Most of these side effects were mild and lasted only for 2 days.
In April 2021, received a donation of 90,000 doses from China after granting emergency use authorization on 2 March.
In The Lancet, and colleagues provide timely results of a randomized trial on the reactogenicity and immunogenicity of a homologous and three different heterologous booster vaccines among individuals who had received two doses of the CoronaVac vaccine.
Preliminary results indicate that neutralizing antibodies fell below the seropositive threshold 6 to 8 months after the first two doses, and that a third dose given 6 or more months after the second dose raised neutralizing antibody levels beyond that of an initial course consisting of 3 doses.
In February, Cambodia approved Coronavac for emergency use and started vaccinations in March.
In May, Oman received its first batch of the vaccine.