[theold]

These studies indicated that the inactivated vaccines were effective against the Delta variant.

In summary, a two-dose of inactivated SARS-CoV-2 vaccine at 0–21 days and 0–28 days regimens significantly improved SARS-CoV-2 neutralizing antibody level compared to the 0–14 days regimen in high-risk occupational population, with seroconversion rates of 100.0%, which to some extent provided a basis for optimizing the immunization strategy of inactivated vaccine against COVID-19 among high-risk occupational population.

https://idpjournal.biomedcentral.com/art...21-00924-2