British Prime Minister Boris Johnson has called for leaders of the Group of Seven (G7) rich nations to make a commitment to vaccinate the entire world against Covid-19 by the end of 2022 when they meet in Britain next week.

“Vaccinating the world by the end of next year would be the single greatest feat in medical history,” Johnson said in a statement. “I'm calling on my fellow G7 leaders to join us to end this terrible pandemic and pledge we will never allow the devastation wreaked by coronavirus to happen again,” Reuters quoted him as saying.

While the richest nations have been vaccinating large numbers of their populations, many poorer countries have not had the same access to vaccines. And health experts have warned that unless more Covid shots were donated, the virus will continue to spread and mutate.