alastrim /al″əstrim/ [Port, alastrar, to spread] , a mild form of smallpox, with little rash. It is thought to be caused by a weak strain of the poxvirus that causes smallpox. Unlike smallpox, however, alastrim is rarely fatal. Also called Cuban itch, Kaffir pox, milkpox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, whitepox. See also smallpox.