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Student assignment:
- You are provided with a culture tube of P. aeruginosa, E. coli, Salmonella typhimurium , Shigella flexneri. What biochemical test is more accurate to differentiate them?
- Name the acid base indicator in the TSI test and the colour change for positive reaction. Explain the principle behind TSI test?
- Explain what happens if
a) only glucose is fermented
b) lactose is fermented or
c) no fermentation occurred in a TSI culture tube
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