Bayan watanni shida na farko bayan alurar riga kafi suna ba da kariya kusan kashi 85 cikin dari, wanda ya ragu zuwa kashi 50 ko 62 cikin dari a cikin shekara ta farko. Bayan shekaru biyu matakin kariya ya ragu zuwa ƙasa da kashi 50. Lokacin da aka ba da isasshen yawan jama'a, zai iya kare waɗanda ba a yi musu rigakafi ba (wanda aka sani da rigakafin garke). Hukumar Lafiya ta Duniya (WHO) ta ba da shawarar yin amfani da allurar rigakafin cutar kwalara tare da wasu matakan a cikin waɗanda ke cikin haɗari. Tare da allurar rigakafin baki, ana ba da shawarar allurai biyu ko uku. Tsawon kariya yana da shekaru biyu a cikin manya da watanni 6 a cikin yara masu shekaru 2<unk>5 shekara. Ana samun rigakafin guda ɗaya ga waɗanda ke tafiya zuwa yankin da aka saba da cutar kwalara.
Ƙarƙashin ƙasa