VACCINATION :
A COVID-19 Vaccine is a vaccine intended to provide acquired immunity against severe acute respiratory syndrome Corona virus 2 (SARS-CoV-2), the virus that causes the corona virus disease in 2019, (COVID-19). Prior to COVID-19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing disease like severe acute respiratory syndrome (SARS) & Middle East respiratory syndrome (MERS). The COVID-19 are widely credited for their role in reducing the spread, severity, and death caused by COVID-19.
Many countries have implemented phased distribution that prioritize those of higher risk of complications such as the elderly, and those of higher risk of exposure and transmission, such as healthcare workers. Single doze interim use is under consideration to extend vaccination to as many people as possible until vaccine availability is improves.
As of 15th September 2021, 5.82 billion dozes of COVID-19 has been administrated World - Wide based on official reports from National Public Health Agencies. AstraZeneca anticipated producing 3 billion doses in 2021, Pfizer Bio-NTECH 1.3 billion doses and Sputnik V, Sinopharm, Sinovac and Janssen 1 billion doses each. Moderna target producing 600 million doses and Convidecia 500 million doses in 2021. By December 2020, more than 10 billion vaccine doses had been preordered by countries, with about half of the doses purchased by high-income countries comprising 14% of World's population.
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