1. Which environment will enteric bacteria grow best in? Aerobic or Anaerobic? Why? 2. E. coli...

1. Which environment will enteric bacteria grow best in? Aerobic or Anaerobic? Why?

2. E. coli - Are the enterotoxins endotoxins or exotoxins?

3. How will you differentiate between E. coli and Proteus in a lab?

4. Identify two differences and similarities with salmonellosis.

Solutions

Expert Solution

Q1 answer-enteric bacteria can grow in aerobic and anaerobic conditions.because

they are facultative in nutrition grow in oxgen presence or absence.

they are oxidase negative ,reduce nitrate to nitrite and gram negative.

Q2 answer-

E.coli produces exotoxins, endotoxins and enterotoxins.

Q3 answers-

Mac Conkey’s medium : E. coli ferments lactose whereas, Proteus vulgaris doesn’t ferment lactose. Therefore, E. coli produces pink colonies and Proteus vulgaris produces colourless colonies.
Urea medium : Proteus vulgaris produces urease enzyme and converts urea to ammonia. This reaction changes the colour of the medium from yellow to pink. E. coli gives a negative test as it doesn’t produce urease enzyme.

Q4 answer-

S. typhimurium and S. enteritidis. Some types of Salmonella bacteria causes food poisoning.

Certain bacteria in the group Salmonella cause salmonella food poisoning. These bacteria live in the intestines of humans and animals. Human infection results when food or water that has been contaminated with infected feces is ingested.

A gastrointestinal salmonella infection usually affects the small intestine. It is also called salmonella enterocolitis or enteric salmonellosis. It’s one of the most common types of food poisoning.

gladiator answered 1 year ago

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