Diagnosis and treatment of bacterial, viral, and fungal infections, urinary, respiratory, gastrointestinal, skin, and sexual infections. Evaluation and treatment of prolonged fevers and fevers of unknown origin. Vector-borne diseases (mosquito bites, dengue fever, and other travel-related fevers). Periodic check-ups and assessment of general health status. Examination of the immune system and screening for infections. Vaccination and completion of personal immunization schedule (HPV, shingles, hepatitis A and B, travel vaccines). Requesting and interpreting specialized blood tests.