Experts in the United States expressed doubts about the Russian COVID-19 vaccine: "It's doubtful if they've proven the vaccine safe; we don't want to endanger masses of people."
Dr. Anthony Fauci expressed concern that the Russian vaccine does not meet medical standards: "If we wanted to take a risk on people's lives - we could give vaccines as early as next week."
The World Health Organization claims 28 vaccines are in the experimental phase on humans around the world.