Limitations of PCR-based detection of Neisseria meningitidis: The potential influence of non-encapsulated strains on diagnostic failure.
Miguel Fernández-Huerta, Eduardo Lagarejos, Iballa Horcajada et al.
✦ AI-curated · Sources linked
Case in brief
An immunocompetent patient presented with culture-positive meningococcal meningitis caused by a non-encapsulated strain. Despite the confirmed diagnosis through culture, commercially-available real-time PCR assays failed to detect the pathogen, highlighting a significant diagnostic challenge in such cases.
What made this case unusual
The case is notable for the negative PCR results despite the presence of a non-encapsulated strain of Neisseria meningitidis, which is typically detectable by standard assays.
Diagnostic / clinical pearl
Clinicians should be aware that non-encapsulated strains of Neisseria meningitidis may lead to false-negative results in PCR assays, potentially delaying diagnosis and treatment.
Why it matters
This case underscores the limitations of PCR-based detection methods in identifying certain strains of pathogens, emphasizing the need for awareness of potential diagnostic pitfalls.