Zoonoses disease-staphylococcosis, Biology

Staphylococcosis
The disease is caused by the ingestion of preformed toxin released by Staphylococcus aureus.


Epidemiology:
Staphylococci grow in meat, dairy and bakery products and produce enterotoxins. In food microbiology, detection of S. aureus is of interest as it indicates the mishandling of the product, due to poor hygiene during processing. Sources of  staphylococci contaminations may be animals, human carriers and contaminated processing equipment. Pathogenic strains of Staphylococcus species produce several toxins and enzymes, viz. coagulase, hyaluronidase, phosphatase, fibrinolysin, haemolysin (á, â and ä haemolysin), necrotoxin, lethal toxin, leucocidin and enterotoxin.


Clinical features:
The incubation period is short usually ranges from 1–8 hours and rarely up to 18 hours. Enterotoxin acts on receptors in gut that transmits impulse to medullary center. Abrupt and intense vomiting occurs for up to 24 hours. It takes 24-48 hours to recover.

Diagnosis: For isolation, enrichment can be done in staphylococcal enrichment broth or alternatively in trypticase soy broth with 10% sodium chloride and 1% sodium pyruvate. Baird Parker agar is the medium of choice on which shiny, jet black colonies appears showing zone of precipitation around the colony or halo around the colony with white precipitation beneath the colony or no zone or halo but only precipitation beneath the colony. The nuc-gene, encoding the thermostable nuclease (TNase) is used for PCR based detection of S. aureus. Use of PCR is also described to screen S. aurues for the presence of enterotoxin genes. Some of the enterotoxin genes detected by PCR in S. aurues are entA, entB, entC1, entD, entE, toxic shock syndrome (tst) and exfoliative toxin A & B (eta, etb).

Posted Date: 9/20/2012 2:46:15 AM | Location : United States







Related Discussions:- Zoonoses disease-staphylococcosis, Assignment Help, Ask Question on Zoonoses disease-staphylococcosis, Get Answer, Expert's Help, Zoonoses disease-staphylococcosis Discussions

Write discussion on Zoonoses disease-staphylococcosis
Your posts are moderated
Related Questions
Cell Determination Cell determination is a process through which portions of embryonic genome are selected for expression in particular embryonic cells. Determination to follo

Explain some Do's and Don'ts when working in Laboratory? 1) Always wear a lab coat when working a laboratory. 2) Ensure that no harm is caused to yourself or the people work

Q. What are the main intraspecific ecological interactions? The major harmonious intraspecific ecological interactions are societies and colonies. The major inharmonious intras

1) It is the series of coupled oxidation/reduction reactions where the electrons are passed like hot potatoes from one membrane-bound protein/enzyme to another before being finally

a) The elongation level of translation in eukaryotes requires three elongation factors, eEF-IB, eEF-1A and eEF-2, that have similar functions to their prokaryotic counterparts EF-G

What is Splitin first heart sound ? In complete RBBB, due to delay of tricuspid closure, the split is wide. In complete LBBB, due to delay of mitral closure the S I is single.

CHF complicating IE is primarily the result of valve destruction or distortion or rupture of chordae tendinae. Intracardiac fistulas, myocarditis, or coronary artery embolization m


The frequency of an autosomal recessive disease in a population is 1 in a million. An unaffected person who had a sibling affected with this disease marries a lady from the pop

Nocardiosis Nocardiae are aerobic, saprophytic, gram-positive, partially acid-fast filamentous bacteria. Currently, there are 30 species included within the genus. Members of