Proposed SAND framework links SARS-CoV-2, Long Covid and the aging brain
The abstract proposes calling SARS-CoV-2-associated neurological disorder "SAND" by analogy with HIV-associated neurological disorder (HAND), and suggests SARS-CoV-2 infection and aging may aggravate each other, raising risk of disorders like Alzheimer's and Parkinson's. [1]
Automatic summary · not editorially reviewed
The key findings
The abstract proposes the acronym SAND for SARS-CoV-2 Associated Neurological Disorder by analogy with HIV-associated neurological disorder (HAND). [1]
The abstract states there is little evidence that SARS-CoV-2 enters the brain, unlike HIV, which crosses the blood-brain barrier in T-lymphocytes and monocytes. [1]
The abstract proposes that SARS-CoV-2 infection/SAND is on a collision course with aging, with mutual aggravation and increased risk of disorders like Alzheimer's and Parkinson's. [1]
The source at a glance
- Study type / format
- Abstract of a conceptual and mechanistic review or perspective
- Population / context
- People affected by SARS-CoV-2 infection, COVID-19 and Long Covid, discussed alongside HIV infection and aging.
- Summary based on
- Study abstract
- Original publication
- August 29, 2026
Proposed SAND label and Long Covid symptoms
The abstract notes that SARS-CoV-2 spread globally in 2020 and infected over 750 million people; COVID-19 caused at least 7 million deaths, and around a hundred million people developed Long Covid. Long Covid is described as a multi-organ syndrome, often called "Brain Fog", with extreme fatigue, anxiety, poor sleep and, most prominently, cognitive impairment. It emerges three or more months after infection. By analogy to HAND, the authors propose the acronym SAND for SARS-CoV-2 Associated Neurological Disorder.
Supporting source [1]
Little brain entry evidence; indirect and protein effects
The abstract contrasts HIV, where the virus crosses the blood-brain barrier in T-lymphocytes and monocytes to infect microglia and other cell types, with SARS-CoV-2, for which there is little evidence that it enters the brain. It nonetheless describes indirect effects of somatic hyper-inflammation ("cytokine storm") and disruption of blood- and CSF-brain barriers. It further states that SARS-CoV-2-encoded S1 Spike protein and other virally encoded proteins enter the brain to directly interfere with cerebral function. Microglia and astrocytes adopt a pro-inflammatory phenotype, neurotoxic proteins accumulate, mitochondrial energy generation declines and synaptic transmission is perturbed.
Supporting source [1]
Aging collision course and proposed research programme
The abstract proposes that, mimicking HIV infection/HAND, SARS-CoV-2 infection/SAND is on a collision course with aging, leading to mutual aggravation and an increased risk of disorders like Alzheimer's and Parkinson's disease. It says these findings for SAND mirror observations seen with aging and dementia. It calls for a broad-based programme of research and development, healthcare and social support to better understand the interacting mechanisms, prevent onset, alleviate symptoms and improve readiness for future brain-damaging viruses. These are proposals and associations, not demonstrated causes or human lifespan benefits.
Supporting source [1]
How to interpret this
This is an abstract only; the full text was not reviewed. It presents a proposed framework and mechanistic hypotheses, not a validated product or demonstrated causal or lifespan effects in humans.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Millan MJ. · europepmc.org · August 29, 2026