Britain to infect healthy volunteers with coronavirus in vaccine challenge trials The Washington PostDistribution of COVID-19 vaccines faces hurdles as trials near end CBS NewsCooperation not competition is key to developing a vaccine South China Morning PostStates file their Covid-19 vaccine plans to CDC without plans to pay for them, state health officials say CNNUK taps Open Orphan to explore vaccine trials that infect volunteers with coronavirus CNBCView Full Coverage on Google News