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Topic: Transmission
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…
April 19, 2021
Increased Transmissibility of SARS-CoV-2 Lineage B.1.1.7 by Age and Viral Load Evidence from Danish Households
[Pre-print, not peer-reviewed] Among Danish households in which an index case was infected with the SARS-CoV-2 B.1.1.7 lineage, the attack rate was 38%, compared to 27% in households with an index case infected with other lineages. A study of 5,241 households with index cases (n = 808 B.1.1.7 and n = 4,433 other lineages) conducted…
SARS-CoV-2 Transmission in a Georgia School District — United States, December 2020–January 2021
A study of SARS-CoV-2 transmission in a Georgia public school district found that indoor sports may pose a high infection risk in school settings. From December 1, 2020 to January 22, 2021, 85 SARS-CoV-2 index cases and 1,119 contacts were identified by school and public health officials, with 59 contacts testing positive. Among 55 contacts…
April 14, 2021
Neonatal SARS-CoV-2 Infections in Breastfeeding Mothers
No evidence of SARS-CoV-2 infection was found among newborns born to mothers positive for SARS-CoV-2 (n = 55) who were separated from mothers post-delivery. All newborns tested negative for SARS-CoV-2 post-delivery, and 75% were fed unpasteurized, expressed breast milk during the separation until discharge. 89% of neonates were discharged after mothers were instructed in anti-infection…
Laboratory Modeling of SARS-CoV-2 Exposure Reduction Through Physically Distanced Seating in Aircraft Cabins Using Bacteriophage Aerosol — November 2020
A laboratory model of airborne SARS-CoV-2 transmission on single- and twin-aisle aircraft found that exposures were reduced by 23-57% in seating scenarios when the middle seat was left vacant compared to when every seat was filled. Data from a study which examined aerosolized dispersion of a non-pathogenic respiratory virus in various airline cabin mock-ups from…
The Effect of In-Person Primary and Secondary School Instruction on County-Level SARS-CoV-2 Spread in Indiana
A county-level population-based study in Indiana found that for every 10% increase in the proportion of students attending in-person instruction, daily risk of SARS-CoV-2 infection increased by 0.336 per 100,000 population. This corresponds to an overall 0.8% increase over the expected number of cases 28 days later. The authors note that this increase is very…
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