Can we stretch existing Covid vaccines to inoculate more people? Is the world is using more vaccine than it needs to on each person immunized, depriving people in the queue of a chance to be protected? Helen Branswell STAT

With the global supply of Covid-19 vaccine still woefully inadequate, vaccine makers are scouring the pharmaceutical landscape for partners to ramp up manufacturing, and civil society groups are pressing politicians to waive intellectual property protections in a bid to spur still more production.

Two arthritis drugs, plus steroids, can cut Covid death risk, WHO says For every 100 patients given Actemra from Roche and Kevzara from Sanofi with corticosteroids, four more will survive, according to WHO analysis. NBC News

The World Health Organization on Tuesday recommended using arthritis drugs Actemra from Roche and Kevzara from Sanofi with corticosteroids for Covid-19 patients after data from some 11,000 patients showed they cut the risk of death.