Multiple Neuroinvasive Pathways in COVID-19

Area of Science:

• Neurology
• Infectious Diseases
• Neuroscience

Background:

• COVID-19, caused by SARS-CoV-2, is recognized as a multi-organ disease beyond respiratory symptoms.
• The brain is a target, affected through direct viral invasion or indirect mechanisms.
• Neurological manifestations are diverse, ranging from anosmia to severe encephalopathy.

Purpose of the Study:

• To review the direct and indirect mechanisms of SARS-CoV-2 neuroinvasion.
• To summarize the spectrum of neurological symptoms associated with COVID-19.
• To highlight concerns regarding long-term cognitive sequelae and potential neurodegenerative risks.

Main Methods:

• Literature review of studies on COVID-19 and neurological manifestations.
• Analysis of proposed mechanisms of viral entry into the central nervous system.
• Synthesis of reported clinical symptoms and potential long-term outcomes.

Main Results:

• SARS-CoV-2 can infect the brain via olfactory nerves or the bloodstream, crossing the blood-brain barrier.
• Neurological symptoms include anosmia, headaches, seizures, confusion, and coma.
• Hypoxia, immune responses, and clotting disorders contribute to brain damage.

Conclusions:

• COVID-19 poses significant risks to neurological health, with potential for persistent cognitive deficits.
• Long-term follow-up is crucial to understand the full scope of neurocognitive sequelae.
• Establishing patient registries and follow-up protocols is urgently needed.