| Diseases | Test |
|---|---|
| Rickettsial Infections | |
| Rocky Mountain spotted fever, typhus (murine, scrub, epidemic, and recrudescent) | Weil-Felix reaction (Proteus antigen test) |
| Salmonella Infections | |
| Typhoid and paratyphoid fevers | Widal's test (O and H antigen tests) |
| Brucella Infections | |
| Cattle, hog, goat (Hosts may transmit infections to humans.) | Brucella agglutination test (slide agglutination test) |
| Tularemia | |
| Rabbit fever and deer fly fever | Tularemia agglutination test (tube dilution test) |