FILE - In this May 25, 2020, file photo, a lab technician extracts a portion of a COVID-19 vaccine candidate during testing at the Chula Vaccine Research Center, run by Chulalongkorn University in Bangkok, Thailand. As the race for a vaccine against the new coronavirus intensifies, many rich countries are rushing to the front of the line by placing advance orders for the inevitably limited supply to guarantee their citizens are immunized first. (AP Photo/Sakchai Lalit, File)