Among the key players in the hunt for safe and effective COVID-19 vaccines are tens of thousands of people who’ve participated in clinical trials for the drugs. A number of them received placebo or dummy drugs. The question is, should they be given the real vaccines once they're cleared for emergency use? It’s a thorny issue.
Placebo or dummy drugs, which often make up half the drugs administered in clinical trials, help scientists determine whether vaccines are safe and effective, work that often lasts several years. Only then are studies unblinded.
CGTN’s Hendrik Sybrandy reports from the state of Colorado.