Reviews on Long COVID: A scope of the literature:Update January 2024

• For this update, we identified 42 published reviews and 42 review protocols for Long COVID. The number of published reviews Is less than in October (n=46) but more than in July (n=31) and April (n=37), 2023. • Most published reviews were focused on the prevalence of symptoms or effects (18/42), which remains consistent with the earlier reports. • This update includes more published reviews with a primary focus on Long COVID risk factors (n=9) than in each of the previous reports. We identified fewer on treatment or rehabilitation (n=7) than in the October 2023 report (n=11), but more than in the four previous reports (n=5). • We identified fewer reviews on pathobiology or mechanisms (n=2), than for the October 2023 report (n=6), but a similar number to previous reports (e.g., July 2023, n=1). • Similar numbers of protocols were focused on the prevalence of symptoms or effects (15/42), and treatment or rehabilitation (13/42). These have consistently been the largest two categories across all the previous reports. • Seven protocols were focused on risk factors with or without prevalence; the same number as in the October 2023 report.