'Cautious optimism' - J&J vaccine trials underway
'Cautious optimism' - J&J vaccine trials underway

With more than 20 COVID-19 vaccines in clinical trials, the collaboration between Johnson & Johnson and Beth Israel Deaconess in Boston is getting $1 billion in U.S. funding.

Lead researcher Dan Barouch charts the road ahead.

(Produced by Dan Fastenberg)