Adenovirus vector vaccines

Adenovirus vector vaccines use a harmless virus (adenovirus) modified to carry genetic material from a target virus, like COVID-19. When injected, the adenovirus delivers this genetic code into your cells, prompting your immune system to recognize and fight the real virus if encountered later. The adenovirus itself does not cause illness. These vaccines are effective, stable at refrigerated temperatures, and have been used successfully in several COVID-19 vaccines such as Johnson & Johnson's and AstraZeneca's. They harness a safe delivery system to activate your immune defenses without causing disease.