Antibodies detected by reacting patient serum with rickettsial antigens,followed by incubation with an anti-immunoglobulin with a fluorescent tag,could be used to diagnose:

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The technique described is indirect fluorescent antibody (IFA) testing which is commonly used to detect antibodies against Rickettsia species in patient serum, including the causative agent of Rocky Mountain spotted fever. Mycoplasma pneumonia can be diagnosed using serological tests such as enzyme-linked immunosorbent assay (ELISA) and complement fixation, but IFA testing is not commonly used. Stomach ulcers and rheumatic fever are not typically diagnosed using antibody testing.

Antibodies Detected by Reacting Patient Serum with Rickettsial Antigens,followed by Incubation