Background: Studies on SARS-CoV-2 conducted in confined settings for prolonged times allow researchers to assess how the coronavirus spreads. San Patrignano (SP), Italy, is the largest European drug rehabilitation facility. Methods: Between 15 October and 31 December 2020, all SP residents were tested for SARS-CoV-2. We analyzed the relationships between individual characteristics and being SARS-CoV-2-positive. Three selected predictive models were used to calculate the number of expected hospitalizations. For each model, we summed the estimated individual risks to obtain the expected number of hospitalizations in our sample, and we tested whether the observed and expected numbers differed. Results: Of 807 residents, 529 (65.6%) were SARS-CoV-2-positive. Of these 323 (61.1%) were symptomatic. A strong relationship was found between being positive and living connections (p-value < 0.001). No statistically significant relationship was found with age, sex, smoking history, or comorbidities. Although 9 to 17 hospitalizations were expected, no hospitalizations were observed (p-value < 0.001). No one died of COVID-19. Conclusions: The peculiar characteristics of SP residents or the SP environment might at least partially explain the null hospitalization rates. Despite the extreme uniqueness of our population and despite the protected environment and all precautions that were taken, the fact that the virus was able to circulate and infect a large portion of the population highlights the fundamental role of social interactions in the spread of the disease.
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Sala, I.; Jarach, C.M.; Bagnardi, V.; Cattaruzza, M.S.; Morri, M.; Ottogalli, P.; Zagà, V.; Gallus, S.; Boschini, A. SARS-CoV-2 Infection in San Patrignano, the Largest European Drug Rehabilitation Community. Int. J. Environ. Res. Public Health 2023, 20, 2136.
Sala I, Jarach CM, Bagnardi V, Cattaruzza MS, Morri M, Ottogalli P, Zagà V, Gallus S, Boschini A. SARS-CoV-2 Infection in San Patrignano, the Largest European Drug Rehabilitation Community. International Journal of Environmental Research and Public Health. 2023; 20(3):2136.
Sala, Isabella, Carlotta Micaela Jarach, Vincenzo Bagnardi, Maria Sofia Cattaruzza, Michela Morri, Paolo Ottogalli, Vincenzo Zagà, Silvano Gallus, and Antonio Boschini. 2023. "SARS-CoV-2 Infection in San Patrignano, the Largest European Drug Rehabilitation Community" International Journal of Environmental Research and Public Health 20, no. 3: 2136.
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