MODES OF INFECTIOUS DISEASE TRANSMISSION
An infectious disease must be transmitted from either a reservoir or a portal of exit to another host's portal of entry. Transmission can occur by numerous modes that are somewhat arbitrary categorized into three groups: contact transmission, vehicle transmission, and vector transmission.
CONTACT TRANSMISSION
Direct Contact Transmission: including person-person spread, typically involves body contact between hosts. Touching, kissing, and sexual intercourse are involved in the transmission of such diseases as warts, herpes, and gonorrhea.
Indirect Contact Transmission: occurs when pathogens are spread from one host to another by fomites, which are inanimate objects that are inadvertently used to transfer pathogens to new hosts.
Droplet Transmission: pathogens can be transmitted within droplet nuclei (droplets of mucous) that exit the body during exhaling, coughing, and sneezing.
VEHICLE TRANSMISSION
The spread of pathogens via air, drinking water, and food, as well as bodily fluids being handled outside the body.
Ex. Airborne Transmission, Waterborne Transmission, and Foodborne Transmission
VECTOR TRANSMISSION
Are animals that transmit diseases from one host to another.
Ex. Biological Vectors and Mechanical Vectors
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