U.K., April 10 -- In the world's largest COVID-19 vaccination campaign, more than 726 million doses have been administered across 154 countries, according to data collected by Bloomberg.

The US is in the lead, with around 175 million doses being administered. At this rate, it is estimated to take another three months to cover 75 per cent of the population.

After a break in the vaccination drive in the US over the Easter weekend and end of Passover, the pace has picked up again, with another 3.4 million doses reported on Thursday, bringing the seven-day average to 3.04 million, almost at the record level before the holiday drop off.

According to Bloomberg, the stockpile of AstraZeneca vaccines in America has now risen to more than 20 mi...