After years of hesitation, world health agencies are racing to acquire 100 million doses of a Chinese herbal drug that has proved strikingly effective against malaria, one of the leading killers of the poor. The drug, artemisinin (pronounced are-TEM-is-in-in), is a compound based on qinghaosu, or sweet wormwood. First isolated in 1965 by Chinese military researchers, it cut the death rate by 97 percent in a malaria epidemic in Vietnam in the early 1990s. It is rapidly replacing quinine derivatives and later drugs against which the disease has evolved resistant strains. To protect artemisinin from the same fate, it will be given as part of multidrug cocktails.
