A rare case of meningitis due to Neisseria meningitidis group 29E

Area of Science:

• Neurology
• Infectious Diseases
• Otolaryngology

Background:

• Meningitis is a serious infection of the membranes surrounding the brain and spinal cord.
• Neisseria meningitidis is a common cause of bacterial meningitis, with different serogroups having varying clinical significance.
• Serum sensitivity of Neisseria meningitidis typically indicates it is less likely to cause invasive disease in immunocompetent individuals.

Observation:

• A case of meningitis was diagnosed in an otherwise healthy young man.
• The causative agent was identified as Neisseria meningitidis group 29E.
• This specific strain was found to be serum-sensitive, which was unexpected given the patient's immune status.

Findings:

• A history of trauma to the tympanic membrane and middle ear, resulting from a road traffic accident 18 months prior, was identified as a predisposing factor.
• The ear trauma created a pathway for direct infection of the meninges by Neisseria meningitidis.
• The patient's immunological competence did not prevent infection, highlighting the role of the direct anatomical breach.

Implications:

• This case underscores the importance of considering pre-existing anatomical vulnerabilities in the pathogenesis of meningitis.
• Direct otogenic spread of Neisseria meningitidis can occur even in immunocompetent hosts if the protective barriers are compromised.
• Surgical intervention, specifically myringoplasty, was effective in closing the defect and preventing recurrent meningeal infections.