用於診斷傷寒及副傷寒病例的篩選試驗，引起傷寒熱的
沙門氏菌抗原(Sal. typhi, H, Sal typhi 0,Sal  
paratyphi A,Sal. Paratyphi B)，診斷立克次氏菌病
(Proteus OX2,Proteus OXK)其應用於幾種立克次氏病的
鑑別診斷
Disease          OX-19    OX-2    OX-K
Epidemic typhus   ++++    +       -
Murine typhus     +++     +       -    
 Scrub typhus      -      -      +++ 
Spotted fever group++++     +     -
Q fever            -       -      - 
 Rickettsital pox  -       -      -