Featured in herd immunity

A sun rising over a mountain in Spain.
People with masks walk through long hallway.
someone getting a COVID-19 vaccine with a mask on.
woman wearing mask covid
The graffiti-marked West Bank wall with a white car in front
CDC Director Robert Redfield and National Institute of Allergy and Infectious Diseases Director Anthony Fauci in 2018
manaus city in amazon
people walking around with masks in the suburbs