Post Acute Covid-19 Vaccination Syndrome

Some people report persistent health problems after receiving the COVID-19 vaccine. These symptoms persist well beyond typical short-term vaccine side effects and are not attributable to any other known medical conditions. This condition is known as Post-Acute COVID-19 Vaccination Syndrome (PACVS). Symptoms can persist for months and affect several organ systems, causing issues such as fatigue, heart-related problems, neurological difficulties, and decreases in both physical ability and mental performance. PACVS shows similarities to Post-Acute COVID-19 syndrome (PACS) and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). The biological processes that cause PACVS are still not fully understood. Recent research indicates that endothelial dysfunction, abnormalities in blood coagulation, and persistent inflammatory responses may contribute significantly to this process. However, it remains unclear how symptoms develop over time, which biological markers are associated with disease severity, and how these findings could support diagnosis and future treatment strategies. The CLEAR study is an observational research project designed to address these knowledge gaps by systematically documenting symptoms over time and investigating potential biological correlates in individuals affected by PACVS. The study consists of three complementary subprojects. The PROGRESS subproject aims to assess symptom burden, disease course, and patient-reported treatment experiences over an eight-month period using standardized questionnaires completed by participants. The ENDOCLOT subproject investigates whether individuals with PACVS show objective signs of endothelial dysfunction, abnormalities in blood clotting, and markers of systemic inflammation. Endothelial function will be evaluated through non-invasive vascular reactivity tests (EndoPAT), microscopic examination of blood cells, standardized platelet function assessments, and standard laboratory diagnostics. It further explores the correlation between these biological parameters and clinical symptom trajectories identified in PROGRESS. The REAL subproject examines the role of endothelial activation and the release of inflammatory signaling molecules (cytokines) in the development and persistence of PACVS. The main hypothesis of the CLEAR study is that PACVS is associated with measurable endothelial dysfunction, inflammatory activation, and coagulation abnormalities, and that these biological changes are related to symptom severity and persistence over time. By combining longitudinal symptom assessment with biological measurements, this study aims to improve understanding of PACVS and support the development of better diagnostic and therapeutic approaches in the future.

The goal of this clinical trial is to evaluate whether metabolic modulation with a combined nutraceutical product can improve symptoms and metabolic health in adults diagnosed with post-acute Covid-19 vaccination syndrome (PACVS), a condition characterized by persistent fatigue and exercise intolerance attributed to Covid-19 vaccination and confirmed by laboratory testing. The main questions it aims to answer are: Does the combined nutraceutical intervention improve quality of life (measured by the PAC-19QoL questionnaire) in PACVS patients? Does the intervention improve metabolic, inflammatory, and functional biomarkers (e.g., HbA1c, blood lactate, CRP, spike protein levels, heart rate variability, 6-minute walk distance)? Researchers will compare the intervention group (receiving the ViTAL SCAN nutraceutical) to a placebo group (receiving rice protein powder with vitamin C) to determine if the intervention leads to greater improvements in symptoms and biomarker profiles. Participants will: Take the assigned supplement daily for 3 months (ViTAL SCAN or placebo) Attend clinic visits for blood and urine sampling, physical performance tests (6-minute walk test), and heart rate monitoring Complete quality of life and health behavior questionnaires Undergo measurements of metabolic and inflammatory markers (HbA1c, lactate, CRP, spike protein) Record supplement intake This study is currently pending IRB approval and aims to enroll 100 adults with PACVS for a randomized, placebo-controlled trial.