REGRET.IE recently obtained from the Irish Health Regulatory Authority (HPRA) all the adverse reaction report files for ten shots (26 individual vaccines) on the childhood schedule.
An analysis of the reports revealed that the number of Adverse Reaction Reports for the HPV Vaccine Gardasil (839 reports) are almost double those of the second most reported injection (the '4-in-1' shot with 428 reports) over a 5 year period.
According to the HPRA, "Spontaneous reporting of suspected ADRs (Adverse Drug Reactions) is an inexpensive and effective method for the lifetime surveillance of medicines" and "may contribute considerably to the assessment of a potential safety hazard".
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http://www.regret.ie/hpra_reports.html