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London • Health experts on Friday urged the World Health Organization to consider whether the Rio de Janeiro Olympics should be postponed or moved because of the Zika outbreak.

The 150 experts — including former White House science adviser Dr. Philip Rubin — 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."

The letter cited recent scientific evidence that the Zika virus causes severe birth defects, most notably babies born with abnormally small heads. Several public health academics have previously warned that having hundreds of thousands of people head to the Aug. 5-21 games in Brazil will lead to the births of more brain-damaged babies and speed up the virus' global spread.

Doping tests • Nearly two dozen athletes tested positive in reanalysis of their doping samples from the 2012 London Olympics, adding to the more than 30 already caught in retesting from the 2008 Beijing Games.

The International Olympic Committee said Friday that 23 athletes from five sports and six countries had positive findings in retests with improved techniques on 265 samples from the London Games. The IOC did not identify the athletes, their sports or their nationalities.