After getting long COVID, I took my next booster in November 2023 and by then they had come out with the Novavax vaccine, which is non-MRNA and seems to elicit a milder reaction from your immune system. I understand that it uses the same technology as they use for the flu shots (i.e., not having your body's cells produce proteins, etc.) so there is less chance of your body producing another protein in error and having your immune system react to it. I know I'm not explaining it in the most precise terms, but there was a recent article about the Pfizer vaccine (MRNA) stating that it had caused some of these erroneous proteins (I think proteins, but at any rate, pieces of proteins) to be synthesized by some people, but they said that it was harmless but that they would be working in the future to improve the vaccine to eliminate that from happening. I myself had taken all of the Moderna MRNA boosters before now, but since I have long COVID and wanted to be cautious, I took the Novavax vaccine this time and recommend the Novavax version for anyone who wants a milder COVID vaccine. I didn't feel any reaction from it at all, vs. the day of fever that I felt with each of the Moderna MRNA boosters.