Doctors say Zion Harvey's successful double-hand transplant maps a potential road for future patients.

A government task force says more research is needed to determine if toddlers should be screened for autism even if check-ups or parents haven't spotted developmental problems — despite guidelines from other health groups that urge such screening.

Pamphlets and awareness campaigns may not be enough to counter anti-vaccination claims. What's the next step for doctors and health officials?