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April 7. By April 7, the B.1.1.7 variant had become the dominant COVID-19 strain in the U.S. April 9. On April 9, the U.S. passed 31 million cases. April 12. On April 12, the U.S. reported its first six cases of a new "double mutant" SARS-CoV-2 variant from India (B.1.617) in California. April 22
The COVID-19 vaccination campaign in the United States is an ongoing mass immunization campaign for the COVID-19 pandemic in the United States. The Food and Drug Administration (FDA) first granted emergency use authorization to the Pfizer–BioNTech vaccine on December 10, 2020, [7] and mass vaccinations began four days later.
Members of the Illinois Air National Guard assemble medical equipment at the McCormick Place Convention Center in response to the COVID-19 pandemic in Chicago. April 8, 2020. On April 9, Hancock, Pulaski, and Schuyler counties reported their first confirmed cases. On April 10, Fulton and Greene counties announced their first confirmed cases.
SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2), the virus that causes COVID-19, was isolated in late 2019. [1] Its genetic sequence was published on 11 January 2020, triggering an urgent international response to prepare for an outbreak and hasten the development of a preventive COVID-19 vaccine.
Over the course of the COVID-19 pandemic, COVID-19 vaccine mandates have been enacted by numerous states and municipalities in the United States, and also by private entities. In September 2021, President Joe Biden announced that the federal government would take steps to mandate COVID-19 vaccination for certain entities under the authority of ...
The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. The first human case in the United States was on 21 January 2020. The World Health Organization declared the COVID-19 outbreak a Public Health Emergency of International Concern (PHEIC) on 30 January 2020, and first referred to it as a ...
The Oxford–AstraZeneca COVID‑19 vaccine is used to provide protection against infection by the SARS-CoV-2 virus in order to prevent COVID-19 in adults aged 18 years and older. [1] The medicine is administered by two 0.5 ml (0.017 US fl oz) doses given by intramuscular injection into the deltoid muscle (upper arm).
A COVID‑19 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 ( COVID‑19 ). Prior to the COVID‑19 pandemic, an established body of knowledge existed about the structure and function of coronaviruses causing ...