Long Covid: where we stand and challenges ahead.

Area of Science:

• Virology
• Immunology
• Neurology
• Cardiology
• Pulmonology
• Nephrology

Background:

• Post-acute sequelae of SARS-CoV-2 (PASC), commonly known as Long Covid, is characterized by persistent symptoms weeks to months after initial infection.
• PASC affects diverse organ systems, including the lungs, brain, cardiovascular, kidney, and neuromuscular systems.
• The pathogenesis of PASC is complex and multifactorial, involving viral persistence, immune responses, and inflammation.

Purpose of the Study:

• To define Post-acute sequelae of SARS-CoV-2 (PASC) and its clinical manifestations.
• To explore the multifactorial pathogenesis of PASC, including viral persistence, immune dysregulation, and autoimmunity.
• To discuss the potential impact of vaccination on PASC and the need for targeted therapeutic strategies.

Main Methods:

• Review of current scientific literature on PASC pathogenesis.
• Analysis of proposed mechanisms including viral seeding, immune responses, and autoimmunity.
• Evaluation of the role of vaccination in mitigating PASC.

Main Results:

• PASC presents with a wide array of symptoms affecting multiple organ systems.
• Key drivers of PASC include SARS-CoV-2 persistence, reactivation of other viruses (e.g., EBV), autoimmunity, and uncontrolled inflammation.
• Vaccination may reduce PASC risk after breakthrough infection, but its precise impact requires further definition.

Conclusions:

• PASC is a significant post-infectious complication with complex, multifactorial pathogenesis.
• Understanding these mechanisms is crucial for developing effective preventive and therapeutic interventions.
• PASC poses a substantial challenge to healthcare systems worldwide.