Even though the bacterium itself may be killed, the enterotoxins alone can cause vomiting and diarrhea, although the mechanisms are not fully understood. They are heat stable and are not destroyed by boiling at 100 ☌. The enterotoxins are proteins that are resistant to low pH, allowing them to pass through the stomach. There are at least 21 Staphylococcal enterotoxins and Staphylococcal enterotoxin-like toxins that can cause food intoxication. Temperatures above refrigeration and below the minimum cooking temperature may allow for microbial growth, increasing the likelihood of foodborne disease. Cooked foods should generally be reheated to at least 60 ☌ (140 ☏) for safety and most raw meats should be cooked to even higher internal temperatures ( Figure 24.16).įigure 24.16 This figure indicates safe internal temperatures associated with the refrigeration, cooking, and reheating of different foods. The greatest risk is for food left at a temperature below 60 ☌ (140 ☏), which allows the bacteria to grow. It is also commonly found on hands and can be transmitted to prepared foods through poor hygiene, including poor handwashing and the use of contaminated food preparation surfaces, such as cutting boards. aureus is often associated with a variety of raw or undercooked and cooked foods including meat (e.g., canned meat, ham, and sausages) and dairy products (e.g., cheeses, milk, and butter). Signs and symptoms resolve within 24 to 48 hours. ![]() In some severe cases, it may cause headache, dehydration, and changes in blood pressure and heart rate. When Staphylococcus aureus grows in food, it may produce enterotoxins that, when ingested, can cause symptoms such as nausea, diarrhea, cramping, and vomiting within one to six hours. ![]() Staphylococcal food poisoning is one form of food intoxication. Oral rehydration therapy with electrolyte solutions is an essential aspect of treatment for most patients with GI disease, especially in children and infants. Most bacterial gastrointestinal illness is short-lived and self-limiting however, loss of fluids due to severe diarrheal illness can lead to dehydration that can, in some cases, be fatal without proper treatment. Symptoms of foodborne diseases also often include nausea and vomiting, which are mechanisms the body uses to expel the toxic materials. This leads to the common signs and symptoms of diarrhea or watery stool and abdominal cramps, or the more severe dysentery. In either case, the toxins cause damage to the cells lining the gastrointestinal tract, typically the colon. In an intoxication, bacteria produce toxins in the food before it is ingested. In an infection, the microbial agent is ingested, colonizes the gut, and then produces toxins that damage host cells. The distinction lies in where the toxins are produced. In both cases, bacterial toxins are typically responsible for producing disease signs and symptoms. ![]() Recall that foodborne disease can arise from either infection or intoxication. Compare the major characteristics of specific bacterial diseases affecting the GI tractĪ wide range of gastrointestinal diseases are caused by bacterial contamination of food. ![]() Identify the most common bacteria that can cause infections of the GI tract.By the end of this section, you will be able to:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |