A paramedic rests behind his ambulance, as ambulance staff wait hours for the Covid-19 patients they are transporting to be admitted, at Siglo XXI National Medical Center in Mexico City, Thursday, Jan. 7, 2021.

A paramedic rests behind his ambulance, as ambulance staff wait hours for the Covid-19 patients they are transporting to be admitted, at Siglo XXI National Medical Center in Mexico City, Thursday, Jan. 7, 2021.

© AP Photo/Rebecca Blackwell