Britain is on a pace to give the first shot of a two-dose coronavirus vaccine to its entire population by the end of June, if it can avoid supply and logistical issues that threaten to slow one of the world’s fastest rollouts.

The most vulnerable will get their first doses much sooner — probably over the next two weeks — which could drastically reduce deaths. People over 70, nursing home residents and workers, health and social care workers, and those whose health problems make them extremely vulnerable are all on schedule to receive their first vaccine shots before Feb. 15. Together, these groups have accounted for 88 percent of all Covid-19 deaths…

As of Wednesday, Britain had vaccinated more than 15 percent of its population, a higher proportion than anywhere in the world, aside from Israel and the United Arab Emirates. The United States was about 8 percent, and the European Union was below 3 percent.