Gupta: Officials question AstraZeneca vaccine trial results. Here's why
Gupta: Officials question AstraZeneca vaccine trial results. Here's why

US health officials have expressed concern over AstraZeneca’s announcement on the company’s latest findings from its coronavirus clinical trial.

The board said AstraZeneca may have included outdated information in relation to their trial.

CNN’s Dr. Sanjay Gupta explains.