The vaccines administered in Switzerland are safe and effective. As is the case with all medications, vaccines can cause side effects. They are usually mild and of short duration.
Common side effects include:
- Reaction at the injection site such as pain, redness and swelling
- Headache, fatigue
- Muscle and joint pain
- General symptoms such as shivering, feeling feverish or temperature
Cases of nettle rash have been reported after a booster vaccination, and a possible link is currently being investigated.
In very rare cases, severe side effects may occur, such as an allergic reaction. Such a reaction usually occurs immediately after the vaccination and is easy to treat. In individuals with a history of severe allergic reactions, appropriate precautionary measures must be observed in the event of a vaccination.
In very rare cases, inflammation of the heart muscle or the pericardium has been observed shortly after vaccination with an mRNA vaccine (usually within 14 days). The majority of these cases were mild and could be treated effectively. Typical symptoms of heart muscle inflammation are chest pain, shortness of breath, fatigue and palpitations. Consult your doctor immediately if you experience such symptoms. Inflammation of the heart muscle or pericardium also occurs after infection with the coronavirus.
In isolated cases, rare types of blood clot (particularly in veins in the brain and abdomen, and in the arteries) have been observed within the first three weeks of vaccination with the Janssen viral vector vaccine. These incidents were severe, but only occurred in very rare cases (in between one and eight in 1 million people) after vaccination with the Janssen viral vector vaccine.
Apart from this, no serious side effects have been reported in the studies conducted or by the persons who have been vaccinated since. Any possible side effects are being monitored by specialists on an ongoing basis.
Severe side effects must be reported to the authorities. The Swissmedic reporting office assesses any reports and, if concerning patterns emerge (e.g. an increase in specific reports), initiates an investigation into a possible correlation with the vaccine.
Further information on reports of suspected adverse reactions to the authorised vaccines can be found on the Swissmedic website.