Paris - One in five South African clinics are running short of life-saving HIV/Aids drugs, affecting nearly half a million people and undermining the success of the world's largest treatment programme, medical charities said on Thursday.
With about six million people infected with the virus - more than 10% of the population - South Africa carries the world's heaviest HIV/Aids caseload and has around 2.5 million people taking antiretroviral (ARV) drugs daily.
However, the huge numbers are causing the system to creak, health researchers say.
Medical charity Médecins Sans Frontières surveyed more than 2 300 of the country's 3 800 public health facilities and found that one in five had either run short or run out of drugs in the previous three months.
Of the affected clinics, catering for 420 000 patients, 20% said they had had to turn away patients, putting the effectiveness of the ARV treatment plan at risk, MSF said.
"The sheer scale of the problem shows stock-outs to be one of the principal barriers to maintaining an effective treatment programme," said Anele Yawa of the Treatment Action Campaign, an HIV/Aids advocacy group that took part in the research.
The health ministry acknowledged some problems but said MSF was exaggerating the situation.
"When you are running a project as big as this, you're likely to have some challenges," said health ministry spokesperson Joe Maila.
"We accept there's a problem but the level at which they pitched it is an extreme over-exaggeration."
A year ago, South Africa awarded a R6 670m two-year contract to pharmaceutical firms including Aspen Pharmacare , Abbott Laboratories and Adcock Ingram to supply HIV/Aids medication.