Question

write a short note on vaccine of covid 19​

Answer 1

Answer:

COVID-19 can be characterized as a pandemic. This is due to the rapid increase in the number of cases outside China over the past 2 weeks that has affected a growing number of countries.

Explanation:

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Answer 2

A COVID‑19 vaccine is a vaccine intended to provide acquired immunity against COVID‑19. Prior to the COVID‑19 pandemic, work to develop a vaccine against the coronavirus diseases SARS and MERS had established knowledge about the structure and function of coronaviruses, which accelerated development during early 2020 of varied technology platforms for a COVID‑19 vaccine.

By January 2021, 69 vaccine candidates were in clinical research, including 43 in Phase I–II trials and 26 in Phase II–III trials.[1] In Phase III trials, several COVID‑19 vaccines demonstrated efficacy as high as 95% in preventing symptomatic COVID‑19 infections. As of January 2021, nine vaccines have been authorized by at least one national regulatory authority for public use: two RNA vaccines (the Pfizer–BioNTech vaccine and the Moderna vaccine), three conventional inactivated vaccines (BBIBP-CorV from Sinopharm, BBV152 from Bharat Biotech and CoronaVac from Sinovac), three viral vector vaccines (Sputnik V from the Gamaleya Research Institute, the Oxford–AstraZeneca vaccine, and the Janssen COVID-19 vaccine), and one peptide vaccine (EpiVacCorona [ru]).