A COVID19 vaccine is a vaccine intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 (COVID19).
Prior to the COVID19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing diseases like severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). This knowledge accelerated the development of various vaccine platforms during early 2020. The initial focus of SARS-CoV-2 vaccines was on preventing symptomatic, often severe illness. In 2020, the first COVID19 vaccines were developed and made available to the public through emergency authorizations and conditional approvals. Initially, most COVID19 vaccines were two-dose vaccines, with the sole exception being the single-dose Janssen COVID-19 vaccine. However, immunity from the vaccines has been found to wane over time, requiring people to get booster doses of the vaccine to maintain protection against COVID19.
The COVID19 vaccines are widely credited for their role in reducing the spread of COVID19 and reducing the severity and death caused by COVID19. According to a June 2022 study, COVID19 vaccines prevented an additional 14.4 to 19.8 million deaths in 185 countries and territories from 8 December 2020 to 8 December 2021. Many countries implemented phased distribution plans that prioritized those at highest risk of complications, such as the elderly, and those at high risk of exposure and transmission, such as healthcare workers.
Common side effects of COVID19 vaccines include soreness, redness, rash, inflammation at the injection site, fatigue, headache, myalgia (muscle pain), and arthralgia (joint pain), which resolve without medical treatment within a few days. COVID-19 vaccination is safe for people who are breastfeeding.
13.42 billion doses of COVID19 vaccines have been administered worldwide based on official reports from national public health agencies.
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In immunology, an adjuvant is a substance that increases or modulates the immune response to a vaccine. The word "adjuvant" comes from the Latin word adiuvare, meaning to help or aid. "An immunologic adjuvant is defined as any substance that acts to accelerate, prolong, or enhance antigen-specific immune responses when used in combination with specific vaccine antigens." In the early days of vaccine manufacture, significant variations in the efficacy of different batches of the same vaccine were correctly assumed to be caused by contamination of the reaction vessels.
Serum Institute of India (SII) is an Indian biotechnology and biopharmaceuticals company, based in Pune. It is the world's largest manufacturer of vaccines. It was founded by Cyrus Poonawalla in 1966 and is a part of Cyrus Poonawalla Group. The Serum Institute of India was founded in 1966 in the city of Pune, India. The company set out to produce immunobiological's, which were imported into India at high prices. Among the first products the Serum Institute of India manufactured in large quantities were the tetanus antitoxin, snake antivenom, DPT vaccine, and MMR vaccine.
Original antigenic sin, also known as antigenic imprinting, the Hoskins effect, or immunological imprinting, is the propensity of the immune system to preferentially use immunological memory based on a previous infection when a second slightly different version of that foreign pathogen (e.g. a virus or bacterium) is encountered. This leaves the immune system "trapped" by the first response it has made to each antigen, and unable to mount potentially more effective responses during subsequent infections.
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