Experts are warning against pushing out a treatment before testing has shown it’s both safe and effective. Past vaccine disasters show why they’re right.

Vaccine experts are warning the federal government against rushing out a coronavirus vaccine before testing has shown it’s both safe and effective. Decades of history show why they’re right.

Vaccine experts are warning the federal government against rushing out a coronavirus vaccine before testing has shown it’s both safe and effective. Decades of history show why they’re right.