Epidemiology is the study of factors affecting the health and illness of populations. The specialist is called an epidemiologist.
An epidemiologist is a specialist in the study of disease in populations.
Virologist
Gerontologists are specialists in the study of diseases of the elderly.
A pediatrician.A pediatricianPediatricians are medical doctors that specialize in dealing with children.
A neurologist is a specialist in the study of the nervous system, including the brain and spinal cord.
Epidemologist
An orthopedist is the medical specialist who treats diseases and disorders of muscles.
One who devotes himself to some specialty; as, a medical specialist, one who devotes himself to diseases of particular parts of the body, as the eye, the ear, the nerves, etc.
An Imunologist works on preventing communicable diseases. A Nutritionist works on preventing dietary deficiency diseases. An Internist is a physician who works on preventing the beginning of or the negative effects of preventable diseases and chronic diseases.
A hematologist is the name for a scientist or physician who studies blood and its diseases. See the link below.There are many diseases that can be found in the blood such as anemia, malaria,and Thelassemia.
Cardiologist. (Also, cardiovascular surgeon and vascular surgeon.)
The study of the rectum, anus and colon is called proctology.
A skin specialist is a "dermatologist".