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avel Medicine and Infectious Disease, vol. 42, Aug. VUWR. Morbidity and mortality weekly report vol. of Lancet emy A. et al. Nature 21, https://www.nature.com/. c, et al. "Implication of backward contact Wellcome Open 2search.org. essica Wells, et al. "Epidemiologic 1, 27(6):1677. https://wwwnc.cdc.gov Quarantine: Lessons from Vietnam." Travel Medicine and Infectious Disease, vol. 42, Aug. 2021. 13 "And many of the contacts": Lash, R Ryan et al. "COVID-19 Contact Tracing in Two Counties - North Carolina, June-July 2020." MMWR. Morbidity and mortality weekly report vol. 69. Sep. 25, 2020. 14 "This daily testing": Young BC, Eyre DW, Kendrick S, et al. "Daily testing for contacts of individuals with SARS-CoV-2 infection and attendance and SARS-CoV-2 transmission in English secondary schools and colleges: an open-label, cluster-randomised trial." Lancet, September 2021. 15 "In general, if you start": Billy J. Gardner, A. Marm Kilpatrick, "Contact tracing efficiency, transmission heterogeneity, and accelerating COVID-19 epidemics," PLOS Computational Biology, June 17, 20201. https://journals.plos.org/. 16 "About 70 percent": Dillon C. Adam et al. "Clustering and Superspreading Potential of SARS-CoV-2 Infections in Hong Kong." Nature Medicine, Sept. 2020. 17 "For reasons we don't entirely understand": Kim Sneppen et al. "Overdispersion in COVID-19 Increases the Effectiveness of Limiting Nonrepetitive Contacts for Transmission Control." Proceedings of the National Academy of Sciences of the United States of America, vol. 118, no. 14, Apr. 2021. 18 "Understanding this limitation": Bradshaw, W.J., Alley, E.C., Huggins, J.H. et al. "Bidirectional contact tracing could dramatically improve COVID-19 control," Nature Communications, Jan 2021, https://www.nature.com/. 19 "One study found": Akira Endo, Quentin Leclerc, et al. "Implication of backward contact tracing in the presence of overdispersed transmission in COVID-19 outbreaks," Wellcome Open Res 2021, 5:239, https://wellcomeopenresearch.org. 20 "In Sydney, Australia": Anthea L. Katelaris, Jessica Wells, et al. "Epidemiologic Evidence for Airborne Transmission of SARS-CoV-2 during Church Singing, Australia, 2020." Emerging Infectious Diseases, 2021, 27(6):1677. https://wwwnc.cdc.gov