<prompt> Fingqa isihloko: Ucwaningo olusha lusikisela ukuthi ingculaza yavela kuma-gorilla kanye nakuma-chimpanzee. Amaqembu amabili kulawo amane awaziwayo amagciwane abangela lesi sifo aye alandelwa emuva ezinkawini ezinkulu ezihlanganyela cishe amaphesenti angu-98 e-DNA yazo nabantu. Kwase kwaziwa ukuthi igciwane le - simian immunodeficiency virus SIV - elilingana ne - HIV ezimfeneni - lalisuke kuma - chimpanzee laya kubantu, kodwa manje kubonakala sengathi nama - gorilla aseCameroon nawo adlala indima ebalulekile. Ososayensi bathi ukuqonda imvelaphi yalesi sifo kuyosiza ekubikezeleni ingozi yokuqubuka esikhathini esizayo. Ososayensi baye bathola ukuthi kungenzeka ukuthi ingculaza yaqala emagorileni asezindaweni eziphansi ezisentshonalanga eCameroon, kanye namaqembu ama - chimpanzee kulelo zwe. Lolu xhumo lwatholakala ngemva kokuba abacwaningi behlaziye amasampula omkhuhlane atholakala emahlathini akude. Bathola ukuthi amaqembu e-HIV-1 aziwa ngokuthi i-O ne-P avela emagorileni asezindaweni eziphansi ezisentshonalanga. Igciwane lesandulela-ngculaza i-HIV-1 - elibangela ingculaza - liye lahlasela abantu izikhathi okungenani ezine. Eminye imigqa, M no N, yaziwa ngokuthi yaqala emiphakathini yezimfene ehlukene ngokwendawo eningizimu yeCameroon. Iqembu elithi M laqala ubhadane lwengculaza - olwathelela abantu abangaphezu kwezigidi ezingu-40 emhlabeni wonke ngokusakazeka kulo lonke elase-Afrika nakulo lonke izwe. Ososayensi bathola ukuthi amaqembu e-HIV-1 aziwa ngokuthi i-O ne-P avela emagorila asezindaweni eziphansi ezisentshonalanga. Umfanekiso womqondo weseli elinegciwane le - HIV ubonisiwe. Ngakolunye uhlangothi, amaqembu N noP, atholakala kuphela kubantu abambalwa baseCameroon. Kodwa i-O - nakuba ingasakazekanga futhi ingandile njenge-M - nokho iye yathinta abantu abangaba ngu-100 000 entshonalanga ye-Afrika emaphakathi. Leli qembu lahlolisisa amasampula omchamo wamagorila asezindaweni eziphansi ezisentshonalanga, asezindaweni eziphansi ezisempumalanga, nawasezintabeni eCameroon, eGabon, eDemocratic Republic of Congo nase-Uganda ukuze lithole ubufakazi bezinhlobo ze-SIV - izandulela-ngculaza. Incwadi entsha ithi ubhadane lwengculaza lwaqala ehlathini lemvula eliseningizimu-mpumalanga yeCameroon ngo-1908 futhi ngemva kweminyaka engaphansi kuka-70 lapho igciwane laqala ukubonwa ekuqaleni kwawo-1980. Ukuze...  <response>: Ososayensi bathole isandulela segciwane lengculazi kuma-gorilla aseCameroon. Igciwane elifana nezinhlobo ezimbili ze-HIV ezaziwa ngokuthiOnoPezitholakala kuma-gorilla. Ngaphambilini ososayensi babelibone leli gciwane emaqenjini ama-chimpanzee kuphela. Ochwepheshe bakholelwa ukuthi igciwane lezinkawu laxhuma kubantu ababezizingela. 