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Tag: transmission
April 29, 2021
COVID-19 Outbreak Among Farmworkers — Okanogan County, Washington, May–August 2020
Investigation of a large SARS-CoV-2 outbreak among employees of a fruit grower in Okanogan County in Washington State between May and August 2020 found that cumulative incidence of SARS-CoV-2 infection was higher among employees living in the community than those living in congregate temporary housing (12% vs 4%). Cumulative incidence was highest among employees packing…
Detecting In-School Transmission of SARS-CoV-2 from Case Ratios and Documented Clusters
[Pre-print, not peer-reviewed] A SARS-CoV-2 transmission model that accounts for a lower probability of symptomatic infection among children (21%) than adults (70%) found that only roughly 4% of in-school child-to-child transmission would be detectable with symptom-based contact tracing, even if all symptomatic cases are detected. The authors suggest that low in-school detection rates do not…
Impact of Vaccination on Household Transmission of SARS-COV-2 in England
[Pre-print, not peer-reviewed] Vaccinated individuals who became infected with SARS-CoV-2 had a lower rate of secondary household transmission compared to unvaccinated index individuals. Among over 550,000 residential households in the UK between January to March 2021, the overall SARS-CoV-2 secondary attack rate was 5.7% in household where the index case had received at least one…
Linked Clusters of SARS-CoV-2 Variant B.1.351 — Maryland, January–February 2021
A contact tracing investigation in January 2021 initiated after a Maryland resident was confirmed to have SARS-CoV-2 infection with the B.1.351 variant, first described in South Africa, identified two clusters comprised of 17 total patients not linked to travel. Sequencing of samples from the index case and three other patients from both clusters confirmed B.1.351…
COVID-19 Among Workers in the Seafood Processing Industry: Implications for Prevention Measures — Alaska, March–October 2020
A review of COVID-19 cases and outbreaks in the Alaska fishing industry found that entry quarantine and testing might have reduced introduction of the virus to seafood processing facilities and vessels. A CDC field review found that among 132 non-outbreak associated cases of SARS-CoV-2 infection in seafood processing industry workers in Alaska from March to…
April 27, 2021
Comparison of COVID-19 Incidence Rates Before and After School Reopening in Israel
An analysis of SARS-CoV incidence and the rate of test positivity in Israel suggests that children age 0-9 years of age did not have substantially elevated rates of SARS-CoV-2 infection during school attendance. Compared to the period before school reopening, after school reopened in September 2020 there was a 10% increase in SARS-CoV-2 incidence and…
April 22, 2021
SARS-CoV-2 Transmission Risk Among National Basketball Association Players, Staff, and Vendors Exposed to Individuals With Positive Test Results After COVID-19 Recovery During the 2020 Regular and Postseason
Within a cohort of National Basketball Association (NBA) players, staff, and vendors (n=3,648) who maintained a closed environment in Florida from June to October 2020, 36 individuals (1%) had persistently positive PCR results after recovering from SARS-CoV-2 infection. There were no transmission events associated with these persistently positive individuals, who were monitored for an average…
COVID-19 Outbreaks in Correctional Facilities with Work-Release Programs — Idaho, July–November 2020
COVID-19 outbreaks occurred in 5 correctional facilities in Idaho with work-release programs between July and November 2020, leading to 382 outbreak-related cases. 64% of cases were identified through mass testing, with only 14% identified as symptomatic cases. Mitigation strategies at the correctional facilities included mandatory mask wearing and mass testing. Two outbreaks were linked to…
April 21, 2021
COVID-19 Outbreak Associated with a SARS-CoV-2 R.1 Lineage Variant in a Skilled Nursing Facility After Vaccination Program — Kentucky, March 2021
Unvaccinated residents and healthcare personnel (HCP) at a Kentucky skilled nursing facility had a 3 and 4.1-fold higher risk of infection compared to residents and HCP who were vaccinated with the Pfrizer-BioNTech mRNA vaccine, respectively, during a SARS-CoV-2 outbreak identified on March 1, 2021. This outbreak was with a newly-introduced variant to the region called…
April 20, 2021
Attack Rates amongst Household Members of Outpatients with Confirmed COVID-19 in Bergen, Norway: A Case-Ascertained Study
The overall SARS-CoV-2 household attack rate was 45% among 112 index cases and 179 total household contacts in a study conducted in Norway from February to April 2020. Attack rates were equally high in children (48%) and young adults (42%). The attack rate was not associated with household size or with whether or not the…
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