<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.majaribio ya chanjo hiyo yalifanyika katika chuo kikuu cha witwatersrand lakini yalikuwa bado hayajatathminiwa.  <response>: the vaccine trial was carried out by the university of the witwatersrand but has not yet been peer reviewed. 