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Tag: transmission
August 27, 2020
Population-Scale Longitudinal Mapping of COVID-19 Symptoms, Behaviour and Testing
How We Feel (http://www.howwefeel.org), a web and mobile application, collected 3.6 million longitudinal self-reported survey responses on health, behavior related to the COVID-19 pandemic, and demographics from over 500,000 users across all 50 US states and several US territories (83% female, 76% white) during April 2 – May 12, 2020. Among 3,829 users who used…
Particle Modeling of the Spreading of Coronavirus Disease (COVID-19)
De-Leon and Pederiva present a kinetic Monte Carlo algorithm that shows that a cyclic schedule of no-restrictions/lockdowns that includes at least ten days of lockdown for each cycle can help control SARS-CoV-2 transmission. In particular, this model reduces the infection rate when accompanied by social distancing and complete isolation of symptomatic patients. The comparison between…
Notes from the Field: Universal Statewide Laboratory Testing for SARS-CoV-2 in Nursing Homes — West Virginia
During March 17–April 16, 2020, 307 COVID-19 cases were reported among residents and staff members in 7 nursing homes in West Virginia, 4 of which had outbreaks involving 20–40 residents. In response, the governor ordered universal testing among all 123 nursing homes in the state (April 21–May 8), which resulted in the identification of 42…
August 25, 2020
Phylogenetic Analysis of SARS-CoV-2 in the Boston Area Highlights the Role of Recurrent Importation and Superspreading Events
[pre-print, not peer-reviewed] Lemieux et al. conducted phylogenetic analyses on 772 complete SARS-CoV-2 genomes from the Boston area and found that, since the beginning of the epidemic, there were over 80 introductions into the Boston area, primarily from other parts of the United States and Europe. Investigators studied two distinct superspreading events captured in the…
Time Course of a Second Outbreak of COVID-19 in Beijing, China
After 56 consecutive days of no local transmission events of COVID-19 in Beijing, a new case was diagnosed on June 11, triggering an outbreak alert. The first 2 confirmed cases were found to have epidemiologic links to a local market, which was shut down on June 12. Among the 368 people who tested positive and…
August 24, 2020
Asymptomatic Transmission of SARS-CoV-2 on Evacuation Flight. Emerging Infectious Diseases
Bae et al. report a single incidence of possible transmission of COVID-19 during an evacuation flight from Italy to South Korea. After airport screening, 299 asymptomatic passengers took an 11-hour flight to South Korea, during which most of them wore N95 respirators at all times. They were tested for SARS-CoV-2 by RT-PCR on days 1…
August 21, 2020
Limited Secondary Transmission of SARS-CoV-2 in Child Care Programs — Rhode Island
• Link-Gelles et al. report 52 confirmed and probable childcare-associated cases of COVID-19 in 29 childcare programs in the state of Rhode Island in the two months following reopening of childcare programs on June 1. Of the cases, 30 (58%) were among children (median age = 5 years), and 22 (42%) were among adults (20…
Characterizing Super-Spreading Events and Age-Specific Infectivity of COVID-19 Transmission in Georgia USA
• [pre-print, not peer-reviewed] An analysis of COVID-19 cases in Georgia found that 2% of cases were directly responsible for 20% of infections, with infected people under 60 infecting 2.8-times more people than older persons. Lau et al. incorporated individual-level surveillance data with geolocation data and aggregate mobility data to analyze transmission of COVID-19 in…
August 20, 2020
Automated and Partly Automated Contact Tracing: A Systematic Review to Inform the Control of COVID-19
• A systematic review of 15 studies published from Jan 1 to April 30, 2020 reported no empirical epidemiological evidence regarding the effectiveness of automated contact tracing tools, in contrast to manual contract tracing, for identifying contacts or reducing transmission of respiratory viral infections. Four modelling studies estimated that controlling COVID-19 requires a high population…
August 11, 2020
Prevalence of SARS-CoV-2 Infection Among Health Care Workers in a Tertiary Community Hospital
At a large tertiary community hospital in New York City, the rate of SARS-CoV-2 infection among health care workers (n=3,046) was lower than what has been reported for the general public in the surrounding region. Among the hospital employees, 10% tested positive for antibodies, compared to seroprevalence estimates of 21% for New York City and 17% for Long Island. There were no…
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