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I had my last booster in early September of last year. I have seen many studies showing that most people's spike protein antibodies dropped to about 6,000 BAU/Ml in six months then steadily declined. I am incredibly anxious about covid and am desperately trying to get my life back to some degree of normalcy. My whole family had a very bad virus in March and three of us were diagnosed with pneumonia. I lost my sense of smell for nearly a week. Drs weren't testing for covid at the time. No pcr was done. One NAAT was negative and a handful of at home tests were negative. I did have one faint positive on a test that my child moved. If we had COVID and survived I'd feel so much better. So this week I took a spike protein test that came back 4886 BAU/ml at Labcorp. Roche elesys test. It sounds like I must have had a boost because it's higher than other numbers I've seen from people who DID have the second bivalent booster. I did not. But my anti-nucleocapsid test was negative. I can't find s source on how long those last. I've seen sources saying they could be gone six months out like this. I just need some sort of reassurance. From what I read it's impossible to have spike protein antibodies at nearly 5k over a year out. But I can't find proper sources. Anything would help. Thank you.
The symptoms you described from March are consistent with a Covid infection. The elevated antibody against spike protein after 1 year from your last booster dose also seems to indicate that you were exposed to Covid more recently. The antibody against nucleocapsid is known to decline more rapidly (within 1-3 months) than the antibody against spike protein (which declines after about 6 months), so having the negative anti-nucleocapsid antibody is still consistent with a Covid infection in March.
