A cikin rigakafi, kwayoyin halitta sune abubuwan da ke cikin jikin kwayoyin halitta wanda za a iya bambanta su daga kwayoyin halitta na waje ta hanyar tsarin rigakafi. A akasin haka, kwayoyin halitta ba su da wadanda aka gane su a matsayin kwayoyin halitta na waje. Ɗaya daga cikin kwayoyin da ba a san su ba ne ake kira antigens (gajere ga masu samar da kwayoyin halitta) kuma an bayyana su a matsayin kwayoyin da ke haɗuwa da takamaiman masu karɓa na rigakafi da kuma haifar da amsawar rigakafi. Jarirai ba su da haɗuwa da kwayoyin cuta kuma suna da matukar damuwa ga kamuwa da cuta. Yawancin matakan kariya na m sun samar da mahaifiyar. A lokacin daukar ciki, wani nau'i na antibody, wanda ake kira IgG, an kawo shi daga mahaifi zuwa jariri ta hanyar jariri, don haka kwayoyin halittar mutum suna da matakan kwayoyin cutar ta jiki a cikin jarirai, har ma a lokacin haihuwar jariri, ta hanyar kwayoyin halitta na ciki ko ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwaƙwalwar ƙwa
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