SARS-CoV-2 transmission in the Lombardy Region: the increase of household contagion and its implication for containment measures

Main Article Content

Carlo Signorelli
Anna Odone
Giuseppe Stirparo
Danilo Cereda
Maria Gramegna
Marco Trivelli
Gianni Rezza

Keywords

SARS-CoV-2, transmission, household, containment

Abstract

This study aimed at the identification of the settings linked to SARS-CoV-2 transmission through the analysis of clusters and small outbreaks detected by the Lombardy Region surveillance system during the second epidemic wave. Comparing the data before and after the introduction of restrictive measures (night curfew, partial closure of schools and businesses, smaart working), we observed a significant decrease of infections in workplaces, social gatherings, coffee shops, restaurants, and sports centers; contagion in schools decreased from 9.2% to 3.4%, in hospitals environments and nursing homes from 5% to 2%; domestic infections increased instead from 73.5% to 92.7%. These results suggest that containment measures have been effective in controlling virus circulation in the community but not at the household level and might inform future interventions, including the establishment of structures (Covid Hotels) for the isolation infected people. At the same time, they raise awareness on the risk of transmission among family members and during households social gatherings.

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References

1. Chan JF, Yuan S, Kok KH, To KK, Chu H, Yang J, et al. A familial cluster of pneumonia associated with the 2019 novel coronavirus indicating person-to-person transmission: a study of a family cluster. Lancet (London, England). 2020;395(10223):514-23.
2. Odone A, Delmonte D, Scognamiglio T, Signorelli C. COVID-19 deaths in Lombardy, Italy: data in context. The Lancet Public health. 2020;5(6):e310.
3. Signorelli C, Scognamiglio T, Odone A. COVID-19 in Italy: impact of containment measures and prevalence estimates of infection in the general population. Acta bio-medica : Atenei Parmensis. 2020;91(3-s):175-9.
4. DPCM, 8 marzo 2020. Gazz Uff della Repubb Ital. “Ulteriori disposizioni attuative del decreto-legge 23 febbraio 2020, n. 6, recante misure urgenti in materia di contenimento e gestione dell’emergenza epidemiologica da COVID-19.”.
5. Istituto Superiore Di Sanita. Available at: https://www.iss.it/coronavirus. [accessed: 20.11.2020].
6. Amerio A, Brambilla A, Morganti A, Aguglia A, Bianchi D, Santi F, et al. COVID-19 Lockdown: Housing Built Environment's Effects on Mental Health. International journal of environmental research and public health. 2020;17(16).
7. Odone A, Lugo A, Amerio A, Borroni E, Bosetti C, Carreras G, et al. COVID-19 lockdown impact on lifestyle habits of Italian adults. Acta bio-medica : Atenei Parmensis. 2020;91(9-s):87-9.
8. DPCM, del 3 novembre 2020. Gazz Uff della Repubb Ital. “Ulteriori disposizioni attuative del decreto-legge 25 marzo 2020, n. 19, convertito, con modificazioni, dalla legge 25 maggio 2020, n. 35, recante «Misure urgenti per fronteggiare l’emergenza epidemiologica da COVID-19», e del decreto-legge 16 maggio 2020, n. 33, convertito, con modificazioni, dalla legge 14 luglio 2020, n. 74, recante «Ulteriori misure urgenti per fronteggiare l’emergenza epidemiologica da COVID-19».".
9. Ordinanza n. 623 Regione Lombardia. del 21/10/2020. Link: https://www.regione.lombardia.it/wps/wcm/connect/b52df501-feae-4103-b514-1038a5747d46/Ordinanza+623+del+21+ottobre.pdf?MOD=AJPERES&CACHEID=ROOTWORKSPACE-b52df501-feae-4103-b514-1038a5747d46-nlc7zJB [utlimo accesso 20/11/2020]
10. Grijalva CG, Rolfes MA, Zhu Y, McLean HQ, Hanson KE, Belongia EA, et al. Transmission of SARS-COV-2 Infections in Households - Tennessee and Wisconsin, April-September 2020. MMWR Morbidity and mortality weekly report. 2020;69(44):1631-4.
11. Haroon S, Chandan JS, Middleton J, Cheng KK. Covid-19: breaking the chain of household transmission. BMJ (Clinical research ed). 2020;370:m3181.
12. Del Brutto OH, Costa AF, Mera RM, Recalde BY, Bustos JA, García HH. Household Clustering of SARS-CoV-2 in Community Settings: A Study from Rural Ecuador. The American journal of tropical medicine and hygiene. 2020;103(3):1207-10.