Retinal microvascular alterations consistent with endothelial dysregulation in paediatric post-COVID-19 syndrome: A prospective matched-cohort study 🚨More “hidden” post-COVID damage in children! Kids with long COVID show blood-vessel damage in their eyes, persistent, with partial & slow reversibility in some, still clearly abnormal months after one infection (retinal scans prove it)! ➡️German study design: - Prospective matched-cohort; 58 children (7–17 yrs) with paediatric post-COVID-19 syndrome (chronic phase) vs. 58 healthy controls (matched age/sex/BMI), - Retinal vessel analysis (static: CRAE/CRVE/AVR + dynamic flicker vasoreactivity) at baseline, and ~14-week follow-up, - Single-infection chronic PCS kids, ➡️Main findings: - Markedly wider central retinal arterioles (+28.1 μm, p<0.001) and venules (+21.7 μm, p<0.001) + higher AVR (+0.038, p=0.005), independent of BP or confounders, - Pattern = endothelial dysregulation, ➡️Longitudinal changes: - No overall group improvement at follow-up, - Kids with largest baseline venular dilation & reduced flicker response showed greatest recovery, - Longer follow-up + reduced symptoms → venular narrowing & AVR improvement, ➡️Implication: - First in-vivo evidence of persistent microvascular alterations in paediatric PCS, detectable non-invasively, ➡️Conclusion (paper): - “This study provides the first in-vivo evidence of altered retinal microvascular parameters in children and adolescents with PCS… persistent alterations in microvascular regulation several months after SARS-CoV-2 infection… heterogeneous, time-dependent changes… some patterns consistent with partial normalisation.” ‼️So paediatric post-COVID-19 syndrome causes long-lasting endothelial dysfunction in the microvasculature, visible months after infection, confirming a biological, vascular basis for kids’ persistent symptoms (not psychosomatic or transient). This isn’t “mild” anymore. It never was! This is measurable microvascular damage and remember: a second COVID infection DOUBLES their risk of Long COVID (Lancet Infect Dis 2026, RR 2.08). #AvoidSars2 #AvoidReinfections #ChildrenCovid19 thelancet.com/journals/lanin… nature.com/articles/s41598-0…

Tissue-specific autoantibody signatures reveal immune alterations undetected by routine serology in long COVID 🚨83% of long COVID patients have rogue autoantibodies attacking their own heart, lungs & blood vessels, and every standard blood test misses it completely. VERY INTERESTING! ➡️In a UNIQUE Hungarian cohort of 114 long COVID patients versus 36 pre-pandemic controls, tissue-specific Western blotting detected autoantibodies in 83% of cases, with strong cardiovascular dominance, ➡️Vascular autoreactivity was markedly higher in long COVID (34% vs. 8%, p<0.05), cardiac (54%) and pulmonary (34%) signals trended elevated but did not reach significance( cohort size?), ➡️Autoantibodies were predominantly IgM-skewed, polyreactive (up to 8 bands per patient), and persisted longitudinally (mean 141 days), with new isotypes emerging over time, ➡️Standard ANA testing showed no group differences and zero clinical correlations, rendering it useless for detecting these alterations, ➡️Cardiac autoreactivity associated with hypertension and headache, overall autoreactivity correlated with anosmia/ageusia, female sex, CRP, BMI, creatinine, and troponin levels, ➡️The study used human cardiac, pulmonary, and vascular tissue homogenates. ➡️Findings were independent of routine serology and highlight an under-recognized immune component invisible to current diagnostics. ➡️“This persistent, IgM-skewed profile suggests ongoing immune dysregulation and may reflect a previously underrecognized component of the immunological response in long COVID, highlighting the need for targeted immunodiagnostic approaches beyond routine serology.” ‼️Why this is shocking: It proves that in 83% of long COVID patients, the immune system is actively producing autoantibodies that directly target their own heart, lung, and especially blood-vessel tissues, yet every standard blood test (ANA HEp-2) comes back normal. These rogue antibodies are polyreactive, IgM-dominant, persist for months, and keep evolving. They correlate with real symptoms (anosmia, hypertension, headache) and lab markers of damage (troponin, CRP). ‼️In other words: The majority of long COVID sufferers have smouldering, organ-specific autoimmunity that is completely invisible to routine diagnostics. Doctors are flying blind while patients’ tissues are quietly under autoimmune attack. 🤔As far as I know, this is the first direct evidence of hidden, cardiovascular-dominant tissue autoimmunity driving the chronic L0ngC0vid phase! #BookMark #AvoidSars2 #AvoidReinfections link.springer.com/article/10…