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Risk Stratification of SARS-CoV-2 Breakthrough Infections Based on an Outbreak at a Student Festive Event
Ralph Bertram1, Vanessa Bartsch2, Johanna Sodmann2
1Institute of Clinical Hygiene, Medical Microbiology and Infectiology, Klinikum Nürnberg, Paracelsus Medical University, 90419 Nuremberg, Germany.
Vaccines
|March 26, 2022
Summary
Breakthrough infections with the delta variant were common at a vaccinated student event. Preventive measures like high-quality testing are crucial for gatherings to limit COVID-19 spread.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Coronavirus disease 2019 (COVID-19) continues to be a global health concern.
- Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) variants, including Delta, drive ongoing transmission.
- Vaccination is a key strategy, but breakthrough infections can occur.
Purpose of the Study:
- To investigate an outbreak of SARS-CoV-2 breakthrough infections at a student event.
- To identify risk factors associated with infection in a predominantly vaccinated population.
- To assess the effectiveness of preventive measures during gatherings.
Main Methods:
- Retrospective guest interviews were conducted following a student festive event.
- Data were collected from 95 fully vaccinated participants.
- Correlation analyses were performed on 15 variables to identify infection risk factors.
Main Results:
- 24 participants were infected with the SARS-CoV-2 Delta variant.
- Significant risk factors included time spent at the event, conversation with the index person, and homologous viral vector vaccination.
- Time since vaccination, shared drinking vessels, and contact numbers were not significant risk factors.
Conclusions:
- High rates of Delta variant breakthrough infections occurred when preventive measures were absent.
- High-quality testing should be mandatory for all attendees at gatherings, regardless of vaccination status.
- Implementing preventive strategies is essential to mitigate infection risks at social events.
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