<prompt> Theory of contagion was first enunciated byParacelsusFracastoriusVesaliusPare  <response>: Revival of medicine encompasses period from 1453 -1600. Fracastorius an Italian physician enunciated ;theory of contagion;. He envisaged transmission of infection minute invisible paicles and explained cause of epidemics. He recognised syphilis was transmitted from person to person during sexual relationss. He is founder of epidemiology. Ref: Park;s textbook of preventive and social medicine; 23rd edition; Pg no: 5 