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The flu vaccine: a high-stakes gamble

Every year, two different vaccines are proposed - one for the northern hemisphere winter, one for the south.


IT is a high-stakes gamble with thousands of human lives on the line. Yet twice a year, every year, the UN's World Health Organization (WHO) bets on the flu - which virus types are likely to dominate in the coming season? On this basis, a vaccine is prepared months in advance....

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