NBC: The World Health Organization says there is "no public health justification" for postponing or canceling the Rio Summer Olympics because of the Zika outbreak in Brazil.
The assessment, in a statement early Saturday, came a day after 150 health experts issued an open letter to the U.N. health agency calling for the games to be delayed or relocated "in the name of public health."
Friday's letter cited recent scientific evidence that the Zika virus causes severe birth defects , most notably babies...