We used multi-agent simulations to estimate the testing capacity required to find and isolate a number of infections sufficient to break the chain of transmission of SARS-CoV-2. Depending on the mitigation policies in place, a daily capacity between 0.7 to 3.6 tests per thousand was required to contain the disease. However, if contact tracing and testing efficacy dropped below 60% (e.g. due to false negatives or reduced tracing capability), the number of infections kept growing exponentially, irrespective of any testing capacity. Under these conditions, the population's geographical distribution and travel behaviour could inform sampling policies to aid a successful containment.
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http://dx.doi.org/10.1101/2020.06.05.20123372 | DOI Listing |
PLoS One
January 2025
COVID-19 Response Team, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America.
Households are a significant source of SARS-CoV-2 transmission, even during periods of low community-level spread. Comparing household transmission rates by SARS-CoV-2 variant may provide relevant information about current risks and prevention strategies. This investigation aimed to estimate differences in household transmission risk comparing the SARS-CoV-2 Delta and Omicron variants using data from contact tracing and interviews conducted from November 2021 through February 2022 in five U.
View Article and Find Full Text PDFSex Health
January 2025
Burnet Institute, Melbourne, Vic, Australia; and Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Vic, Australia; and Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Vic, Australia.
Background Partner notification is an important step in the control of sexually transmissible infections (STIs). STIs remain at high rates among young people and can have serious reproductive consequences if left untreated. This study aimed to determine the preferences and motivations for partner notification among young people in Australia.
View Article and Find Full Text PDFSao Paulo Med J
January 2025
Adjunt Professor, College of Medicine, Universidade Federal do Vale do São Francisco (UNIVASF), Paulo Afonso (BA), Brazil.
Background: The diagnosis and treatment of latent tuberculosis infection (LTBI) are crucial for tuberculosis (TB) control. Household contacts (HHC) of patients with pulmonary TB are at a high risk of LTBI due to their close proximity to source cases.
Objective: To describe the diagnosis and treatment of LTBI among HHC.
Disaster Med Public Health Prep
January 2025
Department of Environmental Health, Yale University School of Public Health, New Haven, CT, USA.
Objectives: During the COVID-19 pandemic, free on-demand testing was promoted in the US. This study was undertaken to support or refute the hypothesis that negative SARS-CoV-2 tests led to travel that exposed travelers to the virus in US states.
Methods: Data on daily trips outside households based on cell phone movement were matched by date to negative tests, positive tests, subsequent COVID-19 cases, and deaths lagged at various intervals in 49 US states during the first 16 months of the pandemic.
J R Soc Interface
January 2025
IHAP, Université de Toulouse, INRAE, ENVT, Toulouse, France.
Contact tracing is commonly used to manage infectious diseases of both humans and animals. It aims to detect early and control potentially infected individuals or farms that had contact with infectious cases. Because it is very resource-intensive, contact tracing is usually performed on a pre-defined time window, based on previous knowledge of the duration of the incubation period.
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