RT @DHSCgovuk: Vaccines go through several stages of lab tests and clinical trials before they can be approved for use.

Regulators review the results of these trials to check whether a vaccine meets the required levels of safety and effectiveness.

More info:
https://t.co/f1Ov6eU2WM https://t.co/6iQemmaMAM

from http://twitter.com/NHSuk/status/1328340815656136705