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Abstract

The mRNA vaccine Comirnaty and the inactivated vaccine CoronaVac are both available in Hong Kong’s COVID-19 vaccination programme. We observed waning antibody levels in 850 fully vaccinated (at least 14 days passed after second dose) blood donors using ELISA and surrogate virus neutralisation test. The Comirnaty-vaccinated group’s (n = 593) antibody levels remained over the ELISA and sVNT positive cut-offs within the first 6 months. The CoronaVac-vaccinated group’s (n = 257) median antibody levels began to fall below the cut-offs 4 months after vaccination.

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/content/10.2807/1560-7917.ES.2022.27.2.2101197
2022-01-13
2022-06-30
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2022.27.2.2101197
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