<unk>  (HHT) is an epidemiologic vector, especially in case the disease is borne by individuals known as superspreaders. In these cases, the basic reproduction number of the virus, which is the average number of additional people that a single case will infect without any preventative measures, can be as high as 3.9. Interhuman transmission is a synonym for HHT. The World Health Organization designation of a pandemic hinges on the demonstrable fact that there is sustained HHT in two regions of the world.
Human-to-human transmission
Airborne transmission
Human pathogen
Vertical transmission
Contagious disease
Natural reservoir
Intentional contagion of infection
Free-living Amoebozoa infection