China: Tests of possibly tainted medical product show no HIV


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China is investigating a manufacturer of medical products following reports that it sold human immunoglobulin for intravenous injection that had possibly been contaminated with HIV, though authorities said tests found no sign of the virus. China has repeatedly vowed tighter oversight and crackdowns on companies and officials after food and drug safety scandals sparked public outrage, such as one last month over expired polio vaccines and another last year over a rabies vaccine. Human immunoglobulin, made with human blood plasma, is used to trea...