User:Mr. Ibrahem/Janssen COVID-19 vaccine

Janssen COVID-19 vaccine is a COVID-19 vaccine. It is used in people over the age of 17 to prevent COVID-19. It is given by injection into a muscle. A second dose may be given 2 months after the first. The initial trials found that it decreases the risk of COVID-19 after 2 weeks by 67% and severe disease by 77%.

Most side effects are mild to moderate and resolve within a few days. These may include injection site pain, headache, tiredness, muscle pain, and nausea. Rare side effects may include blood clots, Guillain-Barré syndrome, low platelets, and anaphylaxis. There is no evidence of harm with use in pregnancy. It is a viral vector vaccine, meaning that it is made up of another virus (adenovirus) that has been modified to contain the gene for making the spike protein of the SARS-CoV-2 virus.

The vaccine received emergency use authorization (EUA) in the United States in February 2021 and was approved for medical use in Europe in March 2021. It has been authorized for use at some level in at least 82 countries as of 2022. It was developed by Janssen Vaccines in the Netherlands, and its Belgian parent company Janssen Pharmaceuticals, a subsidiary of American company Johnson & Johnson. The US government paid about 10 USD per dose and provides them for free. The vaccine is stored refrigerated rather than frozen.