US FDA has now approved the Moderna coronavirus vaccine for emergency use a week after authorising the Pfizer vaccine. US has already begun a mass rollout of the Pfizer coronavirus vaccine as it authorised the Moderna vaccine as well to battle the surge in coronavirus cases. <br /> <br />US President Donald Trump took to Twitter to laud the effort and said, “Congratulations, the Moderna vaccine is now available!” <br /> <br />Watch this report for more.