• "I think we can see light at the end of the tunnel" on the pandemic, Pfizer's Albert Bourla told CNBC on Monday.
  • . Dr. Scott Gottlieb told CNBC the vaccine could be available in limited use as early as late December and widely available by the third quarter of 2021.

Pfizer Chairman and CEO Dr. Albert Bourla told CNBC on Monday he believes the world "can see light at the end of the tunnel," after the U.S. pharmaceutical giant announced its coronavirus vaccine was more than 90% effective in preventing Covid-19 for those who had no evidence of previously being infected.

More than 50 million coronavirus infections have been recorded worldwide since the virus emerged in China in late December, according to data compiled by Johns Hopkins University. At least 1,257,747 people have died. Nearly a fifth of all global infections and fatalities are in the U.S. The race to develop a safe and effective vaccine has been closely watched as companies accelerated a process that normally takes years.