That it is conveyed from person to person is an undoubted fact, proved by innumerable cases, and tacitly implied by the word " infectious," which is universally allowed.
Whether due to viruses or bacteria, the infection is spread from person to person by airborne droplets, hand contact or kissing.
The aedes aegypti mosquito carries the virus from person to person.
Warts are contagious from person to person and from one area of the body to another on the same person.
It was also considered to be highly infectious and to spread rapidly from person to person until whole areas were affected.