Kalmar “cutar Kirsimeti” kalma ce ta likitanci da ke nufin wani nau’in ciwon haemofiliya, cuta ce ta kwayoyin halittar da jini ba ya toshewa yadda ya kamata. Cutar Kirsimeti kuma ana kiranta da Hemophilia B, kuma tana faruwa ne ta hanyar ƙarancin clotting factor IX, wanda ya zama dole don jini ya toshe sosai. Kalmar “cutar Kirsimeti” ta fito ne daga sunan majinyacin farko da aka gano yana da wannan cuta, Stephen Christmas, wanda aka gano yana da ita a shekara ta 1952.