What is the history of cowpox?
Emma Johnson
Updated on February 28, 2026
Although cowpox originates on the udder of cows, Jenner took his sample from a milkmaid, Sarah Nelmes. Jenner extracted the pus of one of the lesions formed by cowpox on Nelmes to James Phipps, an eight-year-old boy who had never had smallpox. He eventually developed a scab and fever that was manageable.
What is cowpox disease?
cowpox, also called vaccinia, mildly eruptive disease of cows that when transmitted to otherwise healthy humans produces immunity to smallpox. The cowpox virus is closely related to variola, the causative virus of smallpox.
Who discovered the cowpox virus?
In May 1796, Edward Jenner found a young dairymaid, Sarah Nelms, who had fresh cowpox lesions on her hands and arms (Figure 3). On May 14, 1796, using matter from Nelms’ lesions, he inoculated an 8-year-old boy, James Phipps.
What is the causative agent of cow pox?
Cowpox is caused by the cowpox or catpox virus, a member of the orthopoxvirus family, which also includes smallpox and vaccinia.
How is cowpox transmitted?
Despite its name, the reservoir hosts of cowpox virus are rodents, from which it can occasionally spread to cats, cows, humans, and zoo animals, including large cats and elephants. Transmission to humans has traditionally occurred via contact with the infected teats of milking cows.
Why is it called chicken pox?
Etymology. How the term chickenpox originated is not clear but it may be due to it being a relatively mild disease. It has been said to be derived from chickpeas, based on resemblance of the vesicles to chickpeas, or to come from the rash resembling chicken pecks.
Is cowpox DNA or RNA?
Cowpox is a linear double stranded DNA virus. It is comprised of 222,499 nucleotides. The virus codes only 223 proteins, and has no structural RNAs, or pseudo genes. Its genome content only makes up about 33% and while its codes about 91%.
Why did cowpox work against smallpox?
The smallpox vaccine was the first vaccine to be developed against a contagious disease. In 1796, the British doctor Edward Jenner demonstrated that an infection with the relatively mild cowpox virus conferred immunity against the deadly smallpox virus….MVA-BN.
| Vaccine description | |
|---|---|
| ChemSpider | none |
How does cowpox affect?
Human infections with Cowpox virus remain localized to the skin in otherwise healthy people. Infections generally manifest as large (0.5–2 cm in diameter), painful, ulcerative skin lesions, on the hands or sometimes the face.
How did chickenpox start?
The disease is caused by the varicella-zoster virus that belongs to the a-herpes virus family. Also known as VZV, it is present worldwide and is a highly infectious disease and is typically contracted from person-to-person contact.
Can humans get cowpox?
Human cowpox is a relatively rare zoonotic skin infection mainly present in European countries. Cowpox virus (CPXV) belongs to the Orthopoxvirus genus of the Poxvirus family. Despite its name, the majority of cowpox cases are transmitted to humans from domesticated cats and from rats.
What is cowpox and what causes it?
From Wikipedia, the free encyclopedia Cowpox is an infectious disease caused by the cowpox virus. The virus, part of the genus Orthopoxvirus, is closely related to the vaccinia virus. The virus is zoonotic, meaning that it is transferable between species, such as from cat to human.
How do you become immune to cowpox?
Immunity to cowpox is gained when the smallpox vaccine is administered. Although the vaccine now uses vaccinia virus, the poxviruses are similar enough that the body becomes immune to both cow- and smallpox.
What are the signs and symptoms of cowpox (varicella-zoster virus) infection?
Infection with cowpox virus in humans produces localized, pustular lesions at the site of their introduction into the skin. The lesion is similar to that caused by vaccination, although the inflammatory response is greater. The lesions in humans usually appear on the hands: on the thumbs, the first interdigital cleft, and the forefinger.
What is the incubation period for cowpox?
The incubation period is 9 to 10 days. The virus is prevalent in late summer and autumn. In the years from 1770 to 1790, at least six people who had contact with a cow had independently tested the possibility of using the cowpox vaccine as an immunization for smallpox in humans.
