NIH RECOVER 2026 Publications: Long Covid Research Updates

RECOVER Research Output | February 2026

In early 2026, the NIH RECOVER Initiative published multiple studies aimed at better understanding Long COVID and related post-infectious conditions in both adults and children.

One study in Nature Immunology found evidence that people with Long COVID show ongoing activation of inflammatory pathways along with signs of “immune exhaustion,” a state in which immune cells may become less responsive after prolonged activation (1). This supports the idea that Long COVID may involve persistent immune system imbalance rather than a single lingering infection.

A related preprint reported differences in antibody responses to SARS-CoV-2 structural proteins, including envelope and nucleocapsid proteins, suggesting that immune signaling patterns remain altered in some individuals months after infection (2).

Several 2026 publications focused on children. An EHR-based study in the Journal of Infection examined whether body mass index before COVID-19 influenced later cardiovascular, gastrointestinal, or neuropsychiatric outcomes in young people (3). Another RECOVER study in The Journal of Pediatrics found associations between prior COVID-19 and later dyslipidemia (abnormal cholesterol levels) and changes in body mass index in children and adolescents (4). A separate pregnancy cohort study evaluated infant neurodevelopment through 18 months following in utero SARS-CoV-2 exposure (5).

Researchers also examined broader structural influences. A JAMA Pediatrics study analyzed how social determinants of health, such as socioeconomic factors and access to care, intersect with pediatric Long COVID risk (6).

In addition to Long COVID, RECOVER investigators published new data on multisystem inflammatory syndrome in children (MIS-C). A replication study found that children with MIS-C showed high levels of inflammation-related proteins and an intensified immune response involving interferon-γ, a key immune messenger. These results support earlier evidence that MIS-C involves an overactive immune response (7).

Finally, a paper in the American Heart Journal described the design of RECOVER-AUTONOMIC, a randomized platform trial evaluating potential treatments for Long COVID–associated postural orthostatic tachycardia syndrome (POTS), a form of autonomic dysfunction characterized by rapid heart rate upon standing (8).

Together, these 2026 publications reflect a shift from simply describing Long COVID symptoms to identifying biological mechanisms, long-term pediatric patterns, and structured pathways for clinical trials.

Citations

1. Aid, M., Boero-Teyssier, V., McMahan, K., Dang, R., Doyle, M., Belabbaci, N., Borducchi, E., Collier, A. Y., Mullington, J., & Barouch, D. H. (2026). Long COVID involves activation of proinflammatory and immune exhaustion pathways. Nature immunology, 27(1), 61–71. https://doi.org/10.1038/s41590-025-02353-x
2. Kwissa, M., Mathayan, M., Salunkhe, S. S., Bakthavachalam, V., Ye, Z., Sanborn, M. A., Condo, S., Upadhye, A., Nemakal, A., Richner, J. M., Basu, S., Novak, R. M., Jacobson, J. R., Ganesh, B. B., Cerda, M., Utz, P. J., Krishnan, J. A., Prabhakar, B. S., & Rehman, J. (2025). Persistent Immune Dysregulation during Post-Acute Sequelae of COVID-19 is Manifested in Antibodies Targeting Envelope and Nucleocapsid Proteins. bioRxiv : the preprint server for biology, 2025.08.18.670908. https://doi.org/10.1101/2025.08.18.670908
3. Zhou, T., Zhang, B., Zhang, D., Jhaveri, R., Chen, J., Becich, M. J., Castro, L., Chen, Y., Chilukuri, N., Herring, S. J., Lei, Y., Li, L., Lu, Y., Hornig, M., Khalsa, A. S., Liebovitz, D., Mosa, A. S. M., Taylor, B. W., Tedla, Y. G., Thodeson, D., … Chen, Y. (2026). Pre-COVID-19 body mass index and post-acute cardiovascular, gastrointestinal, and neuropsychiatric outcomes among children and young adults with SARS-CoV-2 infection: An EHR-based cohort study from the RECOVER Initiative. The Journal of infection, 92(3), 106702. Advance online publication. https://doi.org/10.1016/j.jinf.2026.106702
4. Lei, Y., Zhou, T., Zhang, B., Zhang, D., Tang, H., Chen, J., Wu, Q., Li, L., Bailey, L. C., Becich, M. J., Blecker, S., Christakis, D. A., Fort, D., Herring, S. J., Hwang, W., Khalsa, A. S., Kim, S., Liebovitz, D. M., Mosa, A. S. M., Rao, S., … RECOVER Consortium (2026). Post-Acute Dyslipidemia and Abnormal Body Mass Index in Children and Adolescents with COVID-19: A Cohort Study from the RECOVER Initiative. The Journal of pediatrics, 291, 114996. Advance online publication. https://doi.org/10.1016/j.jpeds.2026.114996
5. Flaherman, V. J., Reeder, H. T., Martin-Herz, S. P., Gallagher, R., Cohen, A. K., Brown, H. E., Clifton, R. G., Fischbein, N., Foulkes, A. S., Jacoby, V. L., Jain, N., Beamon, C. J., Bahtiyar, M. O., Chang, A., Costantine, M. M., Cruz Irving, A., Gibson, K. S., Hoffman, M. C., Hoffman, M. K., Hughes, B. L., … RECOVER-Pregnancy Consortium (2026). Intrauterine SARS-CoV-2 Exposure and Infant Neurodevelopment through 18 Months of Age: Findings from the Researching COVID to Enhance Recovery (RECOVER) Pregnancy Study. The Journal of pediatrics, 292, 114997. Advance online publication. https://doi.org/10.1016/j.jpeds.2026.114997
6. Rhee, K. E., Thaweethai, T., Pant, D. B., Stein, C. R., Salisbury, A. L., Kinser, P. A., Kleinman, L. C., Gallagher, R., Warburton, D., Mohandas, S., Snowden, J. N., Stockwell, M. S., Tantisira, K. G., Flaherman, V. J., Teufel, R. J., Castro, L., Chung, A., Espinoza Esparza, J., Hockett, C. W., Isidoro-Chino, M., … Yurgelun-Todd, D. A. (2026). Social Determinants of Health and Pediatric Long COVID in the US. JAMA pediatrics, e255485. Advance online publication. https://doi.org/10.1001/jamapediatrics.2025.5485
7. McCuaig, S., Toland, C., Konvinse, K. C., Yang, E., Utz, P. J., Vella, L. A., Odom John, A. R., Bassiri, H., & Behrens, E. M. (2026). Macrophage Activation Syndrome-Associated Proteins and Enhanced Interferon-γ Responsiveness in the Plasma Proteome of Patients With Multisystem Inflammatory Syndrome in Children in a Pretreatment Replication Single-Center Cohort. ACR open rheumatology, 8(2), e70181. https://doi.org/10.1002/acr2.70181
8. Fudim, M., Novak, P., Taub, P. R., Chung, T., Zimmerman, K. O., Moy, O. V., Fissler, H. Z., Wen, J., Freeman, N. L. B., O’Brien, S., Marti, H., Cook, D., Low, P., Kim, D. Y., Rosenberg, Y., Granger, C. B., & Shibao, C. A. (2026). Design and rationale of RECOVER-AUTONOMIC: a randomized platform trial evaluating interventions for Long COVID postural orthostatic tachycardia syndrome. American heart journal, 107384. Advance online publication. https://doi.org/10.1016/j.ahj.2026.107384