Chain of Infection

chain of infection

Reservoir or Host

The moist, warm, dark place or person in which the infectious microorganisms reside. This is the beginning.

Portal of Exit

The nose, mouth, eyes, urinary tract, reproductive system, and open wounds are some possible routes. This is second

Mode of transmission

Pathogens travel via direct and indirect contact, droplets, or through air. This is third

Portal of Entry

Possible routes include the nose, mouth, urinary tract, reproductive system, eyes, and open wounds. This is fourth

Susceptible Host

Depends on the age and resistance of the individual. The very young, the elderly, and the already ill are the most susceptible. This is last before the cycle starts over.