Linked from
The 34 pages that link to Vaccine, each with the reason it gives.
FeverRelated: Immune activation after vaccination can cause a short-lived fever.
AntigenRelated: Vaccines expose immune systems to selected antigens to build protective memory.
Cell cultureRelated: Cell cultures can grow viruses or produce vaccine components for manufacturing.
OcrelizumabRelated: Ocrelizumab can weaken vaccine responses, so vaccination timing matters.
Medical scienceRelated: Vaccine research tests ways to prevent infectious disease before exposure.