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Early optimism that a vaccine to prevent HIV infection would shortly be forthcoming had waned by the time of the fourth annual international conference on AIDS last year. On the eve of the fifth conference, are prospects any brighter?
Drug injection is one way in which human immunodeficiency virus is transmitted. Health programmes should take into account epidemiological differences between more experienced and new drug injectors.
The detection in 1987 of a supernova in the Large Magellanic Cloud has lead to an estimate of the maximum rate of galactic supernovae so unrestrictive that the best response must be to run neutrino detectors for decades on end.
Elusive infectious agents such as HIV-1 can be detected by nucleic acid hybridization using special probes that are amplified by the enzyme Q-beta replicase as much as a thousand million-fold.
