"We don't know the long-term side effects of Covid vaccines." That's a claim that's still common to see shared online.
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But a year is actually considered "long term" when it comes to vaccine safety.
This week marks the anniversary of the first delivery of Covid-19 vaccines under the Covax scheme - as well as being more than 14 months since the first dose was given.
And scientists explain that's more than enough time for all but the rarest side effects to have emerged.
What's happening in your body?
Even though Covid vaccines are relatively new, the processes they trigger in your body are not.
Understanding how they stimulate the immune system can help us understand how quickly we can expect to have any negative reactions.
After 15 minutes
A tiny fraction of people will have an allergic reaction to the inactive ingredients in the vaccine and this will happen within about 15 minutes of receiving it.
After a few hours
Shortly after receiving the vaccine, the immune system kicks into action.
Your body recognises an alien invader and attacks it with immune cells, the weapons it would use against any virus or bacteria.