medRxiv preprint doi: https://doi.org/10.1101/2020.09.18.20195776; this version posted September 18, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission. Urban rail transport and SARS-CoV-2 infections: an ecological study in Lisbon Metropolitan Area Milton Severo1,2*, Ana Isabel Ribeiro1, Raquel Lucas1,2, Teresa Leão1,2 & Henrique Barros1,2 1-EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas, nº 135, 4050-600 Porto, Portugal. 2-Departamento de Ciências da Saúde Pública e Forenses e Educação Médica, Faculdade de Medicina, Universidade do Porto, Porto, Portugal. *Corresponding author Milton Severo EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas, nº 135, 4050-600 Porto, Portugal Tel: +351 222061820 Fax: +351 222061821 e-mail:
[email protected] AUTHORSHIP CONTRIBUTION STATEMENT Milton Severo: Conceptualization, Statistical analysis, Interpretation of the results, Writing - review & editing. Ana Isabel Ribeiro: Geographical data processing, Interpretation of the results, Writing – original. Raquel Lucas: Interpretation of the results, Writing - review & editing. Teresa Leão: Interpretation of the results, Writing - review & editing. Henrique Barros: Conceptualization, Supervision, Interpretation of the results, Writing - review & editing. ACKNOWLEDGMENTS The authors are grateful to Direção-Geral da Saúde for providing the data from the National Epidemiological Surveillance System (SINAVE). NOTE: This preprint reports new research that has not been certified by peer review and should not be used to guide clinical practice. medRxiv preprint doi: https://doi.org/10.1101/2020.09.18.20195776; this version posted September 18, 2020.