If you are referring to Covid Vaccine from Pfizer than it was developed in cooperation with Turkish-German with firm run by Greek.This is simple. 20%-ish of Chinese workers are subsidence farmers as opposed to ~0% of the U.S. population: then if you look at US firms - there simply are no Chinese equivalents of the size and scope of U.S. firms like Microsoft, Oracle, Linde, Air Products and Chemicals, ThermoFisher Intel, Pfizer, Nvidia, AMD, Boeing, etc and countless other innovative manufacturers and service firms. China simply lacks the multiplicity of large technologically complex firms that the U.S. contains in droves - that drives the technological frontier more than anything else and can easily explain the productivity differential.
and there is no practical difference between the three vaccines but Sputnik was earliest and i dont think Russia has exported the updated version. Arabs have good idea who produce bad mechanical engineering products post covid either population is unhealthy or covid vaccine has bad after effects.
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