A report issued Tuesday (4-2) by the World Health Organization found that weekly injections of testosterone, the male sex hormone, can reduce the sperm count to a level below that which is needed for conception. Studied over two and a half years in nine countries, the weekly injections proved effective for contraception in 98.6 percent of the couples involved. The 399 men involved in the study were all healthy, and their ages ranged from 21 to 45. Only four pregnancies occurred during the test period.
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