Medical science has produced no drugs to cure or even treat diseases caused by the small, true viruses. Man's only defense against them is preventive warfare waged with vaccines. But newly won knowledge is broadening and intensifying this prophylactic attack on 14 major and minor diseases. Current status and prospects:

Smallpox. Improved vaccines are being made, some by growing cowpox virus in live calves (the historic method), some in chick embryo, freeze-drying it so that it will ship better and keep longer without refrigeration.

Chicken Pox. Essentially the same virus also causes shingles. First grown in test tubes in 1953 in John F....

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