Made-in-China COVID-19 Vaccines Lose Appeal With Decreased Effectiveness

Chinese Sinopharm and Coronavac Coronavirus Disease 2019 (COVID-19) shots have been administered in many countries, accounting for approximately 50 percent of doses delivered globally. However, their effectiveness is being questioned, with some studies showing that the immunity provided by two vaccine doses is slowly waning. Both Sinopharm and Coronavac vaccines are inactivated vaccines that make use of dead SARS-CoV-2 viruses. Such vaccines tend to be less potent, as they trigger immune reactions to several viral proteins. In contrast, the newly developed mRNA vaccines, like those from Moderna and Pfizer, target the virus' spike protein that is used by the organism…