In the process of vaccine development, why did China scientists change the traditional tandem mode?

In the process of vaccine research and development, China scientists changed the traditional serial mode to parallel mode.

Vaccine refers to biological products made of various pathogenic microorganisms for preventive inoculation. Among them, vaccines made of bacteria or spirochetes are also called vaccines. Vaccines are divided into live vaccines and dead vaccines. Commonly used live vaccines include BCG, polio vaccine, measles vaccine and plague vaccine. Commonly used dead vaccines include pertussis vaccine, typhoid vaccine, meningococcal vaccine and cholera vaccine.

Different vaccines have different production times:

The production time of different vaccines is different, and some vaccines may take 22 months to produce a batch. The development of vaccine is a long and complicated process with high cost. Vaccination is the most economical and effective public health intervention measure to prevent and control infectious diseases, and it is also an effective means for families to reduce the incidence of diseases and medical expenses.

It is estimated that immunization can prevent 2 million to 3 million people from dying of diphtheria, tetanus, whooping cough and measles every year. In the past few years, the global vaccination coverage rate (the proportion of children receiving recommended vaccines in the world) has remained stable.