Now, the effects of waning immunity may be beginning to show in Israelis vaccinated in early winter; a preprint published last month by physician Tal Patalon and colleagues at KSM, the research arm of MHS, found that protection from COVID-19 infection during June and July dropped in proportion to the length of time since an individual was vaccinated. People vaccinated in January had a 2.26 times greater risk for a breakthrough infection than those vaccinated in April. (Potential confounders include the fact that the very oldest Israelis, with the weakest immune systems, were vaccinated first.)
end partial quote from:
https://www.sciencemag.org/news/2021/08/grim-warning-israel-vaccination-blunts-does-not-defeat-delta
The point being that even if you are vaccinated you might want to think about getting a booster within 5 to 6 months of your last vaccination as a precaution.
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