Theory of contagion was first given by
Fracastorius, an Italian physician enunciated the 'theory of contagion'. He envisaged the transfer of infection minute invisible paicles and explained the cause of epidemics. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 5
Paracelsus
Fracastorius
Vesalius
Pare
Concept of health and disease