corona covid 19

CoronaVac, also known as the Sinovac COVID-19 vaccine, is an inactivated virus COVID-19 vaccine developed by the Chinese company Sinovac Biotech. It has been in Phase III clinical trials in Brazil, Chile, Indonesia, the Philippines, and Turkey. It relies on traditional technology similar to BBIBP-CorV and BBV152, other inactivated-virus COVID-19 vaccines in Phase III trials. CoronaVac does not need to be frozen, and both the vaccine and raw material for formulating the new doses could be transported and refrigerated at 2–8 °C (36–46 °F), temperatures at which flu vaccines are kept.A real-world study of millions of Chileans who received CoronaVac found it 67% effective against symptoms, reduced hospitalizations by 85%, intensive care visits by 89%, and deaths by 80%. Phase III results from Brazil showed 50.7% efficacy at preventing symptomatic infections and 83.7% effective in preventing mild cases needing treatment. Efficacy against symptomatic infections increased to 62.3% with an interval of 21 days or more between the doses. Final Phase III results from Turkey announced on 3 March 2021 showed an efficacy of 83.5%.CoronaVac is being used in vaccination campaigns by certain countries in Asia, South America, North America, and Europe. In April, Sinovac had a production capacity of 2 billion doses a year and had delivered 260 million doses worldwide. It is currently being manufactured at several facilities in China, with planned overseas manufacture in Brazil in September 2021 and eventually in Egypt.Politicization, transparency issues and some incomplete trial data in Brazil contributed to a lack of trust in CoronaVac there.However, May 2021 reports from real world data in Indonesia, another early adaptor and widespread dispenser of CoronaVac, seem to indicate that the data from Brazil may be flawed.

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