“Gall gymryd nifer o flynyddoedd, degawdau hyd yn oed, i ddatblygu brechlynnau. Mae’r ffaith bod brechlyn diogel ac effeithiol wedi cael ei ddatblygu mewn llai na blwyddyn yn deyrnged aruthrol i’r holl ymchwilwyr a gwyddonwyr ar draws y byd sydd wedi gweithio’n ddiflino i ddod o hyd i frechlyn ar gyfer COVID-19.
“Vaccines can take many years, even decades, to develop. The fact that a safe and effective vaccine has been developed in less than year is a remarkable tribute to all scientists and researchers around the world who have worked so hard to find a vaccine for COVID-19.