Browse by topic
Are there historical examples of vaccines that were safe in...
Are there historical examples of vaccines that were safe in the short- or medium-term, but were found to have adverse long-term effects?
Thank you for this excellent question. This has been widely studied and the findings indicate that there are no adverse long-term effects observed. The vast majority of adverse events occur within 8 weeks of most immunizations.
On the other hand, there are many examples of adverse long-term effects caused from preventable diseases. For example, 25% of people who had a polio infection will go on to develop post poliomyelitis syndrome. There is a group in BC supporting people living with this syndrome - learn more about it here.