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Volume 28, Number 9—September 2022
Dispatch

Epidemiology of Infections with SARS-CoV-2 Omicron BA.2 Variant, Hong Kong, January–March 2022

Yonatan M. Mefsin, Dongxuan Chen, Helen S. Bond, Yun Lin, Justin K. Cheung, Jessica Y. Wong, Sheikh Taslim Ali, Eric H.Y. Lau, Peng WuComments to Author , Gabriel M. Leung, and Benjamin J. Cowling
Author affiliations: World Health Organization Collaborating Centre for Infectious Disease Epidemiology and Control, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China (Y.M. Mefsin, D. Chen, H.S. Bond, Y. Lin, J.K. Cheung, J.Y. Wong, S.T. Ali, E.H.Y. Lau, P. Wu, G.M. Leung, B.J. Cowling); Laboratory of Data Discovery for Health, Hong Kong Science and Technology Park, Hong Kong (D. Chen, S.T. Ali, E.H.Y. Lau, P. Wu, G.M. Leung, B.J. Cowling)

Main Article

Figure 2

Age-stratified estimates of the case-fatality risk for COVID-19 in epidemic waves 1–4 and wave 5 in Hong Kong by vaccination status. Case-patients were classified as having a complete primary series if they had received >2 doses of COVID-19 vaccines >2 weeks before symptom onset (for symptomatic case-patients) or >3 weeks before laboratory confirmation of the infection (for symptomatic case-patients with a missing onset date or asymptomatic case-patients), otherwise as having an incomplete primary series. The COVID-19 vaccines available in Hong Kong included BNT162b2 (Pfizer-BioNTech, https://www.pfizer.com) and CoronaVac (Sinovac, https://www.sinovac.com) vaccines.

Figure 2. Age-stratified estimates of the case-fatality risk for COVID-19 in epidemic waves 1–4 and wave 5 in Hong Kong by vaccination status. Case-patients were classified as having a complete primary series if they had received >2 doses of COVID-19 vaccines >2 weeks before symptom onset (for symptomatic case-patients) or >3 weeks before laboratory confirmation of the infection (for symptomatic case-patients with a missing onset date or asymptomatic case-patients), otherwise as having an incomplete primary series. The COVID-19 vaccines available in Hong Kong included BNT162b2 (Pfizer-BioNTech, https://www.pfizer.com) and CoronaVac (Sinovac, https://www.sinovac.com) vaccines.

Main Article

Page created: June 22, 2022
Page updated: August 19, 2022
Page reviewed: August 19, 2022
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