(Here's one aspect worth looking at....the deadly strain emerges just
before annual Retrovirus Conference)...mdp

Aspects of Drug-Resistant HIV Strain Make It Especially Deadly, Doctors
Say

By Jeff Donn Associated Press Writer
Published: Feb 24, 2005

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BOSTON (AP) - Research on a recently discovered HIV strain shows it
holds an array of disturbing traits that help it quickly progress to
full-blown AIDS while resisting drug treatments, doctors said Thursday
at the leading meeting on AIDS science.

The variant, discovered in a New York City patient, may have raced from
infection to full-blown AIDS in as little as four months, doctors said
at the 12th Annual Retrovirus Conference. Typical strains can take 10
years to progress to full-blown AIDS.

Many new infections are resistant to treatment with common HIV drugs,
and a small number of HIV variants have quickly progressed to the
disease. But the New York patient's doctors said the case combines both
characteristics in a worrisome way.

"The unique feature of this case is the convergence of ... the
transmission of a remarkably drug-resistant HIV-1 variant and the
extremely rapid clinical course to AIDS," the patient's doctors said in
a review of his case.

The team is led by Dr. David Ho at Rockefeller University in New York.

Aspects of the HIV variant suggest it is especially deadly. It is
capable of using both main entry points to infect cells, and it grows
well in the lab, unlike most drug-resistant strains. It also causes
cells that it infects to clump together, allowing them to kill other
uninfected cells.

The patient, in his late 40s, was diagnosed in December and has lost 10
pounds in the past three weeks alone. It took him between four and 20
months to develop AIDS, Ho said.

Lab tests showed the patient was resistant to three of the four classes
of AIDS drugs. He is taking other AIDS drugs now in the hope of
vanquishing the infection.

Scientists are still trying to find the source of the man's disease.
New York City health authorities have alerted doctors and begun to
trace the patient's sexual contacts. The patient, whose name has been
withheld, had unprotected anal sex with many other men, often in
conjunction with methamphetamine use.

Some researchers have suggested that the patient may simply be
unusually susceptible to AIDS, but his doctors said they have found no
sign that his immune system is particularly vulnerable.

San Diego health officials have said they are studying a similar strain
found there in a patient.

"We don't know whether this is a single isolated event or whether in
fact there are other cases out there," said Ho, who is a paid
consultant to ViroLogic Inc., which makes resistance tests.

Up to 950,000 people have the AIDS virus in the United States. About
18,000 die annually.

AP-ES-02-24-05 2154EST