LONDON (Reuters) - The declining wave of pandemic H1N1 flu is likely to be followed by new, unknown strains of seasonal flu which health authorities must watch carefully to devise protection measures, European flu experts said on Friday. A medical assistant holds up a H1N1 flu shot at the Beni Messous Hospital in Algiers December 30, 2009. (REUTERS/Louafi Larbi/Files) The European Centre for Disease Prevention and Control (ECDC) warned that flu viruses "never stand still" and said governments...
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