Result for
Topic: Transmission
September 17, 2020
Prolonged SARS-CoV-2 Detection and Reversed RT-PCR Results in Mild or Asymptomatic Patients
Many people with mild or asymptomatic COVID-19 (n=300) had prolonged SARS-CoV-2 RNA positivity with intermittent negative tests in a study in Korea. 23% had SARS-CoV-2 detected more than 3 weeks after the initial positive RT-PCR test, and 14% had positive results for more than 4 weeks. Overall, 37% (152/405) of negative results were positive or…
September 15, 2020
SARS-CoV-2 Seroprevalence and Asymptomatic Viral Carriage in Healthcare Workers: A Cross-Sectional Study
A cross-sectional study in April 2020 of asymptomatic healthcare workers (n=545) in the UK found a 2.4% point prevalence of SARS-CoV-2, and 24.4% seroprevalence. Those who reported prior symptomatic illness had higher seroprevalence and greater antibody responses. Healthcare workers who were Black, Asian or minority ethnicity were more likely to be seropositive (OR=1.9), while those…
Transmission of SARS-CoV-2 in Children Aged 0 to 19 Years in Childcare Facilities and Schools after Their Reopening in May 2020, Baden-Württemberg, Germany
A German study analyzed new SARS-CoV-2 infections among children ages 0-19 years old from the time of school reopening through summer holiday (May to August 2020). A total of 137 index cases were identified who attended school or childcare settings for at least 1 day in their infectious period and among these, 6 (4%) index…
Cryptic Transmission of SARS-CoV-2 in Washington State
An analysis of 453 SARS-CoV-2 genomes collected during February and March 2020 in Washington State found that SARS-CoV-2 infections during that time period were derived from a single introduction in late January or early February 2020 that spread undetected before community surveillance was implemented. Bedford et al. (Sept 10, 2020). Cryptic Transmission of SARS-CoV-2 in…
September 14, 2020
Frequency of Children vs Adults Carrying Severe Acute Respiratory Syndrome Coronavirus 2 Asymptomatically
A study among children (n=83) and adults (n=131) hospitalized in Milan, Italy for noninfectious conditions identified 1 child (1%) and 12 (9%) adults who were asymptomatic carriers of SARS-CoV-2, suggesting children without symptoms and signs of SARS-CoV-2 infection may be less likely to be carriers than adults. Milani et al. (Sept 14, 2020). Frequency of…
September 11, 2020
COVID-19 Transmission Within Danish Households A Nationwide Study from Lockdown to Reopening
• [Pre-print, not peer reviewed] A study utilizing Danish registry data found that the proportion of contacts of an initial index case with SARS-CoV-2 infection who tested positive increased in an approximately linear manner with increasing age of the index case. Overall, 17% of household contacts of an index case tested positive within 14 days….
Transmission Dynamics of COVID-19 Outbreaks Associated with Child Care Facilities — Salt Lake City, Utah, April–July 2020
Analysis of contact tracing data in Salt Lake County, Utah identified outbreaks of COVID-19 in three child care facilities linked to index cases in adults and associated with transmission from children to other contacts outside of the facilities. In these three outbreaks, 54% of the cases linked to the child care facilities occurred in children….
September 10, 2020
Community and Close Contact Exposures Associated with COVID-19 Among Symptomatic Adults ≥18 Years in 11 Outpatient Health Care Facilities — United States, July 2020
• Adults with a positive SARS-CoV-2 RT-PCR test were approximately twice as likely to have reported dining at a restaurant than were those with a negative test in an investigation among outpatients seen at 11 US health care facilities. Close contact with persons with known COVID-19 was also associated with a positive SARS-CoV-2 test. Fisher et…
Environmental and Aerosolized SARS-CoV-2 Among Hospitalized COVID-19 Patients
Among more than 400 samples from 20 hospitalized patients with COVID-19, their hospital rooms(fomites and aerosols), and their close ontacts, Binder et al. found low molecular prevalence andlack of viable SARS-CoV-2 virus on fomites and in air samples. The authors conclude that this implieslow nosocomial risk of SARS-CoV-2 transmission through inanimate objects or aerosols. Among…
September 9, 2020
COVID-19 Prevalence among People Experiencing Homelessness and Homelessness Service Staff during Early Community Transmission in Atlanta, Georgia, April-May 2020
In Atlanta, Georgia, people experiencing homelessness who were living in shelters had higher SARS-CoV-2 prevalence compared with those living unsheltered (2% vs. 0.5%). These findings were based on a survey of 2,860 individuals at 24 shelters and 9 unsheltered outreach events undergoing SARS-CoV-2 testing (April 7-May 6, 2020). Prevalence by shelter ranged from 0% to…
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