Zika researchers seeking volunteers

Wanted: Volunteers willing to be infected with the Zika virus for science.

It may sound bizarre, but researchers are planning just such a study - this winter, when mosquitoes aren't biting - to help speed development of much-needed Zika vaccines.

The quest for a vaccine began less than a year ago as Brazil's massive outbreak revealed that Zika, once dismissed as a nuisance virus, can harm a fetus' brain if a woman is infected during pregnancy.