World, 15 July (Bloomberg)-The biggest vaccination campaign in history is underway. More than 3.51 billion doses have been administered across 180 countries, according to data collected by Bloomberg. The latest rate was roughly 30.5 million doses a day.

In the U.S., 335 million doses have been given so far. In the last week, an average of 548,045 doses per day were administered.

Enough doses have now been administered to fully vaccinate 22.9% of the global population—but the distribution has been lopsided. Countries and regions with the highest incomes are getting vaccinated more than 30 times faster than those with the lowest.