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The cause of a 28-year-old Irkutsk laboratory worker's death remains unconfirmed as the WHO presses Moscow for information and experts weigh whether pneumonic plague was involved.
Danish researchers will withhold the recommended birth dose of hepatitis B vaccine from thousands of newborns in Guinea-Bissau after an ethics committee approved the study, prompting four resignations in protest.
Two decades of data from England, the US and the Netherlands show several cancer types becoming more common in people under 50, and scientists are still working out why.
