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Chimpanzee adenovirus10/7/2023 ![]() ![]() Your immune system is able to use this information to design a defense, making it better equipped to fight the live virus. This means that actual virus particles or genetic materials are combined with other materials to introduce small, harmless pieces of the virus into your body. Unlike the Pfizer and Moderna vaccines that use mRNA technology (pieces of COVID’s genetic code) to create immunity, the AstraZeneca and Sinovac vaccines use a more traditional route. ![]() Vaccination in general works by using small bits of information about a disease - like a protein spike or inactivated virus particle - to teach your immune system how to recognize and destroy the active virus. In one report, investigators report that 97 to 100 percent of people who received the vaccine in clinical trials developed antibodies to COVID-19, but not all of the immune response markers measured in other studies were investigated for the CoronaVac vaccine.Īnother report on the effectiveness of CoronaVac reveals that phase 3 clinical trial results have yet to be released by Sinovac, but a trial in Chile shows an effectiveness rate of just 56.5 percent after full vaccination with CoronaVac. AstraZeneca used these two percentages to average an effectiveness rate of 76 percent.ĭata on Sinovac’s CoronaVac vaccine is limited since a number of international studies on the vaccine are still underway. While AstraZeneca claimed that the vaccine was 70-percent effective, it was later disclosed that the effectiveness was 62 percent in people who received two full doses, and closer to 90 percent in people who received one half and one full dose. There was some controversy over the effectiveness of AstraZeneca’s vaccine in late 2020 when it was revealed that some people in the early study groups only received half doses of the vaccine. Both the AstraZeneca and Sinovac vaccines are still undergoing clinical trials across the globe, so there is some uncertainty as to how effective each vaccine is against COVID-19.
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