Why strengthen COVID-19 vaccine? How many ways can COVID-19 vaccine strengthen immunity?

1. Why should COVID-19 vaccine be strengthened? How many ways can COVID-19 vaccine strengthen immunity?

Recently, the COVID-19 epidemic occurred in several provinces and cities in China. Vaccination is the best way to prevent COVID-19. The results showed that with the passage of time, the neutralizing antibody level of people who had completed basic immunization decreased obviously, and timely strengthening immunization could make the gradually decreasing neutralizing antibody increase or rebound rapidly, thus producing better protection effect.

There are two kinds of vaccines in COVID-19: homologous booster immunization and sequential booster immunization.

2. What is "homologous booster immunization"?

Homologous booster immunization is the use of vaccines with the same technical route as basic immunization. For example, a dose of inactivated vaccine can be used as the third injection to strengthen immunity.

People over 8 years old who have been vaccinated with adenovirus vector vaccine for 6 months 1 dose shall be given adenovirus vector vaccine for booster immunization1dose.

3. What is "sequential immunization"?

Sequential booster immunization is to select vaccines with different technical routes from the original vaccine. Based on the inactivated vaccine against Newcastle disease, the third dose of recombinant protein vaccine or adenovirus vector vaccine can be used for booster immunization.