On Saturday, Victoria's chief health officer said frozen berries had been implicated in past outbreaks of hepatitis A. (abc.net.au)
Past outbreaks of Zika occurred among small populations in the Pacific islands, and uncommon kinds of birth defects were not noticed right away. (washingtonpost.com)
(Immunity in some of those populations from past outbreaks, however, may be protecting them from large epidemics.) (scientificamerican.com)