A new broadly inclusive definition of long COVID from the National Academies of Sciences, Engineering, and Medicine (NASEM) has been developed with the aim of improving consistency, documentation, and treatment for both adults and children.
According to the 2024 NASEM definition of long COVID issued on June 11, 2024, “Long COVID is an infection-associated chronic condition that occurs after SARS-CoV-2 infection and is present for at least 3 months as a continuous, relapsing and remitting, or progressive disease state that affects one or more organ systems.”
People with long COVID may present with one or more of a long list of symptoms, such as shortness of breath, rapid heartbeat, extreme fatigue, post-exertional malaise, or sleep disturbance and with single or multiple diagnosable conditions, including interstitial lung disease, arrhythmias, postural orthostatic tachycardia syndrome (POTS), myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), diabetes, or autoimmune disorders. The condition can exacerbate preexisting health conditions or present as new ones.
The definition does not require laboratory confirmation or other proof of initial infection. Long COVID can follow SARS-CoV-2 infection of any severity, including asymptomatic infections, whether or not they were initially recognized.
Several working definitions and terms for long COVID had previously been proposed, including those from the World Health Organization (WHO) and the US Centers for Disease Control and Prevention, but no common definition or terminology had been established.
The new definition was developed at the request of the Administration for Strategic Preparedness and Response and the Office of the Assistant Secretary for Health (OASH). It was written by a multistakeholder panel convened by NASEM, which recommended that the new definition be universally adopted by the federal government, clinical societies and associations, public health practitioners, clinicians, payers, the drug industry, and others using the term long COVID.
Recent surveys suggest that approximately 7% of Americans have experienced or are experiencing long COVID. “It’s millions of people,” panel chair Harvey V. Fineberg, MD, president of the Gordon and Betty Moore Foundation, told Medscape Medical News.
The new definition “does not erase the problem of clinical judgment…But we think this definition has the real advantage of elevating to the clinician’s mind the real likelihood in the current environment of prevalence of this virus that a presenting patient’s strange symptoms are both real and maybe related as an expression of long COVID,” Fineberg noted.
One way this new definition differs from previous ones such as WHO’s, he said, is “they talk about a diagnosis of exclusion. One of the important points in our definition is that other diagnosable conditions like ME/CFS or POTS can be part of the picture of long COVID. They are not alternative. They are, in fact, an expression of long COVID.”
Indeed, the NASEM report also introduces the term infection-association chronic condition (IACC). This was important, Fineberg said, “because it’s the larger family of conditions of which long COVID is a part. It emphasizes a relatedness of long COVID to other conditions that can follow from a variety of infections. We also adopted the term ‘disease state’ to convey the seriousness and reality of this condition in the lives of patients.”
Comments on New Definition
In a statement provided to Medscape Medical News, Lucinda Bateman, MD, and Brayden Yellman, MD, co-medical directors of the Bateman-Horne Center in Salt Lake City, said that “describing long COVID as an IACC…not only meets the NASEM goal of allowing clinicians, researchers, and public health officials to meaningfully identify and serve all persons who suffer illness or disability in the wake of a SARS-CoV-2 infection, but also draws direct comparison to other known IACC’s (such as ME/CFS, post-treatment Lyme, POTS) that have been plaguing many for decades.”
Fineberg noted another important aspect of the NASEM report: “Our definition includes an explicit statement on equity, explaining that long COVID can affect anyone, young and old, different races, different ages, different sexes, different genders, different orientations, different socioeconomic conditions…This does not mean that every single person is at equal risk. There are risk factors, but the important point is the universal nature of this as a condition.”
Two clinical directors of long COVID programs who were contacted by Medscape Medical News praised the new definition. Zijian Chen, MD, director of Mount Sinai’s Center for Post-COVID Care, New York, said that it’s “very similar to the definition that we have used for our clinical practice since 2020. It is very important that the broad definition helps to be inclusive of all patients that may be affected. The inclusion of children as a consideration is important as well, since there is routinely less focus on children because they tend to have less disease frequency…The creation of a unified definition helps both with clinical practice and research.”
Nisha Viswanathan, MD, director of the long COVID program at the University of California, Los Angeles, said: “I think they left it intentionally broad for the medical practitioner to not necessarily use the definition to rule out individuals, but to perhaps use more of a clinical gestalt to help rule in this diagnosis…I think this definition is providing clarity to healthcare providers on what exactly would be falling under the long-COVID diagnosis header.”
Viswanathan also said that she anticipates this definition to help patients make their case in filing disability claims. “Because long COVID has not previously had a good fleshed-out definition, it was very easy for disability providers to reject claims for patients who continue to have symptoms …I actually think this might help our patients ultimately in their attempt to be able to have the ability to care for themselves when they’re disabled enough to not be able to work.”
Written into the report is the expectation that the definition “will evolve as new evidence emerges and the understanding of long COVID matures.” The writing committee calls for reexamination in “no more than 3 years.” Factors that would prompt a reevaluation could include improved testing methods, discovery of medical factors and/or biomarkers that distinguish long COVID from other conditions, and new treatments.
Meanwhile, Fineberg told Medscape Medical News, “If this definition adds to the readiness, awareness, openness, and response to the patient with long COVID, it will have done its job.”
Fineberg, Bateman, Yellman, Viswanathan, and Chen have no relevant disclosures.
Miriam E. Tucker is a freelance journalist based in the Washington, DC area. She is a regular contributor to Medscape, with other work appearing in The Washington Post, NPR’s Shots blog, and Diatribe. She is on X (formerly Twitter) @MiriamETucker.
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