course hero which of the following statements about staphylococcal enterotoxin is false?

Where are endotoxins found in bacteria?

What is the A-B exotoxins?

Which is more lethal, Shiga or Staphylococcal?

What is the role of endotoxins in the body?

How does an individual contract a gastrointestinal infection?

Which neurotoxin causes uncontrollable muscle contractions?

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What does staphylococcal enterotoxin do?

Staphylococcal enterotoxin B is one of the most potent bacterial superantigens that exerts profound toxic effects upon the immune system, leading to stimulation of cytokine release and inflammation. It is associated with food poisoning, nonmenstrual toxic shock, atopic dermatitis, asthma, and nasal polyps in humans.

What are the enterotoxins of Staphylococcus aureus?

The S. aureus enterotoxins (SEs) are potent gastrointestinal exotoxins synthesized by S. aureus throughout the logarithmic phase of growth or during the transition from the exponential to the stationary phase [16,17,18,19,20].

What causes staphylococcal enterotoxin?

Staphylococcal enterotoxin B (SEB) is a harmful substances, called a toxin, produced by the bacterium Staphylococcus aureus . It is a common contributor to food poisoning in humans. The bacteria grow and produce toxins in unrefrigerated meats, dairy, and bakery products.

Which is an example of an enterotoxin?

(Science: microbiology) group of bacterial exotoxins produced by enterobacteria and that act on the intestinal mucosa. By perturbing ion and water transport systems they induce diarrhoea. Cholera toxin is the best known example.

Which of the following are characteristics of Staphylococcus species?

Characteristics. Staphylococci are Gram-positive, nonspore forming, facultatively anaerobic, nonmotile, catalase-positive or negative, small, spherical bacteria from pairs to, grape-like clusters, from where the name Staphylococcus comes from (staphyle, meaning a bunch of grapes, and kokkos, meaning berry).

Is staphylococcal enterotoxin produced by?

Staphylococcal enterotoxins are exotoxins produced by Staphylococcus aureus that possess emetic and superantigenic properties.

Is staphylococcal enterotoxin fatal?

Mortality/Morbidity. The gastrointestinal form of staphylococcal enterotoxin B (SEB) toxicity, while potentially debilitating for short durations, is rarely fatal with adequate hydration. No relevant aggregate data are available regarding the mortality and morbidity of inhalational SEB exposure.

Which of the following is associated with staphylococcal food poisoning?

Staph food poisoning is characterized by a sudden start of nausea, vomiting, and stomach cramps. Most people also have diarrhea. Symptoms usually develop within 30 minutes to 8 hours after eating or drinking an item containing Staph toxin, and last no longer than 1 day. Severe illness is rare.

What's the cause of Staphylococcus?

Staph infections are caused by staphylococcus bacteria. These types of germs are commonly found on the skin or in the nose of many healthy people. Most of the time, these bacteria cause no problems or cause relatively minor skin infections.

How many enterotoxin of Staphylococcus are known till now?

Although there are more than 20 distinct staphylococcal enterotoxins, only a few of them have been studied in depth. The most common staphylococcal enterotoxins are SEA and SEB.

What type of bacteria can produce enterotoxins?

Abstract. Staphylococcal enterotoxins (SEs) are produced by some Staphylococcus aureus strains contaminating foodstuffs and are the real causative agents of staphylococcal food poisoning.

What effect do enterotoxins have quizlet?

What effect do enterotoxins have? - They affect the nervous system. - They are released from Gram-negative bacteria and can cause fever, inflammation, hemorrhaging, shock, and blood coagulation.

How many different enterotoxins are produced by Staphylococcus aureus?

Abstract. Staphylococcal enterotoxins (SEs) are produced by some Staphylococcus aureus strains contaminating foodstuffs and are the real causative agents of staphylococcal food poisoning. To date, 24 different SEs have been described, based on sequence homology but only a few of them have been fully characterized.

What are the three types of exotoxins?

There are three main types of exotoxins: superantigens (Type I toxins); exotoxins that damage host cell membranes (Type II toxins); and. A-B toxins and other toxin that interfere with host cell function (Type III toxins).

Which of the following pathogens produce enterotoxins?

Enterotoxins can be formed by the bacterial pathogens Staphylococcus aureus and Bacillus cereus and can cause Staphylococcal Food Poisoning and Bacillus cereus diarrheal disease, respectively.

Is staph aureus enterotoxin heat stable?

Staphylococcal food poisoning (SFP) results from the consumption of foods containing sufficient amounts of one or more preformed staphylococcal enterotoxins (SEs). SEs are heat stable and can withstand heat at 121 degrees C for 10 min.

Where are endotoxins found in bacteria?

Endotoxins are part of the outer portion of the cell wall of gram-positive bacteria.

What is the A-B exotoxins?

In A-B exotoxins, the A component binds to the host cell receptor so that the B component can enter the cell. In A-B exotoxins, the A component binds to the host cell receptor so that the B component can enter the cell. True. False.

Which is more lethal, Shiga or Staphylococcal?

Shiga toxin is more lethal than staphylococcal enterotoxin. The parenteral route is the preferred portal entry for Shigella bacteria. More organisms of Staphylococcal bacteria must be ingested to cause infection, as compared Shigella bacteria. Staphylococcal enterotoxin is the more lethal of the two toxins. a.

What is the role of endotoxins in the body?

Endotoxins induce host cells to produce effective antitoxins that help to protect them against the toxin's effects.

How does an individual contract a gastrointestinal infection?

An individual contracts a gastrointestinal infection by consuming contaminated water.

Which neurotoxin causes uncontrollable muscle contractions?

tetanus toxin: an A-B neurotoxin that causes uncontrollable muscle contractions. streptococcal erythrogenic toxin: a superantigen that damages capillaries and results in a characteristic rash. Vibrio enterotoxin: a superantigen that destroys epithelial cells.

Where is Staphylococcus aureus produced?

B) It is produced by Staphylococcus aureus growing in the host's intestines.

What is the C of the respiratory tract?

C) mucous membranes of the respiratory tract.

Is streptococcal colonization necessary for periodontal disease?

A) streptococcal colonization is necessary for periodontal disease.

Where are endotoxins found in bacteria?

Endotoxins are part of the outer portion of the cell wall of gram-positive bacteria.

What is the A-B exotoxins?

In A-B exotoxins, the A component binds to the host cell receptor so that the B component can enter the cell. In A-B exotoxins, the A component binds to the host cell receptor so that the B component can enter the cell. True. False.

Which is more lethal, Shiga or Staphylococcal?

Shiga toxin is more lethal than staphylococcal enterotoxin. The parenteral route is the preferred portal entry for Shigella bacteria. More organisms of Staphylococcal bacteria must be ingested to cause infection, as compared Shigella bacteria. Staphylococcal enterotoxin is the more lethal of the two toxins. a.

What is the role of endotoxins in the body?

Endotoxins induce host cells to produce effective antitoxins that help to protect them against the toxin's effects.

How does an individual contract a gastrointestinal infection?

An individual contracts a gastrointestinal infection by consuming contaminated water.

Which neurotoxin causes uncontrollable muscle contractions?

tetanus toxin: an A-B neurotoxin that causes uncontrollable muscle contractions. streptococcal erythrogenic toxin: a superantigen that damages capillaries and results in a characteristic rash. Vibrio enterotoxin: a superantigen that destroys epithelial cells.