FILE – In this July 21, 2020 file photo, a city health department worker hangs a poster describing the guidelines for businesses operating during the coronavirus pandemic, as a woman prepares to make tortillas inside a small business, in San Mateo Xalpa in the Xochimilco district of Mexico City. Mexican health officials have been holding daily televised news conferences about the pandemic for months, but they have given mixed messages on the necessity of wearing a mask. (AP Photo/Rebecca Blackwell, File)