Zika virus could infect up to four million, WHO predicts.
D000569:Americas / Q000453:epidemiology; D004196:Disease Outbreaks / Q000517:prevention & control*; D058872:Epidemics / Q000706:statistics & numerical data*; D006801:Humans; D017410:Practice Guidelines as Topic; D014944:World Health Organization; D000071243:Zika Virus Infection / Q000453:epidemiology*