Experts say COVID-19 booster shots may be necessary

The U.S. is inching closer to President Biden’s July 4 vaccination goal. Nearly 40% of the population is fully vaccinated — but as Nikki Battiste reports, health experts say we may need booster shots in the future. Dr. Stella Safo, an internal medicine physician, joins CBSN’s Lana Zak with her analysis. Source