PCR (initially)
Serial serologic examinations by indirect fluorescent antibody confirm the diagnosis
Titers
ECG (Myocarditis)
Chem 7 (Hyponatremia)
CBC (Thrombocytopenia)
Rocky mountain spotted fever
Other Tick Borne Illnesses
Rat bite fever
Non-specific viral illness
Chikungunya
Psittacosis
Crimean-Congo hemorrhagic fever
Anthrax 