Researchers analyzed blood samples from 26,823 adult participants who reported recovering from COVID-19. Of all participants, 1,091 tested positive for antibodies, including 453 participants who later reported having had COVID-19 with 914 participants reporting they had COVID-19 prior to serology tests.
“Although our study did not assess long COVID per se because we also included participants without COVID-19 infection, these specific analyses may be more representative of the long COVID clinical issue in real-life settings than the picture provided by cohorts of patients with a laboratory-confirmed or physician-documented COVID-19 infection,” researchers wrote.
Noted limitations to the study included selection biases that limit the representativeness of sample, lack of investigation into all reported symptoms of post COVID-19 and separate analysis of persistent symptoms.
Researchers said the findings emphasize the importance of considering all possible causes of persistent symptoms in addition to the virus itself.
Key findings:
- Most common persistent symptoms were sleep problems, joint pain and back pain.
- Only loss of smell was positively linked to previous COVID-19 infection.
- Self-reported infection was positively associated with lingering symptoms except for impaired hearing and sleep problems.
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