Covid vaccine -19

Article

December 1, 2021

COVID Vaccine 2019 (English: COVID ‑ 19 vaccine) are vaccines that are being designed, manufactured or manufactured with the aim of providing acquired immunity against Cronvirus 2019 (Covid. 19). Past efforts to develop vaccines against coronavirus diseases such as acute respiratory syndrome and Middle East respiratory syndrome have increased information on the structure and function of coronaviruses. This information will help scientists design and produce more innovative vaccines against Covid با19 at a faster rate than usual. As of January 2021, there are 69 proposed vaccines in the clinical trial phase, including 43 vaccines in phases 1 and 2 and 26 vaccines in phases 2 and 3. In Phase 3, several proposed vaccines were reported to be 95% effective in preventing Covid-19. As of April 2021, 17 vaccines have been licensed for therapeutic use for injection and general use in at least one country. These vaccines include 2 RNA vaccines (Covid-19 Pfizer vaccine and Covid-19 modern vaccine), 8 inactivated virus vaccines (Cronavac), Sinofarm, Covaccine, Koviran Iran Barakat, Kovivak, Minhai-Kangtai, QazVacVI ), 6 are viral vector vaccines (Sputnik V, Sputnik Light, Johnson & Johnson, Convidecia and Oxford-Astrazenka) and 2 peptide vaccines (EpiVacCorona and RBD-Dimer). Many countries have given priority to vaccines to high-risk populations such as the elderly and those at risk, such as medical staff. According to official statistics, as of June 6, 2021, about 15.2 billion doses of vaccine have been injected worldwide. Pfizer, Moderna and Astrazenka predict that by the end of 2021 they could produce 3.5 billion doses of the vaccine, which could vaccinate about 3 billion people. As of December 2020, more than 10 billion doses of vaccine have been pre-ordered by various countries. About half of these are bought by rich countries, which together make up only 14% of the world's population.

History

As of October 2020, more than 321 candidate vaccines were being developed worldwide, which is 2.5 times more than in April. In November, 56 candidate vaccines were in clinical trials: 41 vaccines in phases 1-2 and 15 to phase 2-3. In November 2020, Pfizer Moderna of the University of Oxford (in collaboration with Astrazenka) announced the positive results of the analysis of the preliminary phase 3 trials of their vaccine. World Health Organization (WHO), a

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