Fatal Human Meningoencephalitis due to Halicephalobus Nematodes, Germany

Area of Science:

• Veterinary Neurology
• Human Infectious Diseases
• Parasitology

Background:

• Halicephalobus nematodes are known causative agents of severe meningoencephalitis in horses.
• Human infections with these nematodes are exceptionally rare.
• Meningoencephalitis presents a significant diagnostic challenge, particularly in sporadic human cases.

Purpose of the Study:

• To describe the clinical, serological, cytokine, and histopathological findings of a rare human Halicephalobus infection.
• To document the progression and outcome of a rapidly fatal meningoencephalitis case.
• To highlight the utility of molecular diagnostics in identifying the causative helminth.

Main Methods:

• Clinical case reporting and detailed patient observation.
• Serological and cytokine profiling.
• Post-mortem histopathological examination of affected tissues.
• Specific polymerase chain reaction (PCR) assays for helminth identification.

Main Results:

• A previously healthy individual developed a rapidly progressive and fatal meningoencephalitis.
• Clinical presentation, serological markers, and cytokine profiles were documented.
• Histopathology revealed characteristic lesions consistent with helminthic encephalitis.
• Specific PCR confirmed the presence of Halicephalobus nematode DNA in post-mortem tissues.

Conclusions:

• This report underscores the potential, albeit rare, for Halicephalobus nematodes to cause severe meningoencephalitis in humans.
• Early and accurate diagnosis, potentially aided by molecular methods, is crucial for understanding and managing such infections.
• The findings contribute to the limited knowledge base of human neurohelminthiasis.