Neurological Manifestations of Scrub Typhus

Area of Science:

• Infectious Diseases
• Neurology
• Public Health

Background:

• Scrub typhus, caused by Orientia tsutsugamushi, is increasingly prevalent in South and Southeast Asia.
• Neurological complications affect approximately 20% of patients with scrub typhus, involving both central and peripheral nervous systems.
• The classic sign is an eschar, but its absence does not rule out the diagnosis.

Purpose of the Study:

• To review the spectrum of neurological complications associated with scrub typhus.
• To increase clinician awareness of scrub typhus as a differential diagnosis for acute febrile illnesses with neurological features in endemic areas.
• To emphasize the importance of early diagnosis and treatment to reduce morbidity and mortality.

Main Methods:

• Review of current literature on scrub typhus and its neurological manifestations.
• Discussion of diagnostic methods including serological tests (ELISA, indirect fluorescent antibody), PCR, LAMP assay, and metagenomic next-generation sequencing (mNGS).
• Analysis of postulated pathomechanisms including direct invasion, vasculitis, and immune-mediated injury.

Main Results:

• A wide range of neurological syndromes are associated with scrub typhus, including meningitis, encephalitis, myelitis, cranial nerve palsies, and cerebrovascular diseases.
• Diagnostic confirmation typically relies on detecting IgM antibodies, though molecular methods are also available.
• Neurological symptoms often respond well to doxycycline therapy.

Conclusions:

• Scrub typhus presents with diverse neurological complications that require prompt recognition and management.
• Clinicians in endemic regions must consider scrub typhus in patients with acute febrile illness and neurological signs.
• Timely diagnosis and appropriate antibiotic treatment, primarily doxycycline, are essential for favorable outcomes.