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Deafness, complement deficiencies and immunoglobulin status in patients with meningococcal diseases due to uncommon
E Mayatepek1, M Grauer, G M Hänsch
1University Children's Hospital, Heidelberg, Germany.
Abstract:
The prevalence of deafness and complement deficiencies in association with meningococcal disease caused by uncommon serogroups of meningococci was studied in 30 patients (Group A) and 30 controls with Serogroup B disease (Group B). In Group A 8 patients (26.6%) had hearing impairment in contrast to only 1 patient (3.3%) in Group B (P < 0.01). Complement deficiency was detected in 8 patients (26.6%) of Group A whereas none of the Group B patients showed a defect in the complement system (P < 0.01). Association between complement deficiencies and meningococcal disease was detected for Serogroups Y (n = 5; 16.6%) and W135 (n = 3; 10.0%). Localization of the defects revealed only complement deficiencies of the classical pathway (C8-beta or C7 defects). The levels of Ig and IgG subclasses were found to be within the normal range for all patients. Our results suggest that meningococcal diseases caused by uncommon serogroups are more often associated with deafness and late complement component defects.
Insights
Meningococcal disease from rare serogroups is linked to higher rates of deafness and complement deficiencies, particularly affecting the classical complement pathway. These findings highlight a significant association between uncommon meningococcal strains and specific immune system defects.
Area of Science:
- Immunology
- Infectious Diseases
- Genetics
Background:
- Meningococcal disease, caused by Neisseria meningitidis, can lead to severe complications.
- Uncommon serogroups of meningococci are less frequently studied than common ones like Serogroup B.
- Deficiencies in the complement system are known risk factors for invasive meningococcal disease.
Purpose of the Study:
- To investigate the association between uncommon meningococcal serogroups and the prevalence of deafness.
- To determine the frequency of complement deficiencies in patients with meningococcal disease caused by uncommon serogroups.
- To identify specific complement pathway defects linked to these infections.
Main Methods:
- A case-control study comparing 30 patients with uncommon serogroup meningococcal disease (Group A) to 30 controls with Serogroup B disease (Group B).
- Assessment of hearing impairment (deafness) in both groups.
- Screening for complement deficiencies, including localization to specific pathways (classical, alternative, or terminal).
- Measurement of immunoglobulin (Ig) and IgG subclass levels.
Main Results:
- Hearing impairment was significantly more prevalent in Group A (26.6%) compared to Group B (3.3%) (P < 0.01).
- Complement deficiencies were detected in 26.6% of Group A patients, versus 0% in Group B (P < 0.01).
- Specific associations were found between complement deficiencies and Serogroups Y and W135.
- Defects were localized to the classical complement pathway, specifically C8-beta or C7 deficiencies.
- Ig and IgG subclass levels were normal in all patients.
Conclusions:
- Meningococcal diseases caused by uncommon serogroups are significantly associated with a higher incidence of deafness.
- Late complement component deficiencies, particularly of the classical pathway, are more common in patients infected with uncommon meningococcal serogroups.
- These findings suggest that complement deficiencies predispose individuals to severe outcomes from infections with less common meningococcal strains.