| − | A '''seizure''' is the sudden onset of a jerking and staring spell usually caused by [[fever]]. This is also known as a convulsion.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#s</ref> | + | A '''seizure''' is the sudden onset of a jerking and staring spell usually caused by [[fever]]. This is also known as a convulsion.<ref>https://www.cdc.gov/vaccines/about/terms/glossary.htm#s</ref> |