E.coli is part of the normal microbiota of the intestines and can cause gastroenteritis. Explain why this one bacterial species is both beneficial and harmful.
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- Why do you think E. coli and other enteric organisms are common causes of UTIs?Why does Helicobacter pylori cause ulceractions in the lining of the Stomach? 1)The microbes secrete a toxin that prevents the host from detecting invasion of the microbe and thus allows it to thrive in the stomach and damage the host cells. 2)After invasion of the microbe in the cells lining the stomach, they are no longer able to produce mucous to protect the host cells from acid erosion 3)The microbe produces an enzyme that causes the cell to produce potent digestive enzymes that erode the stomach lining. 4)Once the microbe has entered the stomach, it releases digestive enzymes that degrade the mucous secreting cells.The large intestine contains bacteria, such as E.coli, that synthesize vitamin K and some B vitamins and absorbed into the bloodstream. Answer the following questions: 1. Describe the type of symbiosis best represented by E.coli and human large intestine. 2. When can E.coli become potentially pathogenic (disease-causing)? Explain briefly.
- If there is a causal relationship between the presence of H. pylori and ulcers, how might you explain that 50% of the patients with a normal endoscopic examination were infected with the bacteria?Which statement among A-E is false concerning digestive system and gastrointestinal (GI) tract infections? A) O The more severe forms of gastroenteritis, like dysentery, produce abdominal cramps, fever, and blood. B) ORehydration and electrolyte replacement are typically the treatment for those with GI tract infections. C) O Invasive GI tract infections are caused by intracellular pathogens such as Salmonella and certain E coli. D) O Among protozoal pathogens, Giardia is a major cause of gastroenteritis. E) O Most GI tract infections are due to viruses. F) OA-E are all correct.Propionibacterium acnes is a normal member of the skin microbiome that benefits the body by lowering the skin's pH- an antimicrobial effect. However, P. acnes is also the leading cause of acne. Explain mechanistically how can a bacterium be part of the normal microbiome and beneficial but also be pathogenic?
- All of the following pertain to listeriosis, except 1) intrauterine infection usually results in fetal death. 2) enterotoxin of the organism causes symptoms. 3) it causes a serious septicemia and meningitis in the elderly, immunocompromised, and infants. U 4) it causes symptoms of fever, diarrhea, and sore throat. 5) adequate pasteurization and thorough cooking of food can improve prevention.Campylobacter is an extracellular intestinal species that is a true pathogen. Which of the following specifically occur during the establishment and outgrowth stage (step 3) of the bacterial pathogenic process for this species? Tissue destruction to increase nutrient concentrations Production of exotoxins to decrease normal flora populationsCompare and contrast the virulence factors and signs and symptoms of infections with the four main E. coli groups.