evidence: The Covid-19 vaccines have been tested to the same high standards as any vaccine would be. While side effects are common, these are overwhelmingly minor and pass within a few days. [...] All the vaccines are intended to protect people against Covid-19. It is unclear how long that protection will last, and so in that sense the effects of the vaccines may wear off over time. [...] The Yellow Card website says: "For all COVID-19 vaccines, the overwhelming majority of reports relate to injection-site reactions (sore arm for example) and generalised symptoms such as ‘flu-like’ illness, headache, chills, fatigue (tiredness), nausea (feeling sick), fever, dizziness, weakness, aching muscles, and rapid heartbeat. Generally, these happen shortly after the vaccination and are not associated with more serious or lasting illness."