SARS-struck nations step up surveillance efforts.
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D002170:Canada / Q000453:epidemiology; D002681:China / Q000453:epidemiology; D006078:Government Programs; D006291:Health Policy; D006801:Humans; D009313:National Health Programs; D045169:Severe Acute Respiratory Syndrome / Q000453:epidemiology* / Q000517:prevention & control; D014944:World Health Organization