The antigen used in Weil Felix test is obtained from________________?

Correct answer: C. Proteus

  • A. Pseudomonas
  • B. coli
  • C. Proteus
  • D. Staphylococcus

Explanation

Weil-Felix testing uses Proteus strains, especially OX19, OX2 and OXK, because their antigens cross-react with rickettsial antibodies. The other listed bacteria are not used as the test antigen.

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