DISEASE EPIDEMIOLOGY. Dr . A.K.AVASARALA MBBS, M.D. PROFESSOR & HEAD DEPT OF COMMUNITY MEDICINE & EPIDEMIOLOGY PRATHIMA INSTITUTE OF MEDICAL SCIENCES, KARIMNAGAR, A.P.. INDIA: +91505417 avasarala@yahoo.com. PROMPT. DISEASE IS STILL A MYSTERY SOME DISEASES KILL AND SOME WONT KILL