Epidemiology of Infectious Diseases
The infectious disease process results from the interaction of the
epidemiological triad
(agent, host and environment) in a process that involves six components, sometimes referred to as the "chain of infection."
Causative Agent
(7 pages)
Reservoir of Agent
(5 pages)
Portal of Exit of Agent from the Host
(2 pages)
Mode of Transmission
(3 pages)
Portal of Entry
(1 page)
Host Susceptibility
(2 pages)
