While it is true that not all coliforms are pathogenic under normal conditions, please name two situations that can occur due to infection by coliforms under abnormal conditions (when they are present where they are not supposed to be or when their numbers exceed acceptable levels)
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While it is true that not all coliforms are pathogenic under normal conditions, please name two situations that can occur due to infection by coliforms under abnormal conditions (when they are present where they are not supposed to be or when their numbers exceed acceptable levels)
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- Based on disease syndromes and characteristics, and also on their effect on certain cell cultures and serological groupings, five virulence groups of Escherichia coli are recognized. Briefly distinguish between these virulence groups. [Base your answer on virulence factors, pattern of bacterial attachment to host cells, effects of attachment to host cells, production of toxins, and invasiveness] What will the appearance of Escherichia coli be on MacConkey Agar red and Eosin Methylene Blue (EMB) agar, respectively.While it is true that not all coliforms are pathogenic under normal conditions, please name two situations that can occur due to infection by pathogenic strains.Resistance to antimicrobial agents is more commonly seen in hospital-acquired infections with enteric bacteria than in community-based infections with the same species. Explain why this is so.
- There have been many cases of human infection with Salmonella caused by contact (or ingestion) with raw or undercooked chicken. This is an example of which type of microbial source for foodborne illness? which option is the answer: 1. Contamination by human microbiota or pathogens during handling & preparation 2. A food animal – infection or colonization during its lifetime 3. Contamination by human or animal feces during growing, harvesting, washing, transport, or storage 4. None of the other four answers are correct 5. Contamination by naturally occurring environmental organisms from soil or other sourcesCampylobacter 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 populationsWhy 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.
- What are the common pathogens isolated from stool samples? What is the difference between a coliform bacterium and a noncoliform enteric bacterium? What diagnostic test differentiates Proteus and Providencia species from other Enterobacteriaceae? How would you differentiate between serotypes of E. coli? Are the gram-negative enteric bacilli fastidious organisms? Would they survive well outside of the body? If so, what significance would this have in their transmission? Why is serotyping particularly important in Salmonella infections and typhoid fever?What are the virulence factors of Salmonella typhi? Explain each factors in simple terms.Which of the following bacterial species is considered normal flora of the mouth? O 1) Streptococcus mutans 2) Escherichia coli 3) Klebsiella pneumoniae 4) Staphylococcus epidermidis
- Explain the role of pylori in the pathogenesis of peptic ulcers. Which populations are most susceptible to peptic ulcers? Is H. pylori normal flora? If so, what causes the species to become pathogenic? Construct at table to compare and contrast the 5 steps of microbial pathogenesis. How does extracellular growth differ from intracellular growth? Diagram the 5 step pathogenesis cycle for coli O157:H7, an extracellular, intestinal pathogen acquired by consuming contaminated food/water. Be sure to include the role of exoenzymes and the Shiga exotoxin in your diagram. (2 points) Explain the pathogenesis of Listeria monocytogenes. Be sure to include temperature regulation, intracellular growth, and at risk groups in your discussion.List three species of Betaproteobacteria that are known to behuman pathogens.Write a 1-2 paragraph case study that accurately depicts the disease caused by Clostridium Botulinum. If your organism is transmitted in a specific location or under certain circumstances be sure your patient has been to those locations or engaged in those behaviors that would lead to transmission Have the appropriate timeline in terms of incubation and length of illness. Cover the important symptoms. You do not have to give all possible symptoms, just the typical one. Provide some important laboratory test results without stating the name of your microorganism. Provide the Epidemiology, Pathogenesis, Clinical Manifestations, Laboratory Tests, Treatment and Prevention.