6 essential factors in infection process of disease?

1. Infectious Agent

The infectious agent is the microorganism or other entity that causes the disease. This can be a bacterium, virus, fungus, or parasite. The infectious agent must be present in the body in sufficient numbers to cause disease.

2. Reservoir

The reservoir is the natural habitat of the infectious agent. This can be an animal, human, or the environment. The reservoir is where the infectious agent lives and multiplies.

3. Portal of Exit

The portal of exit is the way the infectious agent leaves the reservoir. This can be through the respiratory tract, gastrointestinal tract, urinary tract, or skin.

4. Mode of Transmission

The mode of transmission is the way the infectious agent is spread from the reservoir to the host. This can be through direct contact, indirect contact, or airborne transmission.

5. Portal of Entry

The portal of entry is the way the infectious agent enters the host. This can be through the respiratory tract, gastrointestinal tract, urinary tract, or skin.

6. Susceptible Host

The susceptible host is the person or animal who is not immune to the infectious agent and who is therefore at risk of developing the disease.