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Tag: transmission
March 19, 2021
COVID-19 in Primary and Secondary School Settings During the First Semester of School Reopening — Florida, August–December 2020
COVID-19 school-related incidence among Florida students was low (August-December 2020), were most schools resumed in-person instruction sometime during August 2020, and was correlated with community incidence and was highest in smaller counties, districts without mask requirements, and those that reopened earliest after closure in March 2020. A total of 63,654 total cases of COVID-19 were…
March 18, 2021
Minimal SARS-CoV-2 Transmission After Implementation of a Comprehensive Mitigation Strategy at a School — New Jersey, August 20–November 27, 2020
A New Jersey private boarding school with high adherence to COVID-19 mitigation protocols reported 17 positive PCR tests among faculty and staff (0.18% of total) and 8 positive tests among students (0.06% of total) during August to November 2020. Case investigations found likely off-campus sources for all but 2 of the positive cases (both students),…
Notes from the Field: SARS-CoV-2 Transmission Associated with High School Football Team Members — Florida, September–October 2020
In an outbreak investigation by the Florida Department of Health, an index case of COVID-19 in a high school football player was linked to an additional 18 confirmed cases (12 players, 2 coaches, and 2 non-player classroom contacts). Because of potential close contact between infected team members and classmates, 267 students at the football team’s…
Estimating the Increased Transmissibility of the B.1.1.7 Strain over Previously Circulating Strains in England Using Fractions of GISAID Sequences and the Distribution of Serial Intervals.
[Pre-print, not peer-reviewed] The SARS-CoV-2 B.1.1.7 strain is suggested to be 40% more transmissible than previously circulating strains, according to a model-based analysis using the time course of the proportion of SARS-CoV-2 infections with the B.1.1.7 variant applied to SARS-CoV-2 genome sequence data and the distribution of serial intervals in England. For mitigation, the authors…
Transmission Dynamics and Timing of Key Events for SARS-CoV-2 Infection in Healthcare Workers
In a retrospective study of healthcare workers (HCWs) in Turkey with SARS-CoV-2 infection (n=149), 98% of symptomatic HCWs had developed symptoms within 14 days of their index case developing symptoms. Among 39 HCW infector-infectee pairs, the median serial interval (time between symptom onset in the pair) was 4 days (IQR: 2-6). The authors suggest that…
March 17, 2021
Spread of a Variant SARS-CoV-2 in Long-Term Care Facilities in England
The proportion of SARS-CoV-2-positive samples that had an S gene target failure (suggestive of the B.1.1.7 strain) rose dramatically in late 2020 in the UK. The number and proportion of samples with S gene target failure increased from 12% to 60% between November 16 and December 13. By December 7, in South East England 57%…
SARS-CoV-2 Epidemiology on a Public University Campus in Washington State
[Pre-print, not peer-reviewed] A SARS-CoV-2 testing program at the University of Washington found that SARS-CoV-2 spread through school-based outbreaks without evidence of spread to the surrounding community. The testing program, which prioritized individuals with symptoms and high-risk exposure, identified 236 cases out of 16,476 tests conducted in the fall of 2020. Affiliation with a university…
SARS-CoV-2 Infection and Transmission in Primary Schools in England in June-December, 2020 (SKIDs): An Active, Prospective Surveillance Study
Results from the COVID-19 surveillance in School KIDSs (sKIDs) study of primary school children in England indicated that SARS-CoV-2 infection rates in primary schools were low following partial and full reopening. During the summer half-term (that began in June 2020), weekly infection rates were 4.1 per 100,000 students and 12.5 per 100,000 staff. Seropositivity for…
March 15, 2021
A Follow-up Study Shows That Recovered Patients with Re-Positive PCR Test in Wuhan May Not Be Infectious
A follow-up study analyzing data from 20,280 COVID-19 patients from multiple centers in Wuhan, China who received a positive PCR result between December 2019 and August 2020 found that 2,466 (12.2%) patients tested positive again (2,238 of were asymptomatic) after being discharged from the hospital. None of the 4,079 close contacts of patients who tested…
Limits of Lockdown Characterising Essential Contacts during Strict Physical Distancing
[Pre-print, not peer-reviewed] During the first lockdown in the UK, essential healthcare workers had 4.5 times as many contacts as non-essential workers (IRR = 4.4), while essential workers in other sectors like teaching and the police force had nearly three times as many contacts (IRR = 2.8), according to a study of participants in a…
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