Result for
Topic: Transmission
March 1, 2021
Retail Store Customer Flow and COVID-19 Transmission
A mathematical model analyzing retail customer flow and SARS-CoV-2 transmission found that then restricting customers to one-way movement could reduce transmission rates to less than one-third of the rate with two-way movement, if all customers comply and transmission occurs primarily through close contact. The model was calibrated using published epidemiologic data and predicted that for…
February 25, 2021
Household Secondary Attack Rate of COVID-19 by Household Size and Index Case Characteristics
[Pre-print, not peer-reviewed] A population-wide study in Ontario, Canada including nearly 85,000 household contacts from nearly 30,000 households between July to November 2020 found that, while the overall household secondary attack rate (SAR) for SARS-CoV-2 transmission was 20%, 12% of households had a SAR ≥75%. Households in which the index case was symptomatic and had…
SARS-CoV-2 Detection and Genomic Sequencing from Hospital Surface Samples Collected at UC Davis
[Pre-print, not peer-reviewed] Environmental samples (n=224) collected from COVID-19 patient serving and staff congregation areas in a university hospital in California between April and August 2020 identified 11 samples positive for SARS-CoV-2 RNA, with a smaller proportion of positive samples (2% vs 11%) detected over time as improved cleaning and patient management practices were implemented. …
A Novel SARS-CoV-2 Variant of Concern B.1.526 Identified in New York
[Pre-print, not peer-reviewed] The prevalence of SARS-CoV-2 isolates with the E484K mutation, a key mutation of the B.1.351 variant, rose from 1.3% to 12.3% between November 2020 to mid-February 2021 in New York City. In a subset of 65 samples suspected to contain key mutations, 49 fell within a single novel lineage (B.1.526) characterized by…
February 24, 2021
Community Transmission of SARS-CoV-2 at Three Fitness Facilities — Hawaii, June–July 2020
An outbreak of COVID-19 cases occurred that was linked to a fitness instructor resulting in cases at 3 fitness facilities, with the highest attack rate (95%) occurring in classes that were taught <1 day before the onset of symptoms in the instructor. Twenty-one cases of COVID-19 were linked to an index case fitness instructor in…
COVID-19 Outbreak Among Attendees of an Exercise Facility — Chicago, Illinois, August–September 2020
A large outbreak of COVID-19 occurred among attendees of indoor high-intensity classes at a Chicago exercise facility in August, 2020, with 55 cases identified among 81 attendees (68% attack rate). All classes were held at reduced capacity (<25%), temperature checks were required upon entry, and participants were required to space mats at least 6 feet…
February 23, 2021
Reopening Schools in the Context of Increasing COVID-19 Community Transmission: The French Experience
Children and adolescents in France had lower risk of a positive SARS-CoV-2 PCR test and lower incidence of infection compared to adults during the first 2 months of the 2020-2021 school year (August to October 2020), though risk among older adolescents was close to that of adults. Schools re-opened with infection control measures in place,…
February 22, 2021
SARS-CoV-2 Shedding Dynamics Across the Respiratory Tract Sex and Disease Severity for Adult and Pediatric COVID-19
[Pre-print, not peer-reviewed] A systematic review and pooled analysis of SARS-CoV-2 shedding dynamics in the upper (URT) and lower (LRT) respiratory tracts found that severe COVID-19 in adults was characterized by high, persistent shedding of SARS-CoV-2 virus in the LRT. In the URT, adults with severe COVID-19 had higher respiratory viral loads 1 day post-symptom…
Reported COVID-19 Incidence in Wisconsin High School Athletes During Fall 2020
[Pre-print, not peer-reviewed] A study of COVID-19 in high school athletes in Wisconsin in September 2020 showed that 207 schools that reinitiated sports reported 270 COVID-19 cases among 30,074 players, for case and incidence rates of 809 cases per 100,000 players and 32.6 cases per 100,000 player-days, respectively. 115 (55%) cases were attributed to household…
Disparate Patterns of Movements and Visits to Points of Interest Located in Urban Hotspots across US Metropolitan Cities during COVID-19
A study examining the effect of social distancing on changes in visits to urban hotspot points of interest (POIs) in US cities from January to May 2020 found that one group of cities, including San Francisco, Seattle, and Chicago, there was a substantial decrease in hotspot POI visitors, while in another group, including Austin, Houston…
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