References:
Transmission of COVID-19 in 282 clusters in Catalonia, Spain: a cohort study
Robert W. Koops PhD, "The Year of Disguises"
Community and Close Contact Exposures Associated with COVID-19 Among Symptomatic Adults 18 Years and over in 11 Outpatient Health Care Facilities - United States, July 2020
Masking And Case Relationship Charts
403forbidden.us Masking Page
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