Epidemics means rapid spread of disease to a large number of people in a given population within a short period of time. An epidemic may be restricted to one location; however, if it spreads to other countries or continents and affects a substantial number of people, it may be termed a pandemic. The terms "epidemic" and "outbreak" have often been used interchange. In ayurvedic classic Samhita this term epidemic is described under context of Janapadodhvans. Commentator chakrapani has explained two types of hetu(causative factor)for disease in the context of clarification of Janapadodhvans adhyaya after Trividhkukshi adhyaya. First is asadharan hetu i.e .common morbidity factors among the individuals with dissimilar constitution diet(aahar),physique(Bala),vitality (saatmya),mental health (mana)and age( aayu). Second hetu is common factors which get affected result in simultaneous outbreak of diseases having similar symptoms that destroy communities called as sadharan hetu. These common factors are vayu(air)udak water) desh (land) and kala (season). Yuddha(war), Nuclear bomb, biological war etc. are manmade calamities are also causative factors for Janapadodhvans. Considering above concepts, a detailed review is done from Ayurvedic classics and possible framework in regard to concept of epidemic pandemic and preventive measures in Ayurveda.
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