Proteus antigen cross react with:
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.
Klebsiella
Chlamydiae
Rickettsiae
E. coli
Bacteria