Infection control

Disease

Coronavirus disease 2019 (COVID-19)

Immunity

Intensive care medicine

Vaccination

Internal medicine

Immunology

Medicine

Confidence interval

Infectious disease (medical specialty)

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)

Immune system

New England Journal of Medicine

The protection conferred by natural immunity, vaccination, and both against symptomatic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection with the BA.1 or BA.2 sublineages of the omicron (B.1.1.529) variant is unclear.

Effects of Previous Infection and Vaccination on Symptomatic Omicron Infections