Which of the following is Gram negative

Options :
  1. Salmonella
  2. Pseudomonas
  3. Vibrio
  4. All of these
Answer and Explanation :-

Answer: Option 4

Explanation:

About 75% of known bacteria are Gram negative eg. Salmonella, Pseudomonas, Vibrio, Helicobacter, Haemophilus, Escherichia etc.

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