An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
Source: ABMS Guide to Specialties https://www.abms.org/media/194925/abms-guide-to-medical-specialties-2019.pdf