552 research outputs found
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The secret life of coronavirus: Why we need such drastic social distancing measures
Integrative Biolog
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Estimated COVID-19 Mortality in China, December 16, 2022-January 19, 2023
The recent wave of COVID-19 in China peaked in late December of 2022, with 0.07 million deaths confirmed in hospitals between December 16, 2022 and January 19, 2023.Integrative Biolog
Mathematical Approaches to Infectious Disease Prediction and Control
Mathematics has long been an important tool for understanding and controlling the spread of infectious diseases. Here, we begin with an overview of compartmental models, the traditional approach to modeling infectious disease dynamics, and then introduce contact network epidemi- ology, a relatively new approach that applies bond percolation on random graphs to model the spread of infectious disease through heterogeneous populations. As we illustrate, these methods can be used to address public health challenges and have recently been coupled with powerful computational methods to optimize epidemic control strategies
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The Experience of Two Independent Schools with In-Person Learning During the COVID-19 Pandemic
Background: In 2020, U.S schools closed due to SARS-CoV-2 but their role in transmission was
unknown. In fall 2020, national guidance for reopening omitted testing or screening
recommendations. We report the experience of 2 large independent K-12 schools (School-A and
School-B) that implemented an array of SARS-CoV-2 mitigation strategies that included
periodic universal testing. Methods: SARS-CoV-2 was identified through periodic universal PCR testing, self-reporting of
tests conducted outside school, and contact tracing. Schools implemented behavioral and
structural mitigation measures, including mandatory masks, classroom disinfecting, and social
distancing. Results: Over the fall semester, School-A identified 112 cases in 2320 students and staff; School-
B identified 25 cases (2.0%) in 1200 students and staff. Most cases were asymptomatic and none
required hospitalization. Of 69 traceable introductions, 63(91%) were not associated with
school-based transmission, 59 cases (54%) occurred in the 2 weeks post-Thanksgiving. In 6/7
clusters, clear noncompliance with mitigation protocols was found. The largest outbreak had 28
identified cases and was traced to an off-campus party. There was no transmission from students
to staff. Conclusions: Although school-age children can contract and transmit SARS-CoV-2, rates of COVID-
19 infection related to in-person education were significantly lower than those in the surrounding community. However, social activities among students outside of school undermined those
measures and should be discouraged, perhaps with behavioral contracts, to ensure the safety of
school communities. In addition, introduction risks were highest following extended school
breaks. These risks may be mitigated with voluntary quarantines and surveillance testing prior to
re-opening.Integrative Biolog
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