* Airborne transmission: Airborne transmission is the spread of infection by droplet nuclei or dust in the air. Without the intervention of winds or drafts the distance over which airborne infection takes place is short, say 10 to 20 feet. * Arthropod transmission: Arthropod transmission takes place by an insect, either mechanically through a contaminated proboscis or feet, or biologically when there is growth or replication of an organism in the arthropod. * Biological transmission: Involving a normal biological process, e.g., passing a stage of development of the infecting agent in an intermediate host. Opposite to mechanical transmission. * Contact transmission: The disease agent is transferred directly by biting, sucking, chewing or indirectly by inhalation of droplets, drinking of contaminated water, traveling in contaminated vehicles. * Cyclopropagative transmission: The agent undergoes both development and multiplication in the transmitting vehicle. * Developmental transmission: The agent undergoes some development in the transmission vehicle. * Fecal-oral transmission: The infectious agent is shed by the infected host in feces and acquired by the susceptible host through the ingestion of contaminated material. * Horizontal transmission: Lateral spread to others in the same group and at the same time; spread to contemporaries. * Propagative transmission: The agent multiplies in the transmission vehicle. * Vertical transmission: From one generation to the next, perhaps transovarially or by intrauterine infection of the fetus. Some retroviruses are transmitted in the germline, i.e. their genetic material is integrated into the DNA of either the ovum or sperm.
Epidemic
Epizootic
Endemic 
Pandemic
Toxoid
Acute 
Pre-medical
Infodemic