clostridioides (Clostridium) difficile. E. coli isolates from 19 ...

Enterotoxin of Clostridium perfringens was assayed and compared with toxicity in mice and erythemal activity in guinea pigs. Conversion factors were used to express these biological activities of crude enterotoxin in terms of weight of pure enterotoxin protein. One microgram of enterotoxin was equivalent to 3.41 erythema units and to 0.68 mouse median lethal dose.

Glucose-grown cells of Bacillus cereus respond to anaerobiosis and low extracellular oxidoreduction potentials (ORP), notably by enhancing enterotoxin production. This response involves the ResDE two-component system. We searched the B. cereus genome for other redox response regulators potentially involved in this adaptive process, and we identified one gene encoding a protein predicted to have...

Clostridium perfringens type A enterotoxin was specifically detected and readily quantified by indirect and four-layer sandwich enzyme-linked immunosorbent assays (ELISAs). With the indirect ELISA, enterotoxin was detected in quantities of as low as 2.5 ng (25 ng/ml). When the more sensitive sandwich ELISA procedures was used, 100 pg (1 ng/ml) of enterotoxin was detected. The sandwich ELISA pro...

Milk and its products can be frequently contaminated with enterotoxigenic methicillin-resistant S. aureus, in such a case, it causes various diseases, especially staphylococcal food poisoning. In the present study, 100 sample materials (50 goat milk, 25 cream, cheese) were collected from 65 livestock farms Erzurum. All samples analyzed tested selectively according to EN ISO 6888-1 procedure sta...