Medicine: Against Smallpox

Anybody who has been recently and properly vaccinated, by a doctor who checked the injection site to make sure the shot "took," is most unlikely to get smallpox. But when smallpox erupts where many people have never been vaccinated, or were vaccinated too long ago, doctors face a dilemma. A crash program of vaccination and revaccination may help, but nearly always there are victims already infected for whom this is too late. Gamma globulin has reduced the severity of many cases, but the stuff is scarce, costly, and seldom available where it is needed.

An international team of researchers has just reported...

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