Sebastian Rushworth
Dec 9, 2020
https://sebastianrushworth.com/2020/12/09/how-long-does-immunity-to-covid-last/
more important to look at what’s happening with memory B-cells than with antibodies, if you want to know how long your body maintains the ability to mount an antibody response to an infection.
[…]
it is clear from this study that there is significant immune memory at the six to eight month time point after infection. At six to eight months after infection, 90% of measured samples still had antibodies and T-helper cells specific for covid-19, and 50% still had measurable T-killer cells. If the decline continues linearly over time from what was seen in this study, then it is reasonable to assume that most people continue to be immune to covid after infection for at least a couple of years.