Cells of the immune system Tuberculosis. epidemiology person, place, time graph Trauma epidemiology person, place, time graph Stroke epidemiology person, place, time graph Sexually transmitted diseases (st ds) epidemiology person, place, time graph Pneumonia.epidemiology person, place, time graph Malaria disease epidemiology person, place, time graph Hypertension.epidemiology person, place, time graph Hiv disease epidemiology person, place, time graph Hepatitis epidemiology person, place, time graph Hepatitis – b ,epidemiology person, place, time graph Diabetes epidemiology person, place, time graph 
