Bill Gates talked about the COVID-19 vaccine.
According to Gates the "final hurdle" to distributing a COVID-19 vaccine will be ensuring that people decide to take it.
Gates said testing vaccine candidates with a wide variety of populations and age groups can prove challenging.
Still, Gates believes that "a lot" of people will take a vaccine when one becomes available.
According to Business Insider the billionaire believes herd immunity can be achieved if 70% to 80% of people take the vaccine.