These are outlined in the vaccine Patient Information Leaflet (PIL) The known side-effects are presented in the PIL by how commonly they occur.
About 1 girl in 10 will get pain, swelling and redness at the injection site and/ or headache.
About 1 girl in 100 will get nausea, pain in the vaccinated arm and mild fever.
About 1 girl in 1000 to 1 girl in 10,000 will get an itchy rash or hives.
If you are concerned that you may have developed a side effect after vaccination, seek medical advice.
Severe allergic reactions with difficulty breathing are very rare (about 1 in 1 million patients). However, the school vaccination team are trained to treat any severe allergic reaction.
Occasionally girls faint after getting an injection. The girls are advised to sit down for 15 minutes after the vaccination. This helps prevent fainting.
There are no known long-term side effects of Gardasil.
For more information, please see the PIL.