Proteus antigen cross react with:: (A) Klebsiella, (B) Chlamydiae, (C) Rickettsiae, (D) E. coli
Answer is C. Ans. 'c' i.e., Rickettsiae(Ref: Ananthanarayan, 9th/e, p. 410)Proteus antigens (OX19, OX2, OXK Strains) cross reacts with group specific alkali stable lipopolysaccharide rickettsial antigens. The application of this property is done in the Weil Felix (heterophile agglutination) test.