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It sounds like a dramatic progress in slowing the virus' spread, but the decline is mostly just on paper.
Previous estimates were largely inflated. The new numbers have been calculated in a different way, and when scrutinised, they reveal that the Aids pandemic is losing momentum.
A decline in deaths
"For the first time, we are seeing a decline in global Aids deaths,"
said Dr Kevin De Cock, director of the World Health Organization's
Aids department.
On Wednesday, the WHO and the United Nations Aids agency will issue their annual Aids report, after convening an expert meeting last week in Geneva to examine their data collection methods.
Much of the global drop in Aids cases is due to revised numbers from India - which earlier this year slashed its numbers in half, from about 6 million cases to about 3 million - and to new data from several countries in sub-Saharan Africa.
UN officials could not rule out future downward corrections. In their assessment of the global Aids epidemic, WHO and UNAIDS experts reported that there were 2.5 million people newly infected with HIV in 2007. Just a few years ago, that figure was about 5 million.
Previous Aids numbers were largely based on the numbers of infected pregnant women at antenatal clinics, as well as a projection of the Aids rates of certain high-risk groups like drug users to the entire population at risk. Officials said those numbers were flawed, and are now incorporating more data like national household surveys.
Regional differences
Yet while the global Aids numbers are falling, there are huge
regional differences. Africa remains the epicentre of the epidemic.
Aids is still the leading cause of death here, affecting men, women and children. Elsewhere in the world, Aids outbreaks are mostly concentrated in gay men, intravenous drug users and sex workers.
But the UN said progress was being made, and that the global epidemic peaked in the late 1990s. "There are some encouraging elements in the data," said De Cock. He said the dropping numbers were proof that some of the UN's strategies to fight Aids were working.
Numbers inflated?
Not everyone agrees. Some critics have accused the UN of inflating
its Aids numbers, and say the revised figures are long overdue.
"They've finally got caught with their pants down," said Dr Jim Chin, a clinical professor of epidemiology at the University of California at Berkeley.
Chin is a former WHO staffer and the author of "The AIDS Pandemic: The Collision of Epidemiology with Political Correctness." Chin said that it was difficult to tell whether the lowered numbers were evidence that Aids treatment and prevention strategies were working, or whether the decrease was just due to a natural correction of previous overestimates.
Even with the revised figures, "the numbers are probably still on the high side," said Daniel Halperin, an Aids epidemiologist at the Harvard School of Public Health. Halperin attended the WHO/UNAIDS meeting last week that reviewed the figures, and said that the estimates were getting closer.
But because big numbers in public health translate into more money, there may be a reluctance among Aids officials to admit that fewer people are infected than they once thought, since that would cut into their funding.
With limited dollars for public health, having good information is key if the global community is to spend its money on the health issues that need it most.
"On the one hand, it would be a mistake to radically decrease funding for HIV," Halperin said. "But on the other hand, why not put more money into family planning or climate change?"
Other experts said that even with the decreased figures, much more is needed to stop the Aids pandemic.
"We are still failing to respond to the crisis," said Dr Paul Zeitz, executive director of the Global Aids Alliance.
"The overall prevalence of Aids may have stabilised, but we are still seeing millions of new infections and it is not time yet to step back from this battle." – (Sapa-AP)
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HIV/Aids Centre
November 2007
