Typical job duties include taking patient histories, performing, or requesting diagnostic tests, making diagnoses, prescribing treatment, administering vaccinations and performing follow-up examinations, as well as educating patients in disease prevention and health maintenance. Provide and manage comprehensive medical care, including diagnosis and nonsurgical treatment of diseases, common health problems, such as infections, influenza and pneumonia, as well as serious, chronic, and complex illnesses for patients of all ages.