Judging by this week's survey of four recent COVID booster recipients, you have a 50% chance of feeling nothing at all other than soreness at the injection site. Two felt no ill effects at all, one ran a fever for 24 hours, and one spent a day watching movies and napping.
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@ImagineThat I did flu in right and covid in left on a Friday evening, was run down and had a low-grade fever the next day, slept a lot. Was fine by Sunday evening.