| |keywords=Vayu (air), udaka (water), desha (land), kala (season),contamination, epidemics, lifespan, daiva (predetermined), purushakara(human effort of present life), Ayurveda, Indian system of medicine, charak samhita. | | |keywords=Vayu (air), udaka (water), desha (land), kala (season),contamination, epidemics, lifespan, daiva (predetermined), purushakara(human effort of present life), Ayurveda, Indian system of medicine, charak samhita. |