Every year, supposedly safe municipal water supplies causeoutbreaks of enteric illness.a. How in the course of water analysis and treatment might thesepathogens be missed?b. Why is there less tolerance for a fecal coliform in drinking orrecreational water than for other bacteria?
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Every year, supposedly safe municipal water supplies cause
outbreaks of enteric illness.
a. How in the course of water analysis and treatment might these
pathogens be missed?
b. Why is there less tolerance for a fecal coliform in drinking or
recreational water than for other bacteria?
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- 1. . Does a positive presumptive test mean that the water is absolutely unsafe to drink? Explain. 2. Describe the appearance of coliforms on Levine EMB agar. 3.. List five characteristics of coliform bacteria.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)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 sources
- Identify the microorganism/ group of microorganisms involved in the spoilage of the following food: a.. Canned curdled evaporated milk b. Blue cottony growth on orangesPropionibacterium 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 normal and beneficial but also be pathogenic?Explain whether the MacConkey agar plate inoculated with good water would show the presence of coliforms or not.
- a.) Infection with this pathogen can result in a wide range of diseases from ear infections to meningitis. Group of answer choices Haemophilus influenzae Francisella tularensis Enterococcus faecalis Naegleria fowleri b.)As with all microbial control methods, the _______ the cells are exposed, the ______ damage accumulates. Group of answer choices longer, less shorter, more longer, more c.) Which of the following wavelengths would NOT be considered ultraviolet radiation? Group of answer choices 360 nm 200 nm 600 nm 25 nmIdentify the microorganism/ group of microorganisms involved in the spoilage of the following food: a. Salmon pink discoloration of sauerkraut b. Blue cottony growth on oranges c. Canned curdled evaporated milkWhat are the implications if your drinking water is contaminated with coliforms? And give three examples of disease caused by coliform infection.
- 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.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.Savlon Extra” disinfectant is known to exhibit good antimicrobial activity against Shigella dysenteriae. At 20oC a concentration of 5% v/v kills 2.0 x106 Sh. dysenteriae cells in 15 minutes. At 25oC the organisms were killed in 5 minutes. a) Calculate the temperature coefficient of Savlon Extra b). How long will it take the same concentration to kill the same number of Sh. dysenteriae cells at 30oC?