A roundup of the most important Covid-19 vaccine news this week — There are still 20 vaccines in phase 3 trials, six approved for limited use, and four approved for full use in some countries after fully completing phase 3 trials. The fully approved vaccines include those from Pfizer/BioNTech, Sinopharm, Sinovac, and Moderna. Others, including the vaccines from AstraZeneca and Russia’s Sputnik…