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Meningococcal disease at the University of Southampton: outbreak investigation
1Portsmouth and South East Hampshire Health Authority, Portsmouth, USA.
Abstract:
In October 1997, an outbreak of meningococcal disease occurred at the University of Southampton. All six cases were first year students living in halls of residence. Microbiological characterization of case and carrier strains, case interviews, and a meningococcal carriage prevalence survey were used to investigate the outbreak. Five cases were due to serogroup C strains, one case was unconfirmed. Serotyping did not distinguish between the strains but gene sequencing permitted identification of two distinct strains in the outbreak. Although none of the cases was known to each other, three had attended the same nightclub one evening 3-4 days before illness. Meningococcal carriage rates in undergraduates were within the range expected (147/587, 25%), but no carriers of outbreak strains were identified in this sample. The findings suggest that in communities with a high degree of social interaction, the introduction of highly virulent meningococcal strains may result in enhanced transmission with clustering of cases.
Insights
A meningococcal disease outbreak in 2007 among university students highlights how virulent strains can spread rapidly in social settings. Investigations identified distinct strains, emphasizing the need for vigilance in high-interaction communities.
Area of Science:
- Epidemiology
- Microbiology
- Public Health
Background:
- Meningococcal disease outbreaks pose significant risks to community health, particularly in densely populated environments like university campuses.
- Understanding the transmission dynamics of Neisseria meningitidis is crucial for effective outbreak control.
Purpose of the Study:
- To investigate the characteristics and transmission of a meningococcal disease outbreak at the University of Southampton in October 1997.
- To identify the specific strains involved and assess carriage rates within the student population.
Main Methods:
- Microbiological analysis of case and carrier strains, including serotyping and gene sequencing.
- Epidemiological investigation through case interviews and a meningococcal carriage prevalence survey.
Main Results:
- Six cases of meningococcal disease were identified, primarily among first-year students in halls of residence.
- Five cases were linked to serogroup C strains; gene sequencing revealed two distinct outbreak strains.
- While overall carriage rates were typical (25%), no carriers of the outbreak strains were detected in the surveyed sample.
- A potential link was identified through a shared nightclub visit 3-4 days prior to illness onset for three cases.
Conclusions:
- The introduction of highly virulent meningococcal strains into communities with high social interaction can lead to enhanced transmission and case clustering.
- Rapid identification of distinct strains through molecular methods is vital for understanding outbreak dynamics.
- Effective public health interventions may be necessary in settings with intense social mixing to mitigate disease spread.