Johnson & Johnson’s COVID-19-vaccineTema
How the vaccine works
The Johnson & Johnson vaccine works by strengthening the body’s ability to defend itself against infection with coronavirus (COVID-19).
Prior to its authorisation, the Johnson & Johnson COVID-19 vaccine was tested in major clinical trials with more than 44,000 voluntary trial subjects, and the vaccine demonstrated 67% efficacy against coronavirus. In other words, there were 67% fewer COVID-19 cases among the trial subjects given the real vaccine than among those given a placebo.
Vaccinated people can still get ill if they are exposed to virus, but they will usually have milder symptoms than if they had not been vaccinated.
The vaccine’s benefits for the entire population are fewer hospital admissions, fewer severe disease cases and fewer deaths. The higher the infection rate, the greater the impact of vaccinating people, in overall terms.
One vaccine dose is needed to be fully vaccinated with the Johnson & Johnson COVID-19-vaccine.
Common side effects to expect after vaccination
All vaccines can cause side effects; the Johnson & Johnson COVID-19 vaccine is no exception.
Many of those vaccinated will get mild side effects lasting for a few days such as tenderness where they had the injection, tiredness and headache.
About one in ten are likely to develop a fever.
Mild and moderate side effects, that pass within days, are common after vaccination and usually completely harmless. So, if you develop a mild fever or your muscles ache, this is a sign that your immune system is reacting. There is no need to contact your doctor about this. Further information about the mild and moderate side effects is provided in our information sheet and in the vaccine’s summary of product characteristics at www.ema.europa.eu.
If, on the other hand, you experience serious symptoms after vaccination, you should contact a doctor. Examples are allergic reactions like shortness of breath, swelling of the face or on the neck, and rash.
Please read our information sheet or the product information for details on all the known side effects (see links below).
The Danish Medicines Agency information sheet on AstraZenecas COVID-19-vaccine
Denmark does not use the Johnson & Johnson vaccine in its general COVID-19 vaccination programme.
Since 20 May 2021, it has been possible for Danes to choose vaccination with the Johnson & Johnson vaccine under the optional scheme. Details about the general vaccination programme and the voluntary optional scheme appear from the Danish Health Authority’s guideline on COVID-19 vaccination (in Danish only).