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Top AIDS scientists were optimistic Wednesday of finding a cure for the disease that has claimed 30 million lives -- but said it might not work for all people.

The experts have high hopes for a treatment that will be given at an early stage of infection -- most likely a cocktail that includes an immunity booster and a virus killer.

But they said people with a long-running, untreated infection and a compromised immune system may never benefit from an envisioned "functional cure" -- which means a person retains traces of the virus but no symptoms.

"We have had some very interesting little lights at the end of the tunnel in individual studies," Anthony Fauci, director of the US National Institute of Allergy and Infectious Diseases, said on the sidelines of a Paris conference to mark the 30th anniversary of the discovery of HIV, the virus that causes AIDS.

"It is a difficult road, but a feasible road," he said.

Proof of vaccine feasibility lay with a Thai study dubbed RV144, which in 2009 demonstrated protection for 31 percent of some 16,000 people given an experimental vaccine, said Fauci.

"I think we will likely have a (vaccine that works at) better than 31 percent, but there's certainly the possibility that we won't have a 90 percent," Fauci told reporters.

"And I think there is even a greater possibility that we won't have a pristine cure that would essentially cure everybody who is HIV infected.

"I think it's not only possible that that won't happen -- I think it is likely that that won't happen."

Fauci and other scientists point to the difficulties they have encountered to completely expunge the virus that destroys the immune system and exposes infected people to pneumonia, TB, and other opportunistic disease.

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AIDS scientists optimistic of AIDS cure, for some