A new campaign highlighting the four proven ways to prevent HIV has launched to mark World Aids Day. In the face of the ongoing Covid-19 pandemic, the Do It London campaign reminds Londoners of the importance of HIV prevention and offers assurance that they can protect their health from HIV.The ‘four sure’ methods of the combination prevention approach are: testing regularly for the virus; using condoms; using the HIV prevention medicine Pre-Exposure Prophylaxis (PrEP); and, for people who have been diagnosed HIV positive, achieving an ‘undetectable’ viral load through the use of antiretroviral medication.