A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. It contains an agent resembling a disease-causing microorganism, often in weakened or killed form, or its components. The vaccine stimulates the immune system to recognize the agent as a threat and develop immunity, enabling it to destroy the agent and protect against future encounters with the associated microorganism. The safety and effectiveness of vaccines have been extensively studied and verified.
In 1928, a Staphylococcus infection resulting from a lack of preservatives in a diphtheria vaccine led to the deaths of 12 out of 21 children inoculated.
In 1931, Alice Miles Woodruff and Ernest Goodpasture documented that the fowlpox virus could be grown in embryonated chicken egg.
In 1935, eggs were used for virus propagation in the development of a yellow fever vaccine.
In 1945, eggs were used for virus propagation in the development of an influenza vaccine.
In 1958, the United States experienced a significant measles outbreak, with 763,094 cases reported and 552 deaths.
In 1959, growth media and cell culture replaced eggs as the standard method of virus propagation for vaccines.
In 1990, in preparation for the Persian Gulf campaign, the whole cell pertussis vaccine was used as an adjuvant for anthrax vaccine to produce a more rapid immune response.
In 1999, marker vaccines were coined as DIVA vaccines. The first DIVA vaccines and companion diagnostic tests were developed by J. T. van Oirschot and colleagues.
In 2001, a study identified an issue with dengue vaccines, where the DEN-3 serotype was found to dominate and suppress the response to DEN-1, -2, and -4 serotypes.
As early as 2003, the idea of vaccine production via transgenic plants was identified.
As of 2005, the only childhood vaccine in the U.S. that contains thiomersal in greater than trace amounts is the influenza vaccine, which is currently recommended only for children with certain risk factors.
In 2005, bananas were developed that produce a human vaccine against hepatitis B.
In 2006, a vaccine was introduced against shingles, a disease caused by the chickenpox virus, which usually affects the elderly.
In early 2008, there were 64 suspected cases of measles, with 54 of those infections linked to importation from another country. It was noted that 63 of the 64 individuals either had never been vaccinated against measles or were uncertain whether they had been vaccinated.
As of 2009, the human papillomavirus vaccine is recommended in the UK.
As of 2011, the human papillomavirus vaccine is recommended in the U.S.
In 2013, 70% of vaccine sales are concentrated in the EU or US, with the companies having the highest market share in vaccine production being Merck, Sanofi, GlaxoSmithKline, Pfizer and Novartis.
Since at least 2013, scientists have been trying to develop synthetic third-generation vaccines by reconstructing the outside structure of a virus.
In 2016, a DNA vaccine for the Zika virus began testing at the National Institutes of Health. Separately, Inovio Pharmaceuticals and GeneOne Life Science began tests of a different DNA vaccine against Zika in Miami.
In 2019, the World Health Organization characterized vaccine hesitancy as one of the top ten global health threats.
In the year 2020, mRNA vaccines such as BNT162b2 were developed with the help of Operation Warp Speed and massively deployed to combat the COVID-19 pandemic.
During the COVID-19 pandemic in 2021, the World Trade Organization and governments around the world evaluated whether to waive intellectual property rights and patents on COVID-19 vaccines to increase access and production.
In 2021, Katalin Karikó and Drew Weissman received Columbia University's Horwitz Prize for their pioneering research in mRNA vaccine technology.
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