RFK Jr., Gov Shapiro clash over Pennsylvania measles outbreak

Fox News contributor Dr. Stephanie Widmer discusses measles transmission rates and synthetic opioid risks on 'America's Newsroom.'

Fox News contributor Dr. Stephanie Widmer analyzes measles transmission rates and synthetic opioid risks on 'America's Newsroom.' Widmer details the percentage thresholds for herd immunity and explains emergency department administration of naloxone for drug toxicity.