What Is the Johnson & Johnson COVID Shot?
The Johnson & Johnson COVID shot is a viral vector vaccine that uses a modified adenovirus to deliver instructions for the spike protein of SARS-CoV-2. It was authorized for emergency use in the United States in early 2021. The vaccine was designed to help the immune system recognize and fight the virus that causes COVID-19.
How the Johnson & Johnson COVID Shot Works
Like other COVID-19 vaccines, the Johnson & Johnson COVID shot teaches cells to produce a harmless piece of the spike protein. The immune system then builds a defense against the virus. This process does not change DNA and cannot cause COVID-19. The shot is given as a single dose, which simplifies logistics compared with two-dose regimens.
Safety, Efficacy, and Current Status
Clinical trials showed the Johnson & Johnson COVID shot reduced the risk of severe disease and hospitalization. Real-world data from the CDC confirmed protection against severe outcomes, especially early in the pandemic. In 2023, updated recommendations shifted toward newer mRNA vaccines, and the Johnson & Johnson vaccine is no longer the primary option in the United States. For current guidance, consult the CDC website at https://www.cdc.gov/coronavirus/2019-ncov/vaccines/index.html.
