Juana Méndez gives Patricia Maza a flu shot at a mobile vaccination unit in San Cristóbal de Las Casas, Chiapas, Mexico. “I come every year to get the flu vaccine, and since the COVID-19 pandemic started, I’ve been thinking it’s essential for me to come and get the vaccine,” Maza says. “Imagine it now with the cold weather. I can’t get sick with the flu and COVID-19. That would be a very risky situation.”