Historical Article

Has horsepox become extinct?

Vet. Rec. 2013 Sep 21; 173 (11): 272-3.
Letter

An Early American Smallpox Vaccine Based on Horsepox.

N. Engl. J. Med. 2017 Oct 12; 377 (15): 1491-1492.
Historical Article

Risks and benefits of vaccinia vaccine use in the worldwide smallpox eradication campaign.

Res. Virol. 1989 Sep 1; 140 (5): 465-6; discussion 487-91.