The race to a vaccine

Image used for illustrative purpose. A volunteer receives an injection from a medical worker during first human clinical trial for a potential vaccine against the novel coronavirus, June 24, 2020.

A worker is seen at the facility of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

Sinovac Biotech chairman and CEO Yin Weidong attends a government-organized media tour showcasing the company's development of a coronavirus disease (COVID-19) vaccine candidate in Beijing, China, September 24, 2020.

Robyn Porteous, a vaccine trials' volunteer, is injected with a vaccine as part of the country's human clinical trial for potential vaccines after being tested for the coronavirus disease (COVID-19), at the Wits RHI Shandukani Research Centre in Johannesburg, South Africa, August 27, 2020.

A laboratory monkey used in the development of an mRNA type vaccine candidate for the coronavirus disease (COVID-19) is seen inside its cage at the National Primate Research Center of Chulalongkorn University in Saraburi province, Thailand, June 22, 2020.

A woman works in a laboratory of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

People work in the packaging facility of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

Women work in a laboratory of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

Intern Celeste Pueblas works in a project to find a vaccine for the coronavirus disease (COVID-19), in a lab, in Buenos Aires, Argentina June 18, 2020.

A worker performs a quality check in the packaging facility of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

Image used for illustrative purpose. A worker performs a quality check in the packaging facility of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

A display shows vaccine products of Sinovac Biotech during a government-organized media tour showcasing the company's development of a coronavirus disease (COVID-19) vaccine candidate in Beijing, China, September 24, 2020. Image used for illustrative purpose.

A specialist works at Binnopharm pharmaceutical plant, part of Alium Group owned by Sistema financial corporation, which develops "Gam-COVID-Vac" vaccine against the coronavirus disease (COVID-19) in Zelenograd near Moscow, Russia September 18, 2020.

A nurse carries China's Sinovac vaccine, a potential vaccine for the coronavirus disease (COVID-19), at the Sao Lucas Hospital of the Pontifical Catholic University of Rio Grande do Sul (PUCRS), in Porto Alegre, Brazil August 8, 2020.

A man works in a laboratory of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

A worker is seen at the facility of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020.

A man works in a laboratory of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020. Image used for illustrative purpsoe.

A display shows packages of vaccine candidate for SARS-CoV-2 by Sinovac Biotech during a government-organized media tour showcasing the company's development of a coronavirus disease (COVID-19) vaccine candidate in Beijing, China, September 24, 2020.