Effect of Oral Nirmatrelvir on Long COVID Symptoms: 4 Cases and Rationale for Systematic Studies

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Michael J. Peluso, M.D.
Khamal Anglin, M.D.
Matthew S. Durstenfeld, M.D.
Jeffrey N. Martin, M.D.
J. Daniel Kelly, M.D., Ph.D.
Priscilla Y. Hsue, M.D.
Timothy J. Henrich, M.D.
Steven G. Deeks, M.D.

Abstract

Background: Efforts to understand the impact of SARS-CoV-2 variants, vaccine status, and treatment on the development and persistence of Long COVID have intensified. 


Methods: We report 4 sequential cases from a post-COVID cohort study demonstrating variability in outcomes following differentially timed nirmatrelvir therapy, received as part of clinical care. 


Results: In the first case, the participant experienced symptomatic rebound and developed Long COVID despite early initiation of antiviral therapy. In the next 2 cases, participants reported improvement in persistent COVID symptoms when nirmatrelvir was taken 25 and 60 days following initial symptom onset. In the final case, an individual with presumed Long COVID for 2 years reported substantial improvement in chronic symptoms when taking nirmatrelvir following SARS-CoV-2 re-infection. 


Conclusions: These anecdotes suggest that systematic study of antiviral therapy for Long COVID is warranted.

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