The main difference between Beijing Biotechnology and Kexing is the different R&D companies and manufacturers of the new coronavirus vaccine. Both Beijing Biological and Kexing vaccines are inactivated vaccines for the prevention of diseases caused by new coronavirus infections, both of them have higher safety and better preventive effects, but the main difference is that they are developed by different companies and manufacturers. The main difference is that they are developed by different companies and manufacturers. Beijing Biological Vaccine is developed and manufactured by Beijing Biological Products Research Institute of China National Pharmaceutical Group, while Kexing Vaccine is developed and manufactured by Beijing Kexing Zhongwei Bio-Technology Co. The basic immunization of Beijing Biological and Kexing New Crown Vaccine is 2 doses, and the second dose should be separated from the first dose by 21 days. People who have completed the whole vaccination for more than 6 months (i.e., the second vaccination has been completed for more than 180 days) and are over 18 years old can receive the third booster vaccination. For more information on the specific details of vaccination with Beijing Biologicals and Kexing, it is recommended that you consult your local CDC or vaccination center.