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HIV/AIDShasclaimedaround35millionlivesworldwide.Butnow,asDrChrisvanTullekenreveals,cutting-edgesciencecankeepthevirusatbayorevenpreventinfectionaltogether.AsanewpreventativetreatmentcalledPrEPisrolledoutontheNHSinScotland,andnewtrialsareannouncedinEnglandandWales,HIVisundercontrol,inBritainatleast,butonlywhenitcanbedetectedandthetreatmentwithantiretroviraldrugs(ARVs)canbegin. Chrismeetsawomanwhosehusbanddiedwithouteverknowinghehadthedisease,bywhichtimehehadinfectedhertoo.ButChrisalsofindsouthow'viralloads'cannowbereducedtoallowpatientstoleadhealthylives-andevenpreventtheminfectinganyoneelse. ChrismeetsHRHPrinceHarryforaninterviewattheMildmayHospital,anHIVhospitalmadefamousbyDiana,PrincessofWales,whereChrisalsomeetsapatientwhoseundetectedHIVledtoseriousbraindamage. Withsevenoutoftenofpeopleinfectedworldwidelivinginsub-SaharanAfrica,DrvanTullekenvisitsaclinicinKwaZulu-Natal,SouthAfrica,wheretensofthousandsarestilldying.Hemeetsaninfectedschoolgirlandrealisesthatlocalattitudestotestingarestillleadingtounnecessarydeaths.ButChrisalsomeetsclinicianstakingmasstestingouttothevillagesandmeetsamanwhoselifewassavedasaresult. BackintheUK,talkofacuremaybepremature,butChrisfindsoutmoreaboutthecontroversyaroundtherolloutofPrEPwhich,whentakendaily,canpreventsomeonebecominginfectedinthefirstplace.