Immunogenicity of Oxford-AstraZeneca COVID-19 vaccine in Vietnamese healthcare workers

We studied the immunogenicity of Oxford-AstraZeneca COVID-19 vaccine in 554 Vietnamese healthcare workers who were naive to SARS-CoV-2 infection. Neutralizing antibodies increased after each dose. The sero-conversion rate reached 98.1% after dose 2. Btu at month 3, neutralizing antibodies decreased. The requirement for a third dose warrants further research.