What is the best COVID19 vaccine? It's not so simple to decide.

Any effort to rank the #COVID19 vaccines must take into account not only their effectiveness, but also supplies, costs, logistics of deploying them, durability of protection & their ability to fend off emerging #coronavirus variants.

https://www.nature.com/articles/d41586-021-00409-0?utm_source=Nature+Briefing&utm_campaign=d15e33148b-briefing-dy-20210224&utm_medium=email&utm_term=0_c9dfd39373-d15e33148b-43576073