The diagnosis of<unk>  can be made on blood smear as evidenced by the presence of spirochetes. Other spirochete illnesses (Lyme disease, syphilis, leptospirosis) do not show spirochetes on blood smear. Although considered the gold standard, this method lacks sensitivity and has been replaced by PCR in many settings.
Relapsing fever
Tomato fever
Far East scarlet-like fever
Haverhill fever
Pontiac fever
Boutonneuse fever
Spotted fever
Cat Scratch Fever