U.S. biotechnology companies Moderna Inc. and Pfizer Inc. said Monday they have started final-stage clinical trials of potential coronavirus vaccines each involving 30,000 participants.The announcements come as the administration of U.S. President Donald Trump is pouring massive investment into efforts to deliver millions of doses of a vaccine for the highly contagious virus by January next year, under what it calls "Operation Warp Speed."Moderna reported earlier this month in a U.S. medical journal that an experimental vaccine proved generally safe and provoked immune responses in all 45 p…READ FULL ARTICLE
