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Posted - July 15, 2024 at 9:49 AM
Saved - July 16, 2024 at 5:03 AM
reSee.it AI Summary
Survivors of SARS-CoV-2 face severe and lasting damage to their immune systems. Ten months post-infection, patients show reduced levels of crucial immune cells, including T, B, and NK cells. The decline in recent thymic emigrant T cells and memory B cells is particularly troubling, as they are vital for long-term immunity. This immunodeficiency is compounded by a shift to a Th2 cytokine profile, rendering survivors more vulnerable to infections and other health issues. The observed weakened ability to combat new infections and propensity towards inappropriate immune responses is concerning. Even younger patients experience significant immune deterioration, with a decline in antibodies and immune cells. Long-term alterations in T-cell subsets are particularly alarming, indicating ongoing immune reprogramming. These changes are independent of antibody decline patterns, suggesting deep and long-lasting immune dysregulation caused by SARS-CoV-2. The impact on the immune system is profound and multifaceted, with lasting reductions in both innate and adaptive immune cells and a shift towards a less effective Th2 cytokine profile.

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A grim reality for SARS-CoV-2 survivors Severe and lasting damage to their immune systems 🧵 1/ https://onlinelibrary.wiley.com/doi/10.1111/all.16210

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Ten months post-infection, patients exhibit drastically reduced levels of crucial immune cells, including T, B, and NK cells. 2/

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Particularly troubling is the significant decline in recent thymic emigrant T cells and memory B cells. Vital cells for long-term immunity. 3/

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This immunodeficiency is compounded by a detrimental shift to a Th2 cytokine profile. SARS-CoV-2 is rendering survivors more vulnerable to infections and other health issues. 4/

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The observed shift from a Th1 to a Th2-dominated cytokine profile is concerning. Th1 responses are typically associated with fighting viral infections and activating cellular immunity, whereas Th2 responses are more aligned with allergic reactions and parasitic infections. 5/

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This shift indicates a weakened ability to combat new infections and a propensity towards inappropriate immune responses. 6/

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Younger patients exhibit a stark decline in NC- and S-specific antibodies, coupled with reduced numbers of NK cells and memory B cells. The younger demographic, often thought to be less affected by SARS-CoV-2, is experiencing significant immune deterioration. 7/

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The long-term alterations in T-cell subsets are particularly alarming. While there is some normalization in effector and regulatory T cell numbers, the persistent decline in recent thymic emigrants and the increase in central memory T cells mean ongoing immune reprogramming 8/

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These changes are independent of antibody decline patterns. The immune dysregulation is deeply ingrained and long-lasting. 9/

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SARS-CoV-2 impact on the immune system is profound and multifaceted. It comes with lasting reductions in both innate and adaptive immune cells and a shift towards a less effective Th2 cytokine profile. 10/10

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