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COVID-19 Vaccine AstraZeneca is a vaccine for preventing coronavirus disease 2019 (COVID-19) in people aged 18 years and older. COVID-19 is caused by SARS-CoV-2 virus.
COVID-19 Vaccine AstraZeneca is made up of another virus (of the adenovirus family) that has been modified to contain the gene for making a protein from SARS-CoV-2.
COVID-19 Vaccine AstraZeneca does not contain the virus itself and cannot cause COVID-19.
Detailed information about this vaccine is available in the product information, which includes the package leaflet.
How is COVID-19 Vaccine AstraZeneca used?
COVID-19 Vaccine AstraZeneca is given as two injections, usually into the muscle of the upper arm. The second dose should be given between 4 and 12 weeks after the first dose.
How does COVID-19 Vaccine AstraZeneca work?
COVID-19 Vaccine AstraZeneca works by preparing the body to defend itself against COVID-19. It is made up of another virus (adenovirus) that has been modified to contain the gene for making the SARS-CoV-2 spike protein. This is a protein on the surface of the SARS-CoV-2 virus which the virus needs to enter the body’s cells.
Once it has been given, the vaccine delivers the SARS-CoV-2 gene into cells in the body. The cells will use the gene to produce the spike protein. The person’s immune system will then recognise this protein as foreign and produce antibodies and activate T cells (white blood cells) to attack it.
The adenovirus in the vaccine cannot reproduce and does not cause disease.
What benefits of COVID-19 Vaccine AstraZeneca have been shown in studies?
Combined results from 4 clinical trials in the United Kingdom, Brazil and South Africa showed that COVID-19 Vaccine AstraZeneca was safe and effective at preventing COVID-19 in people from 18 years of age. These studies involved around 24,000 people altogether. Half received the vaccine and half were given a control injection, either a dummy injection or another non-COVID vaccine. People did not know if they had been given the test vaccine or the control injection.
The United Kingdom became the first country to approve AstraZeneca’s COVID-19 vaccine for emergency use on Dec. 30, just weeks after Pfizer’s and Moderna’s vaccine candidates received a green light from the Food and Drug Administration in the United States.
How does the AstraZeneca COVID-19 vaccine work?
AstraZeneca’s vaccine uses adenovirus-vectored technology. Translation: It’s a harmless, modified version of a common cold virus that usually only spreads among chimpanzees. This altered virus can’t make you sick, but it carries a gene from the novel coronavirus’ spike protein, the portion of the virus that triggers an immune response. This allows the immune system to manufacture antibodies that work against COVID-19, teaching your body how to respond should you become
Storage and distribution
AstraZeneca’s vaccine is the easiest to transport so far—it can be stored for up to six months between 36 and 46°F, normal refrigerator temperatures. The Moderna and Pfizer options, meanwhile, must be stored at subzero temperatures until they’re ready to be used, at -4°F and -94°F, respectively. (mRNA technology is relatively fragile compared to adenovirus-vectored tech, meaning it must be kept at much lower temperatures to remain effective and stable.)
AstraZeneca’s higher storage temperature could make distribution much easier. “A clinic, a nursing home, or even [regional] health departments may not have freezers that can hold things at -94°F,” says Kawsar Talaat, M.D., an infectious disease doctor, vaccine researcher, and assistant professor in the department of International Health at Johns Hopkins University. Being able to use a typical fridge “allows time for distribution, allows the vaccine time to get to more rural areas, [and allows vaccines] to be kept at a clinic for a longer period of time.”
All three vaccines’ side effects are similar, including potential injection site pain and flu-like symptoms, including fever, fatigue, headaches, and muscle pain, which are to be expected as your immune system is primed.