swinepox

In the course of his researches he was led to conclude that swinepox, as well as cowpox, was only a variety of smallpox.

He inoculated his eldest son with the matter of swinepox and produced a disease similar to a very mild smallpox.

It is thought to be due to the same virus which in pigs is called swinepox and in horses "grease."

In November, 1789, Dr. Jenner inoculated his eldest child Edward, aged 18 months, with some swinepox virus, and as nothing untoward happened, he inoculated him again with swinepox on April 7, 1791.

It is true that at one time it was not clear what were the relationships of chickenpox and smallpox, of vaccinia and variola, of vaccinia and varioloid, of the various forms of pox in animals—cowpox, swinepox, horsepox or grease—either inter se or to human smallpox.