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Updated: Aug 15, 2026

Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination
Published on: September 25, 2014
Cluster of serogroup C meningococcal disease associated with attendance at a party
1Infectious Diseases Epidemiology Research Unit, Department of Epidemiology, University of Pittsburgh Graduate School of Public Health and School of Medicine, 15261, USA.
Background:
An unexplained increase has occurred in the incidence of invasive meningococcal disease in adolescents and young adults.
Methods:
We investigated a cluster of serogroup C meningococcal disease in 3 previously healthy young adults who had attended a party in Maryland. Molecular subtyping was done on the isolates from the 3 cluster cases and 4 control isolates by pulsed-field gel electrophoresis (PFGE). The only common exposure was attendance at the party, where a large number of people reportedly smoked tobacco or marijuana and/or drank alcohol.
Results:
The PFGE analysis of the 3 case isolates showed identical molecular subtypes.
Conclusion:
This investigation strongly suggests that transmission of the cluster strain occurred at the party. Transmission may have occurred in part as a result of the recently described risk factors of binge drinking and smoking. Taken together, these findings suggest that some of the recent increase in invasive meningococcal disease may be due to modifiable risk factors.
Insights
An increase in invasive meningococcal disease in young adults was investigated. A party linked to three cases suggests transmission occurred due to binge drinking and smoking.
Area of Science:
- Public Health
- Epidemiology
- Infectious Disease
Background:
- An unexplained rise in invasive meningococcal disease (IMD) incidence among adolescents and young adults has been observed.
- Serogroup C strains are a significant cause of IMD.
Observation:
- A cluster of three IMD cases in young adults was investigated.
- All cases attended a single social gathering in Maryland.
- Molecular subtyping via pulsed-field gel electrophoresis (PFGE) was performed on isolates.
Findings:
- PFGE analysis revealed identical molecular subtypes for all three case isolates.
- The common exposure identified was attendance at the party.
- Reported activities at the party included alcohol consumption and smoking (tobacco/marijuana).
Implications:
- The investigation strongly suggests the party facilitated transmission of the specific meningococcal strain.
- Binge drinking and smoking are identified as potential contributing factors to disease transmission.
- These modifiable risk factors may explain some of the recent increase in IMD.
Related Concept Videos
Bacterial Meningitis
Streptococcal Pharyngitis
Viral Meningitis
Cryptococcal Meningitis
Bacterial Meningitis I: Introduction
Bacterial Meningitis II: Pathophysiology

