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Investigating the relationship between interventions, contact patterns, and SARS-CoV-2 transmissibility
Filippo Trentini1, Adriana Manna2, Nicoletta Balbo3
1Dondena Centre for Research on Social Dynamics and Public Policy, Bocconi University, Milan, Italy; Covid Crisis Lab, Bocconi University, Italy; Center for Health Emergencies, Bruno Kessler Foundation, Trento, Italy.
Epidemics
|June 30, 2022
Summary
Italy's tiered COVID-19 restrictions significantly reduced daily social contacts and SARS-CoV-2 transmission. Tighter restrictions led to greater reductions in contacts and the reproduction number, providing valuable data for public health interventions.
Area of Science:
- Epidemiology
- Public Health
- Social Sciences
Background:
- Italy implemented a three-tiered COVID-19 restriction system in Fall 2020 to increase physical distancing.
- The impact of these tiered measures on daily interactions and social mixing patterns remains unclear.
Purpose of the Study:
- To monitor changes in social contact patterns during different COVID-19 restriction levels in Milan, Italy.
- To quantify the impact of tiered restrictions on social mixing and SARS-CoV-2 transmission potential.
Main Methods:
- A survey was conducted from July 2020 to March 2021.
- Negative binomial regression models analyzed daily contacts; age-specific contact matrices were estimated.
- Relative changes in SARS-CoV-2 transmission potential were quantified based on estimated mixing patterns.
Main Results:
- Daily contacts decreased progressively with tighter restrictions: 15.9% (yellow tier) to 41.8% (red tier).
- Higher restrictions increased the proportion of within-household contacts.
- SARS-CoV-2 reproduction number (R0) decreased by 17.1% (yellow), 25.1% (orange), and 44.7% (red tiers).
Conclusions:
- Restriction levels significantly shape social contacts and reduce SARS-CoV-2 transmission potential.
- Estimates provide operational insights for anticipating the effects of tiered restrictions on the reproduction number in evolving epidemiological situations.
Keywords:
COVID-19Human behaviorMixing patternsNon-pharmaceutical interventionsReproduction numberSARS-CoV-2Social contactsTiersTransmissibilityMore Related Videos
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