Dr. Sanjay Gupta is probably the most famous health reporter in the world.
As CNN's medical correspondent, the Atlanta-based neurosurgeon has covered everything from the war in Iraq to the rising popularity of medicinal cannabis.
But nowadays, he's preoccupied by the novel coronavirus, which has led to an explosion in COVID-19 cases across America.
This week, he put out an informative, 16-part Twitter thread about COVID-19 vaccines.
Check it out below.