Result for
Tag: transmission
December 21, 2020
Household Bubbles and COVID-19 Transmission Insights from Percolation Theory
[Pre-print, not peer-reviewed] After developing a network description of households in the UK, and using a configuration model to link households, bubbling scenarios in which single-person households join with another household had a minimal impact on network connectivity and transmission potential (increase in reproduction number of 0.3). Scenarios where all households formed a bubble were…
No Evidence of Association between Schools and SARS-CoV-2 Second Wave in Italy
[Pre-print, not peer-reviewed] There was no evidence from a prospective study that school reopenings across Italy drove the second wave of SARS-CoV-2 infections. Analysis of data from 20 regions indicated that from September 12 to November 7, new SARS-CoV-2 cases among elementary and middle school students was an average of 39% lower than in the…
Transmission of SARS-CoV-2 before and after Symptom Onset Impact of Nonpharmaceutical Interventions in China
[Pre-print, not peer-reviewed] Using serial interval data from infector-infectee pairs before and after the rollout of non-pharmaceutical interventions (NPIs) in China (January and February 2020), the relative frequency of pre-symptomatic transmission increased from 34% pre-rollout to 71% post-rollout. After the rollout of NPIs, transmission post-symptom onset was reduced by 82% whereas pre-symptomatic transmission decreased by…
December 18, 2020
Postmortem Stability of SARS-CoV-2 in Nasopharyngeal Mucosa
Infectious SARS-CoV-2 virus is persistent in postmortem tissue. A study of SARS-CoV-2 postmortem viral RNA stability found evidence for maintained infectivity of the virus from the tissues of deceased individuals, and no time-dependent decrease in viral load. There was also no correlation between the postmortem interval (time of death until cooling at 4°C; median 17.8…
December 17, 2020
SARS-CoV-2 Detected on Environmental Fomites for Both Asymptomatic and Symptomatic COVID-19 Patients
SARS-CoV-2 RNA was detected on surfaces in the rooms of both symptomatic and asymptomatic SARS-CoV-2 infected patients in a hospital in Shenzen, China. Among asymptomatic patients, samples from squat toilets showed the highest positivity rate, followed by samples related to mouth or nose contact (e.g. water cup, straw), and then samples from inside masks worn…
December 16, 2020
Nursing Home Staff Networks and COVID-19. Proceedings of the National Academy of Sciences of the United States of America
A higher degree of connectedness between nursing homes via shared staff and contractors was associated with reporting COVID-19 cases. A large-scale analysis of nursing home connections via shared staff and contractors that used smartphone geolocation data found that 5% of smartphone users who visited a nursing home for at least one hour also visited another…
December 15, 2020
Community Prevalence of SARS-CoV-2 in England from April to November, 2020: Results from the ONS Coronavirus Infection Survey
A nationwide serial sampling study in England (n=1.1 million samples from 280,000 individuals) shows that the first wave (April to June) and the first part of the second wave (August to November) were characterized by different risk factors. Having a patient-facing role was a significant factor in the first wave but not in the second,…
Factors Associated with Positive SARS-CoV-2 Test Results in Outpatient Health Facilities and Emergency Departments Among Children and Adolescents Aged <18 Years — Mississippi, September–November 2020
In a case-control study of 397 children and adolescents in Mississippi, in-person school or child care attendance two weeks prior to a SARS-CoV-2 test was not associated with a positive test result (aOR=0.8). Close contact with persons with COVID-19 (aOR=3.2), gatherings with persons outside the household such as social functions (aOR=2.4) and playdates (aOR=3.3), and…
Assessment of the Risk of SARS-CoV-2 Reinfection in an Intense Re-Exposure Setting
Among 101,349 lab-confirmed SARS-CoV-2 cases in Qatar, the risk of reinfection was estimated to be 0.02%, with a reinfection incidence rate of 0.36 per 10,000 person-weeks. Out of 243 patients with at least one positive swab ≥45 days from the first positive swab, 54 (22%) had strong or good evidence for reinfection. Viral genome sequencing…
December 14, 2020
Environmental Monitoring Shows SARS-CoV-2 Contamination of Surfaces in Food Plants
[Preprint, not peer-reviewed] In a study collecting 22,643 surface samples from 116 food processing facilities in the US from Mar 17 to Sep 3, 2020, 1.2% of the total samples tested positive for SARS-CoV-2 by PCR. 62 (53%) facilities had at least one sample positive for SARS-CoV-2. Among the positive samples, 33% were found on…
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