Protection Due to Previous SARS-CoV-2 Infection
Description
To the Editor: Although it is true that the effectiveness of previous SARS-CoV-2 infection in preventing reinfection varies across the spectrum that encompasses the B.1.1.7 (alpha), B.1.351 (beta), B.1.617.2 (delta), and B.1.1.529 (omicron) variants