Side Effects

All vaccinations may cause fever and with that febrile convulsions. Certain mild side effects are seen so frequently that they are considered probable, whereas serious reactions to vaccination are extremely rare

Reporting of side effects

Side effects should be reported to The Danish Medicines Agency.

The Danish Medicines Agency collects and handles reports of adverse reactions in the way that both pharmaceutical companies and authorities of other countries will be informed of possible adverse reactions of medicinal products.

It is the responsibility of the Danish Medicines Agency to make sure that the pharmaceutical industry acts on the adverse drug reactions reported.
Permanent damages should be reported to the Danish National Board of Industrial Injuries.

Vaccines in the Danish childhood vaccination programme, side effects

Diphtheria-tetanus-pertussis-polio-Hib basic vaccination and diphtheria-tetanus-pertussis-polio revaccination

Local reactions presenting as redness and swelling at the injection site are commonly seen. Fever may occur a couple of hours after vaccination. This reaction may last about 48 hours and is harmless.

PCV, conjugated pneumococcal vaccine 

Given concurrently with the diphtheria-tetanus-pertussis-polio-Hib vaccine, adverse events are expected in the form of fever > 38°C in up to half of the vacinees and > 39.5°C in up to 3 % of the vacinees.
Consequently, fever cramps may occur.
After vaccination drowsiness, irritability, unsettled sleep, vomiting, diarrhoea and reduced appetite frequently occur.
Local reactions presenting as tenderness and swelling is expected in 35-40 % of the vacinees.

MMR vaccination

As these vaccines contain live, attenuated virus, the child may get symptoms slightly similar to the disease following vaccination.
Fever, common cold or skin rash may occur from about one week until three weeks after vaccination. The children are not infectious for the diseases.
More information may be obtained from the package leaflets.

HPV, Human Papilloma Virus vaccine

Mild fever and redness, swelling, itching or tenderness at the injection site are frequently occurring.

More information may be obtained from Q and A on HPV and the package leaflets.


Allergy towards the vaccine components or previous severe allergic reactions following vaccination.
Contraindications are further described in the package leaflets.

In case of acute illness with fever, vaccination should be postponed.
Common cold without fever is not a reason to postpone vaccinations.
Children who are ill or are being investigated for an illness should not be vaccinated until their condition is stationary.

More information

The side effects mentioned below should not be considered exhaustive.
For a more detailed description please refer to the package leaflets or to the Danish SSI webside De enkelte vacciner
From this side, you can find detailed product information about the individual vaccines.