Allergy and immunology deals with problems caused by allergies and other disorders of the immune system. An allergist-immunologist evaluates, diagnoses, and manages disorders of the immune system. Some conditions that this specialist will treat include asthma, rhinitis, eczema, and allergic reactions to drugs, foods and insect bites. Other areas covered by an allergist-immunologist are immune deficiency diseases, problems related to autoimmune diseases, and organ transplantation.

Doctor density varies by specialty and location. The United States has 4,927 practicing allergists & immunologists. Broken out by state, allergy & immunology doctor density in Alabama is 41, in Alaska is 9, in Arizona is 75, in Arkansas is 37, in California is 580, in Colorado is 117, in Connecticut is 90, in Delaware is 21, in District of Columbia is 41, in Florida is 233, in Georgia is 121, in Hawaii is 23, in Idaho is 10, in Illinois is 239, in Indiana is 119, in Iowa is 50, in Kansas is 46, in Kentucky is 82, in Louisiana is 69, in Maine is 15, in Maryland is 151, in Massachusetts is 159, in Michigan is 199, in Minnesota is 94, in Mississippi is 36, in Missouri is 112, in Montana is 9, in Nebraska is 24, in Nevada is 22, in New Hampshire is 29, in New Jersey is 209, in New Mexico is 24, in New York is 421, in North Carolina is 121, in North Dakota is 10, in Ohio is 167, in Oklahoma is 30, in Oregon is 48, in Pennsylvania is 270, in Rhode Island is 19, in South Carolina is 72, in South Dakota is 8, in Tennessee is 88, in Texas is 362, in Utah is 22, in Vermont is 11, in Virginia is 136, in Washington is 97, in West Virginia is 42, in Wisconsin is 116, and in Wyoming is 10.