All the following strains of proteus are used in Weil-Felix reaction Except
Alkali stable polysaccharide, a surface antigen is seen in some rickettsiae and some strains of Proteus bacilli. This is the basis for the Weil-Felix reaction used for the diagnosis of rickettsial infections by the demonstration of agglutinins to Proteus strains OX 19, OX 2, and OX K.Ref: Ananthanarayan; 7th edition; Page no: 413
OX 2
OX 19
OX K
OX O
Bacteriology