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The sample size is very small and they list other limitations to their findings, but:

"In conclusion, despite concerns of waning immunity, appropriate immunoassays can detect antibodies against SARS-CoV-2 at 8 months after infection in most asymptomatic or mildly symptomatic persons."

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Thank you so much for a relevant article! At least it shows that in some/many asymptomatic cases there is an adaptive response. That makes me feel a bit better.

However, from my very first post "vaccine immunity is more robust than asymptomatic infections"... and detectable antibodies is a far cry (orders of magnitude) from neutralizing antibody levels, which are not uncommon even 8 months out in healthy vaccinated youth.

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