The level of immunity induced by infection with different SARS-CoV-2 Omicron sub-lineages against infection with other sub-lineages is not known. Here, the authors use data from Qatar and show that infection with BA.1 induces strong protection against infection with BA.2, and vice versa, for several weeks.
- Hiam Chemaitelly
- Houssein H. Ayoub
- Laith J. Abu-Raddad
