Vaccination Record in 1826

Hello, I am stuck on a German word written on my GGGrandfather's Birth Record in 1826. As a baby, he was  vaccinated with "Kuhblattern"... I believe this was a smallpox vaccination. I know that cowpox may be related to the innoculation against smallpox, hence the word "Kuh"... the good news was that he was found well about 8 months later. If you can help decipher "Kuhblattern" I will be so grateful. Thank you in advance, Claire Desmond-Ward

[Allan Cole]

As you say this while seemingly obvious has a problem. Kuh obviously means cow and the combined word is Kuhblattern . It is not uncommon in German for words to be combined. Though not an expert the word for Smallpox in German is Blättern. So it is not inconceivable that the inoculation may have been Cowpox.
From memory early inoculations were from cowpox as it was noted that milkmaids did not seem to attract Smallpox as easily. So whilst I cannot give you a translation of the word it seems the word if split can be translated.

[Futse]

Hello Claire,
Allan is right.
Kuh = cow
Blattern = old German word for pox
Cowpox (also known as sheep pox) is a mild pox-like disease that mainly affects cattle. Humans can also contract cowpox. Infection usually occurs during milking and is limited to the hands (milker's nodes).

The English physician Edward Jenner (1749-1823) was the first to recognize that people who contracted cowpox were subsequently not only immune to cowpox but also immune to smallpox. He coined the term vaccination (lat. vacca = cow) for the smallpox vaccination and thus became the founder of immunology in 1796.

Translated with DeepL.com (free version)