World health boss warns of escalating rate of coronavirus infection across the world

People over age 60 wait in an hours-long line to get the AstraZeneca vaccine, on the day Mexico began vaccinating its elderly population against Covid-19, outside a health centre in the outlying Milpa Alta borough of Mexico City (Rebecca Blackwell/AP)
People over age 60 wait in an hours-long line to get the AstraZeneca vaccine, on the day Mexico began vaccinating its elderly population against Covid-19, outside a health centre in the outlying Milpa Alta borough of Mexico City (Rebecca Blackwell/AP)