Hong Kong experienced a severe wave of SARS-CoV-2 in early 2022. Here, the authors use genomic and serosurveillance data and show that this wave was dominated by the Omicron BA.2 sublineage, and that low protective immunity, particularly in older age groups, contributed to its severity.
- Lin-Lei Chen
- Syed Muhammad Umer Abdullah
- Kelvin Kai-Wang To
