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
Q. What are the complications of chronic dyspepsia? Complications of dyspepsia are listed below: • Wright loss: Since eating most of tell provokes the symptoms, patients res

Define Recommended Dietary Allowances for Vitamin D? The recommendations of vitamin D are expressed as IU. 1 IU is defined as the activity contained in 0.025 mcg of cholecalci

Pre-conditions for GTT You are advised to carry out the GTT (OGTT) test to confirm a diagnosis of diabetes mellitus for a person with: a) The history of glycosuria (glucose

State the Lantern Test  The patient names colours displayed in the lantern and the mistakes are analyzed. This is not the best method of testing because it depends on the natu

Determine the Wechsler Intelligence Scales This test is given according to manual instructions and is not modified in any way. Most clinicians use the most current revision of

Define Clinical Features and Medical Complications for bulimia? Unlike, anorexia nervosa, in bulimia you will find that symptoms are more difficult to detect because patients a

i need examples of animals that belongs to vertevrate pisces

Jennifer has the "stomach flu" that is going around campus and has been vomiting profusely for the past 24 hours. Not only has she been unable to keep down fluids or food but she h

How Hormonal Status affects the bmr? Thyroid status may be most important factor and can make differences of up to plus or minus 50% for hyperthyroidism or hypothyroidism, resp

Name the high-energy complex generated during the conversion of succinyl CoA to succinate in the citric acid cycle GTP  or  ATP is  the high-energy  complex generated during th