Ebola Virus Disease and Its Persistence in the Central Nervous System

Understanding the Relapse Potential

Ebola virus disease has shown a concerning capability to remain in the central nervous system (CNS) even after being eradicated from other parts of the body, leading to potential relapses. This phenomenon has prompted researchers to investigate whether patients who have recovered but exhibit neurological symptoms still harbor viral loads in their CNS.

Long-Term Effects of the Ebola Epidemic

In the aftermath of the recent Ebola virus disease epidemic in West Africa, it has become evident that many survivors experience long-term complications. One notable issue is the virus’s ability to persist in the CNS, which can ultimately result in a relapse of the disease.

Research Conducted by Billioux and Colleagues

A study published in JAMA Neurology by researchers Billioux and colleagues focused on the cerebrospinal fluid (CSF) of Ebola virus disease survivors. The CSF, which encases the brain and spinal cord, can serve as a reservoir for various viruses and bacteria. To examine the presence and concentration of these pathogens, medical professionals perform a procedure known as a lumbar puncture, involving the extraction of CSF from the lower back.

Study Methodology and Findings

The research involved 165 patients who had recovered from Ebola virus disease, assessing them for neurological symptoms. Out of these, the CSF of seven patients—who exhibited stable symptoms and no other conditions like HIV—was analyzed. These patients had been discharged from Ebola treatment facilities between 364 and 459 days prior to their lumbar punctures. The researchers employed a real-time technique known as reverse transcriptase–polymerase chain reaction (RT-PCR) to detect, amplify, and replicate Ebola virus genes.

Significant Outcomes and Recommendations

This important study represents the first comprehensive evaluation of CSF in survivors of Ebola virus disease. Billioux and colleagues found no evidence of the Ebola virus in any of the analyzed CSF samples. This absence could be attributed to the considerable duration since the patients’ discharge. However, it remains possible that the virus could be present in the CNS in a dormant state. Consequently, patients exhibiting symptoms of Ebola virus disease relapse should undergo monitoring of their CSF for the virus.

Reference

Billioux et al. 2017. Cerebrospinal fluid examination in survivors of Ebola virus disease. JAMA Neurology.