Chengdu Bio and Beijing Kexing are both good, because Chengdu Bio and Beijing Kexing are both listed by the state. Among them, Chengdu Bio is responsible for the bottling and packaging of some Beijing biological vaccines. The vaccination certificate shows that the column of "manufacturer" is "Chengdu Bio" or other manufacturers, but the vaccine injections are all produced by Beijing Bio, so they belong to the same vaccine. The differences between Chengdu Bio and Beijing Kexing are as follows:

1. Difference between Chengdu Biology and Beijing Kexing

(1. 1) The comprehensive effective rate of Cheng (Jing) Bio-COVID-19 vaccine for all age groups and inpatients with symptoms was 79%.

(1.2) Kexing COVID-19 vaccine can prevent 5 1% of the vaccinators from developing disease symptoms, and prevent 100% of the study population from developing severe COVID-19's disease and hospitalization.

2. The difference between Chengdu Biology and Beijing Kexing II.

(2. 1) On 28th day after biological inoculation, the neutralizing antibody against COVID-19 was close to 100%, and the neutralizing antibody turned positive to 99.52%, and the protective effect against diseases caused by COVID-19 was over 79% and close to 80%.

(2.2) Within 28 days after inoculation with two doses of Buxing vaccine, the effective rate of preventing COVID-19 infection was 94%, the prevention rate of infection death was 100%, and the prevention rate of hospitalized cases was 96% after inoculation for 7 days.

3. The difference between Chengdu Biology and Beijing Kexingsan

(3. 1) Chengdu Bio-COVID-19 Vaccine is packaged by Chengdu Institute of Biological Products, one of the largest research and production bases of biological products in China, and belongs to China Biotechnology Group Company, an important state-owned backbone enterprise managed by the State Council State-owned Assets Supervision and Administration Commission. The vaccine can produce antibodies after the first dose 10.

(3.2) Kexing vaccine is an inactivated vaccine produced by Beijing Kexing Zhongwei Biotechnology Co., Ltd., named Kelaifu.