High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020.

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  • Additional Information
    • Affiliation:
      Skagit County Public Health, Mount Vernon, Washington
    • Subject Terms:
    • Subject Terms:
    • Abstract:
      On March 17, 2020, a member of a Skagit County, Washington, choir informed Skagit County Public Health (SCPH) that several members of the 122-member choir had become ill. Three persons, two from Skagit County and one from another area, had test results positive for SARS-CoV-2, the virus that causes coronavirus disease 2019 (COVID-19). Another 25 persons had compatible symptoms. SCPH obtained the choir's member list and began an investigation on March 18. Among 61 persons who attended a March 10 choir practice at which one person was known to be symptomatic, 53 cases were identified, including 33 confirmed and 20 probable cases (secondary attack rates of 53.3% among confirmed cases and 86.7% among all cases). Three of the 53 persons who became ill were hospitalized (5.7%), and two died (3.7%). The 2.5-hour singing practice provided several opportunities for droplet and fomite transmission, including members sitting close to one another, sharing snacks, and stacking chairs at the end of the practice. The act of singing, itself, might have contributed to transmission through emission of aerosols, which is affected by loudness of vocalization (1). Certain persons, known as superemitters, who release more aerosol particles during speech than do their peers, might have contributed to this and previously reported COVID-19 superspreading events (2-5). These data demonstrate the high transmissibility of SARS-CoV-2 and the possibility of superemitters contributing to broad transmission in certain unique activities and circumstances. It is recommended that persons avoid face-to-face contact with others, not gather in groups, avoid crowded places, maintain physical distancing of at least 6 feet to reduce transmission, and wear cloth face coverings in public settings where other social distancing measures are difficult to maintain.
    • Journal Subset:
      Biomedical; Public Health; USA
    • Instrumentation:
      Social Readjustment Rating Scale (SRRS) (Holmes and Rahe)
    • ISSN:
      0149-2195
    • MEDLINE Info:
      PMID: NLM32407303 NLM UID: 7802429
    • Publication Date:
      In Process
    • Publication Date:
      20200719
    • DOI:
      10.15585/mmwr.mm6919e6
    • Accession Number:
      143215956
  • Citations
    • ABNT:
      HAMNER, L. et al. High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020. MMWR: Morbidity & Mortality Weekly Report, [s. l.], v. 69, n. 19, p. 606–610, 2020. DOI 10.15585/mmwr.mm6919e6. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=rzh&AN=143215956. Acesso em: 28 set. 2020.
    • AMA:
      Hamner L, Dubbel P, Capron I, et al. High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020. MMWR: Morbidity & Mortality Weekly Report. 2020;69(19):606-610. doi:10.15585/mmwr.mm6919e6
    • APA:
      Hamner, L., Dubbel, P., Capron, I., Ross, A., Jordan, A., Lee, J., Lynn, J., Ball, A., Narwal, S., Russell, S., Patrick, D., & Leibrand, H. (2020). High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020. MMWR: Morbidity & Mortality Weekly Report, 69(19), 606–610. https://doi.org/10.15585/mmwr.mm6919e6
    • Chicago/Turabian: Author-Date:
      Hamner, Lea, Polly Dubbel, Ian Capron, Andy Ross, Amber Jordan, Jaxon Lee, Joanne Lynn, et al. 2020. “High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020.” MMWR: Morbidity & Mortality Weekly Report 69 (19): 606–10. doi:10.15585/mmwr.mm6919e6.
    • Harvard:
      Hamner, L. et al. (2020) ‘High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020’, MMWR: Morbidity & Mortality Weekly Report, 69(19), pp. 606–610. doi: 10.15585/mmwr.mm6919e6.
    • Harvard: Australian:
      Hamner, L, Dubbel, P, Capron, I, Ross, A, Jordan, A, Lee, J, Lynn, J, Ball, A, Narwal, S, Russell, S, Patrick, D & Leibrand, H 2020, ‘High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020’, MMWR: Morbidity & Mortality Weekly Report, vol. 69, no. 19, pp. 606–610, viewed 28 September 2020, .
    • MLA:
      Hamner, Lea, et al. “High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020.” MMWR: Morbidity & Mortality Weekly Report, vol. 69, no. 19, May 2020, pp. 606–610. EBSCOhost, doi:10.15585/mmwr.mm6919e6.
    • Chicago/Turabian: Humanities:
      Hamner, Lea, Polly Dubbel, Ian Capron, Andy Ross, Amber Jordan, Jaxon Lee, Joanne Lynn, et al. “High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020.” MMWR: Morbidity & Mortality Weekly Report 69, no. 19 (May 15, 2020): 606–10. doi:10.15585/mmwr.mm6919e6.
    • Vancouver/ICMJE:
      Hamner L, Dubbel P, Capron I, Ross A, Jordan A, Lee J, et al. High SARS-CoV-2 Attack Rate Following Exposure at a Choir Practice - Skagit County, Washington, March 2020. MMWR: Morbidity & Mortality Weekly Report [Internet]. 2020 May 15 [cited 2020 Sep 28];69(19):606–10. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=rzh&AN=143215956