Nakakubo S, Kishida N, Okuda K, Kamada K, et al. Associations of COVID-19 symptoms with omicron subvariants BA.2 and BA.5, host status, and clinical outcomes in Japan: a registry-based observational study. Lancet Infect Dis 2023 Jun 30:S1473-3099(23)00271.
PMID: 37399831