Source of Reservoir
Infectious agent: An organism that is capable of producing infection or infectious disease.
A reservoir is defined as " living or nonliving material in or on which an infectious agent multiplies or develops and is dependent for its survival in nature.
1. Human Reservoir
a. Cases - There are a number of important pathogens that are specifically adapted to man, such as: measles, smallpox, typhoid, meningococcal meningitis, gonorrhea and syphilis. The cycle of transmission is from human to human.
b. Carriers - is a person who has become infected with a pathogen, but does not show any signs or symptoms.
2. Animal Reservoir - the source of infection may sometimes be animals and birds.
3. Nonliving things - soil and inanimate matter can also act as reservoir of infection. eg. Tetanus in soil.