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Tag: transmission
January 26, 2021
SARS-CoV-2 Transmission Associated with High School Wrestling Tournaments — Florida, December 2020–January 2021
An outbreak arising from a Florida high school wrestling tournament in December 2020 had an attack rate of at least 30% (38 of 126 tournament attendees who were tested) and a secondary attack rate of at least 9% (41 of 441 close contacts of the 38 COVID-19 patients). Among contacts, household members had the highest…
January 25, 2021
Antigen-Based Testing but Not Real-Time Polymerase Chain Reaction Correlates With Severe Acute Respiratory Syndrome Coronavirus 2 Viral Culture
Antigen testing using the BD Veritor System for SARS-CoV-2 demonstrated a higher positive predictive value (90%) than rt-PCR (70%) with the Quidel Lyra SARS-CoV-2 Assay when compared to virus culture as the gold standard. The positive percentage agreement for detection of infectious virus for the antigen test was similar to rt-PCR when compared to culture…
Epidemiological Investigation of a COVID-19 Family Cluster Outbreak Transmitted by a 3-Month-Old Infant
Investigation of a SARS-CoV-2 family cluster outbreak in Wuhan, China transmitted by a 3-month-old infant showed an attack rate of 80% (4/5 family members), and fecal tests for SARS-CoV-2 RNA remained positive for 27 days after the infant was discharged from the hospital. The infant was suspected to have been infected while at a swimming…
Seroprevalence and Seroconversions for SARS-CoV-2 Infections in Workers at Bogota Airport, Colombia 2020
A study of workers (n=212) at the Bogata, Colombia airport conducted between June 1 and September 30, 2020 found that the cumulative incidence and seroprevalence of SARS-CoV-2 among workers was 23.6% and 16.0%, respectively. Most cases were asymptomatic (84%), and 61% of participants seroconverted during the study period, with no significant differences in seroconversion between…
Prevalence of SARS-CoV-2 Infection in Children and Their Parents in Southwest Germany
A multicenter, cross-sectional study of SARS-CoV-2 seroprevalence among children aged 1-10 years (n=2,482) in Germany and a corresponding parent (n=2,482) found that between April 22 and May 15 2020, the estimated seroprevalence was low in parents (1.8%) and 3-fold lower in children (0.6%). Only two participants (0.04%) tested positive for SARS-CoV-2 RNA. Among 56 families…
January 22, 2021
A Cross-Sectional Analysis of Demographic and Behavioral Risk Factors of SARS-CoV-2 Antibody Positivity among a Sample of U.S. College Students
[pre-print, not peer-reviewed] Among undergraduate students at a single college in Indiana, fraternity or sorority membership, having multiple romantic partners, knowing someone with COVID-19, drinking alcohol more than 1 day per week, and attending social gatherings with more than 4 people when drinking alcohol increased both the likelihood of seropositivity and self-reported history of SARS-CoV-2….
January 21, 2021
Genomic Epidemiology of SARS-CoV-2 Reveals Multiple Lineages and Early Spread of SARS-CoV-2 Infections in Lombardy, Italy
Sequence analysis of 346 whole SARS-CoV-2 genomes collected from Italy suggest that up to 7 viral lineages were circulating in the country between February and April 2020. Two lineages likely originated from Italy, including the B.1 lineage that is hypothesized to have given rise to variants emerging from the UK and South Africa. Local transmission…
The Association of COVID-19 Incidence with Sport and Face Mask Use in United States High School Athletes
[pre-print, not peer reviewed] A nationwide survey of 152,484 high school athletes found cumulative incidence of 1,682 COVID-19 cases per 100,000 athletes, corresponding to an incidence rate of 24.6 cases per 100,000 player-days between August and October 2020. Incidence was lower when sports were outdoors and non-contact but no differences were detected between team versus…
January 20, 2021
Mask-Wearing and Control of SARS-CoV-2 Transmission in the USA: A Cross-Sectional Study
A cross-sectional survey study (n =378,207 participants) of mask-wearing and physical distancing in the US found that a 10% increase in self-reported mask-wearing was associated with an increased odds of transmission control at the community level (OR=3.53). Communities with high reported mask-wearing and physical distancing had the highest predicted probability of transmission control. Segmented regression…
January 19, 2021
Secondary Attack Rate in Household Contacts of COVID-19 Paediatric Index Cases: A Study from Western India
A cross-sectional study in Western India estimated a SARS-CoV-2 household attack rate from pediatric index cases of 2%, based on 72 pediatric index COVID-19 cases and 287 household contacts. Index cases were mostly male (94%) and between the ages of 12-18 (74%). Households of index cases with secondary infections were larger than those without secondary…
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