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Staphylococcus

Staphylococcus. Classification. Kingdom: Bacteria Phylum: Firmicutes Class: Bacilli Order: Bacillales Family: Staphylococcaceae Genus: Staphylococcus Rosenbach  1884. Organism . Stapyl ( greek word) – bunch of grapes Gram positive cocci arranged in grape like clusters

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Staphylococcus

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  1. Staphylococcus

  2. Classification Kingdom: Bacteria Phylum: Firmicutes Class: Bacilli Order: Bacillales Family: Staphylococcaceae Genus: Staphylococcus Rosenbach 1884

  3. Organism Stapyl (greek word) – bunch of grapes Gram positive cocci arranged in grape like clusters Non-sporulating Colonies on TSA are small, creamy and golden colored Colonies on MSA are yellow and turns the media yellow

  4. Trypticase Soya Agar Mannitol Salt Agar

  5. Staphylococcus aureus? Common - found on the skin and in the noses of up to 25% of healthy people and animals Gastro-enteritis Food poisoning is not caused by the organism but by the toxin that the organism secretes Most common form of food poisoning in the US

  6. Gastro-enteritis • VOMITING • Toxin works on the vomiting control center of the brain (area postrema) and leads to reversal of peristalsis and vomiting • DIARRHEA • Enterotoxin elicits a strong immune response in the region where the toxin is most concentrated. Immune response causes a loss of brush borders in intestinal epithelial cells; these cells cannot absorb water from the gut.

  7. Persistency in nature Relatively heat resistant; toxins are not destroyed even by cooking at 100 celsius Resistant to high concentrations of salt Can survive long periods on dry objects

  8. Source Contact with food workers who carry the bacteria or through contaminated milk and cheeses - most common way for food contamination Foods that are made by hand and require no cooking are at highest risk of contamination with Staphylococcus aureus and subsequent toxin production Some examples of foods that have caused staphylococcal food poisoning are sliced meat, puddings, some pastries and sandwiches

  9. Symptoms Toxins are fast acting - sometimes cause illness in as little as 30 minutes Symptoms usually develop within one to six hours after eating contaminated food Patients typically experience several of the following: nausea, vomiting, stomach cramps, and diarrhea The illness is usually mild and most patients recover after one to three days In a small minority of patients the illness may be more severe.

  10. Diagnosis • In all pus forming lesions • Gram stain and culture of pus • In all systemic infections • Blood culture • In infections of other tissues • Culture of relevant tissue or exudate

  11. Diagnosis • Diagnosis of staphylococcal food poisoning in an individual is generally based only on the signs and symptoms of the patient or empirical treatment • Testing for the toxin-producing bacteria or the toxin is not usually done in individual patients • Testing is usually reserved for outbreaks involving several persons. • Suitable clinical samples • Stool or vomit • Toxin can be detected in food items

  12. Prevention Wash hands and under fingernails vigorously with soap and water before handling and preparing food. Do not prepare food if you have a nose or eye infection. Do not prepare or serve food for others if you have wounds or skin infections on your hands or wrists. Keep kitchens and food-serving areas clean and sanitized. If food is to be stored longer than two hours, keep hot foods hot (over 140°F) and cold foods cold (40°F or under). Store cooked food in a wide, shallow container and refrigerate as soon as possible.

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