Consider the history of the drug AZT, which has seesawed in the public perception from panacea to poison and back again.

His doctor placed him on the antiretroviral drug AZT, which he took every four hours round- the-clock.

Fewer infected babies are being born now because the drug AZT has been found to prevent maternal transmission.

The drug AZT brought his weight back to 165 pounds.

Since then, Johnson has been taking the drug AZT, working out regularly and following a strict diet.

And new studies suggest that taking the drug AZT during pregnancy can reduce the risk to 8 percent.

The credit appears to go to aggressive use of the antiviral drug AZT.

The drug AZT is generally prescribed to delay the progression of the infection.

He immediately began treatment with the drug AZT, taking powerful doses every four hours.

Mr. Knight said he is now taking the drug AZT, and that his health has improved.