Ciwon Kankara cuta ce mai saurin yaduwa kuma sau da yawa cuta ce mai saurin kisa daga kwayar cutar variola. Ana kamuwa da cutar ta iska ko kuma ta hanyar saduwa da fata ko ruwan jikin mai cutar kai tsaye. An san ciwon sanyi da zazzabi, ciwon kai, da kurji wanda ke tasowa daga papules zuwa pustules zuwa scabs. Cutar cuta ce mai saurin yaduwa da aka kawar da ita a duniya a shekara ta 1980 ta hanyar yakin allurar rigakafi ta duniya karkashin jagorancin Hukumar Lafiya ta Duniya.