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Related Concept Videos

Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...
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Infection01:20

Infection

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Relationship Formation02:12

Relationship Formation

What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...
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Transmission-based Precautions II: Airborne and Protective Environment

Transmission-based precautions are for patients infected or suspected to be infected (or colonized) with organisms posing a significant risk to others. The transmission precautions include airborne and protective environment precautions.
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Related Experiment Video

Updated: May 21, 2026

Contact-Free Co-Culture Model for the Study of Innate Immune Cell Activation During Respiratory Virus Infection
07:36

Contact-Free Co-Culture Model for the Study of Innate Immune Cell Activation During Respiratory Virus Infection

Published on: February 28, 2021

Transmission Dominance Under Random-Contact Intensification in Epidemic Networks: Multilayer Contact Network

Mingxuan Zhang1, Tomohide Maekawa2, Kaira Sekiguchi3

  • 1Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Bunkyo-ku, Tokyo, 113-0033, Japan, 81 3-5841-6533.

JMIR Formative Research
|May 20, 2026
PubMed
Summary
This summary is machine-generated.

Increasing incidental encounters in urban networks can shift COVID-19 transmission drivers from high-contact to medium-contact groups. This highlights how social contact patterns influence epidemic dynamics and intervention strategies.

Keywords:
COVID-19SEIRSusceptible-Exposed-Infectious-Removedagent-based simulationcontact networksdigital epidemiologyepidemic modelingmultilayer networkspublic health informaticsrandom contactstransmission heterogeneity

Related Experiment Videos

Last Updated: May 21, 2026

Contact-Free Co-Culture Model for the Study of Innate Immune Cell Activation During Respiratory Virus Infection
07:36

Contact-Free Co-Culture Model for the Study of Innate Immune Cell Activation During Respiratory Virus Infection

Published on: February 28, 2021

Area of Science:

  • Epidemiology
  • Network Science
  • Public Health

Background:

  • COVID-19 transmission via human contact networks poses public health challenges.
  • Understanding transmission contributors under varying social conditions is crucial.
  • The role of incidental encounters in multilayer urban networks remains unclear.

Purpose of the Study:

  • To investigate how changing overall contact opportunities affects epidemic spread.
  • To determine if increasing incidental encounters shifts transmission contributors.
  • To identify the underlying network mechanisms driving these shifts.

Main Methods:

  • A synthetic multilayer urban contact network was constructed.
  • A Susceptible-Exposed-Infectious-Removed (SEIR) model simulated transmission.
  • Individuals were categorized into high- and medium-contact groups.
  • Contact parameters were calibrated using survey data from Tokyo and Kanagawa.

Main Results:

  • Increased overall contact opportunities led to higher and earlier epidemic peaks.
  • Fixed routine contacts and increased incidental encounters shifted transmission dominance from high- to medium-contact individuals.
  • A bridge-allocation mechanism involving incidental contacts was identified.

Conclusions:

  • Incidental encounters can alter transmission contributors in urban networks, independent of routine contacts.
  • An analysis framework was developed to identify shifts in transmission contributors.
  • Findings support comparing intervention priorities across different social contact scenarios.