Researchers at Karolinska Institutet in Sweden and their Danish colleagues have monitored HPV-vaccinated girls via patient data registries in order to examine the incidence of a wide range of diseases and thus determine if there are any serious adverse effects of the vaccine. Their results show no significant increase of the examined diseases in the vaccinated girls relative to their unvaccinated peers.
The study included almost a million Swedish and Danish girls born between 1988 and 2000, and compared roughly 300,000 girls who had been HPV vaccinated with 700,000 who had not. All the girls were between 10 and 17 at time of vaccination, and the vaccines had been administered at some time between 2006 and 2010. The researchers then used patient registries in Denmark and Sweden to study the incidence of any serious adverse effects of the vaccine.
The researchers examined 53 different diagnoses requiring hospital or specialist care, including blood clots, neurological diseases, and autoimmune diseases such as type 1 diabetes. They found that none of these diseases were more common in the vaccinated group than in the unvaccinated group.