The WHO director-general says a massive policy failure allowed mosquito control to lapse in the '70s.
CDC officials said fewer than a dozen birth defects and miscarriages have been reported in pregnant women who were infected with Zika virus.
The detection has triggered more efforts to beef up surveillance and testing capacity in African countries.
In other developments, new community engagement programs are under way in the Americas, including a superhero-themed campaign aimed at kids.
Elsewhere, the WHO rates the Zika threat to Europe as low to moderate.
In addition, Germany notes its first case of sexual transmission, and Argentina reports its first local cases.
$25 million is available to help states and territories fight Zika virus.
Also, Chinese researchers noted more findings from infected fetal mice showing extensive damage in developing brains., and US funding efforts made some strides.
Study results show the virus crosses the placenta and extensively damages fetal brains, and the outbreak strain in the Americas appears worse than in Africa.
The new guidance offers clinicians a longer period for testing for Zika virus during the acute illness phase.
