Long COVID: When can patients expect improvement?

Clinical takeaway: Counsel patients with long COVID persisting at 1 year that meaningful improvement remains possible over the next 2 years, while setting realistic expectations, particularly for those with multisystem symptoms.

Long COVID’s course remains difficult to predict once symptoms become chronic. These findings offer practical estimates for prognosis and underscore why treatment trials need concurrent control groups to distinguish treatment effects from improvement over time.

The prospective RECOVER-Adult study included 1,019 adults with likely long COVID 12 months after their first SARS-CoV-2 infection, assessed through symptom surveys every 3 months. Participants met a symptom-based Long COVID Research Index threshold of at least 11.

An estimated 36.2% fell below that threshold at 2 consecutive visits by 24 months after infection, rising to 50.1% by 36 months. This outcome indicated improvement, rather than complete recovery.

By 36 months, 56.4% had achieved at least a 50% reduction in their index score alongside good or better quality of life. Meanwhile, 26.9% reached a score of zero, meaning none of the symptoms contributing to the index were present.

Prognosis varied sharply by symptom pattern: The adjusted probability of improvement by 36 months was 18.6% for patients with multisystem symptoms versus 59.6% for those with predominantly smell or taste disturbances. Improvement was also more common among younger adults and those first infected during the Omicron era.

The observational findings cannot establish causation, and treatment use during follow-up was not evaluated. The authors say these findings could help shape future long COVID treatment trials by establishing how often symptoms improve without targeted therapy, providing a benchmark against which new interventions can be measured.

“These findings underscore both the potential for natural recovery and the urgent need for placebo-controlled therapeutic intervention trials,” the authors wrote.

Source: Reeder HT, et al. (2026 Nov 3) Ann Intern Med. Timing of Long COVID Improvement in Prospectively Followed RECOVER-Adult Participants