Lars E. Christiansen

TL;DR: It is concluded that Omicron BA.2 is inherently substantially more transmissible than BA.1, and that it also possesses immune-evasive properties that further reduce the protective effect of vaccination against infection, but do not increase its transmissibility from vaccinated individuals with breakthrough infections.

TL;DR: In this article , the transmission dynamics of SARS-CoV-2 Omicron subvariants BA.1 and BA.2 within households were estimated using nationwide Danish data.

TL;DR: Evidence is provided that Omicron BA.2 reinfections do occur shortly after BA.1 infections but are rare, mostly in young unvaccinated individuals with mild disease not resulting in hospitalization or death.

TL;DR: In this paper , the Omicron SARS-CoV-2 variant overtook the previously dominant Delta variant, but the extent to which this transition was driven by immune evasion or a change in the inherent transmissibility is currently unclear.

TL;DR: Evidence is provided that a previous omicron infection in triple-vaccinated individuals provides high amounts of protection against BA.5 and BA.2 infections, which are important to assess the public health impact associated with its rapid global spread despite vaccination.