How long does the immunity to COVID-19 last after getting the vaccine?


How long does protection from COVID-19 vaccine last?

We don’t know yet how long COVID-19 vaccine protection lasts. The COVID-19 vaccines are very effective and provide good, ongoing protection against severe disease – which is the primary goal of the vaccination program. Here in BC, the longer interval between vaccine doses has been very helpful in supporting long lasting vaccine effectiveness. 
However, because vaccines are not 100% effective against symptomatic infection, breakthrough infections among fully vaccinated people will happen. The vast majority of these are expected to be mild. Hospitalizations for COVID-19 among fully vaccinated individuals are rare. 
There is some evidence that the level of protection against symptomatic infection decreases over time after the initial vaccination series, especially for people who got their two COVID-19 vaccines less than 5 weeks apart, those with immunocompromising conditions, and among older individuals. This reduction in protection has led to the recommendation that everyone ages 18 years and older get a booster shot after completing their primary vaccination series.
Vaccine effectiveness continues to be monitored by BCCDC.  Read more about BC vaccine effectiveness on the BCCDC website.
Date last reviewed: 
Sunday, Mar 27, 2022