In addition to exposure to germs or pathogens, what other factors influence your risk of getting an infectious disease

Risk factors for infectious diseases:

Having a weak or compromised immune systemTaking medications such as steroids or immuno-suppressantsHaving HIV or AIDSNot being vaccinated against an infectious diseaseHaving cancer or a disorder that weakens the immune systemBeing malnourished

Explanation:

Apart from exposure to germs, certain other factors increase the risk of contracting an infectious disease.

Compromised or Suppressed Immune system:

A compromised or suppressed immune system means that your immune system cannot effectively fight against pathogens. The immune system can either be weak naturally, due to malnourishment, undernourishment or be compromised by certain disorders or medication.Immunosuppressants are drugs that suppress or inactivate the immune system. These are prescribed to patients with auto-immune disorders (a disorder in which the body's own immune system starts attacking the body's own cells and organs).

HIV/AIDS

Since HIV attacks an important component, the T-helper cells of the immune system, HIV positive or AIDS individuals have a weak immune system that lowers their ability to fight diseases.

Not Vaccinated:

Vaccination increases a body's capability to fight deadly infections. Un-vaccinated individuals are at a higher risk of contacting diseases.