Please explain difference between infectious disease doctor & a internal medicine doctor? would be do same tests based on symptoms? pros cons?

See below: An infectious disease specialist has 3 years of internal medicine residency and is abim board certified in internal medicine and then completes 2 years of infectious disease fellowship. An internist does not have the additional fellowship training. The internist could be your primary doctor caring for all your medical needs. The id specialist would know more about diagnosing and treating infection.

Infectious disease: Focuses specifically on infections and internists have broader knowledge base.

Not much.: Infectious disease physicians have completed training in internal medicine followed by further training in the field of infectious disease. Internal medicine physicians can treat a wide variety of infectious illnesses. In complicated cases, they refer to infectious disease specialists. The tests ordered depend on the physician himself (experience and impression) rather than the subspeciality.