Lokacin da isasshen yawan jama'a ya yi rigakafi, 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 a haɗe da wasu matakan tsakanin waɗanda ke cikin haɗari. Tare da maganin 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 1800 da cutar kwalara ta zama ruwan dare.
shekaru biyu