Lambeth has London’s highest amount of people suffering from HIV, according to new research.
More than 13 people per 1,000 are believed to have the dangerous infectious disease in the borough - the capitals average is 5.24 per 1,000.
Despite having the country’s highest infection rates, quality of care in the capital is high, according to the Health Protection Agency. 80 per cent seen in an HIV clinic within a month of diagnosis and 93 per cent of those receiving care for more than a year having a restored immune system.
Just four local authorities have infection rates below the threshold of two cases per 1,000.
Dr Brian McCloskey, London director of the HPA, said an estimated one in four people with HIV are unaware they have the virus, and a third of cases are diagnosed late.
"Our advice to Londoners is to practice safe sex and always use a condom with new and casual sexual partners as this is the best way to prevent sexually transmitted infections, including HIV," he added.
"We also advise people who are at higher risk of HIV in London – such as men who have sex with men and black Africans – to get tested for HIV annually.
"Being aware of your HIV status will improve your survival and reduce the risk of transmission to partners."
HPA recommends routine testing for the disease of all adults admitted to hospital or registering with a GP.