Article: Pathogen Transmission

Pathogen Transmission

Pathogens are microorganisms such as viruses, bacteria, protozoa, and fungi that cause disease in humans and other species. Pathogen transmission involves three steps: escape from the host, travel to, and infection of the new host. Pathogen transmission occurs in several ways, usually dependent on the ecology of the organism. For example, respiratory pathogens are usually airborne, while pathogens of the digestive tract tend to occur in food or water. Epidemiologists group pathogen transmission into two general types of contact, direct and indirect, within which there are several mechanisms.

Pathogen transmission by direct contact takes place when an infected ...

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