The advent of penicillin drugs in the early 1940s ushered in a triumphant era of medicine. With stunning speed, pharmaceutical chemists armed doctors with one antibiotic after another, giving them an arsenal of magic bullets to knock out the germs that cause everything from pneumonia to gonorrhea. It was only a matter of time, it seemed, before all infectious diseases would be conquered.
But now the invisible legions of malevolent microbes are fighting back, and medicine is no longer so confident of winning the battle. Not only have many diseases caused by viruses, such as AIDS, proved to be extraordinarily difficult...
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