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Related Concept Videos

Infection01:20

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
Steps in Outbreak Investigation01:18

Steps in Outbreak Investigation

In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
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...
Transmission of Pathogens01:24

Transmission of Pathogens

Pathogens spread from their reservoirs to susceptible hosts through three main routes: contact transmission, vehicle transmission, and vector transmission. Each route involves distinct mechanisms of transfer.Contact TransmissionThis category includes direct contact, indirect contact, and droplet transmission:Direct contact involves immediate physical interaction between individuals—such as a handshake—which can spread pathogens like Streptococcus pyogenes, the bacterium responsible for...
Investigation of Disease Outbreaks01:23

Investigation of Disease Outbreaks

Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...

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Related Experiment Video

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Experimental Viral Infection in Adult Mosquitoes by Oral Feeding and Microinjection
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Quantifying viral pandemic potential from experimental transmission studies.

Elizabeth D Somsen1, Kayla M Septer2, Cassandra J Field2

  • 1Graduate Program in Population Biology, Ecology, and Evolution, Emory University, Atlanta, Georgia, United States of America.

Plos Computational Biology
|December 17, 2025
PubMed
Summary

This study introduces a new framework to assess pandemic risk by analyzing viral transmission data from animal models. The findings indicate that the California/2009 influenza A virus poses a higher pandemic threat than the Hong Kong/1968 strain.

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Area of Science:

  • * Epidemiology and Virology
  • * Infectious Disease Modeling
  • * Pandemic Preparedness

Background:

  • * Global surveillance identifies diverse animal viruses with pandemic potential.
  • * Current tools for assessing viral pandemic risk are limited and provide low-resolution outcomes.
  • * Experimental transmission studies in animal models lack direct translation to population-level dynamics.

Purpose of the Study:

  • * To develop an analytical framework for quantitative pandemic risk assessment.
  • * To extend the utility of experimental transmission data for risk evaluation.
  • * To compare the pandemic potential of two specific influenza A virus strains.

Main Methods:

  • * Development of an analytical framework using within-host viral titer data from index and contact animals.
  • * Estimation of individual-level transmission parameters and epidemiological parameters (e.g., reproduction numbers, generation intervals).
  • * Application of the framework to two influenza A virus (IAV) ferret transmission experiments (Cal/2009 and Hong Kong/1968).

Main Results:

  • * The analytical framework provides more quantitative risk assessments than traditional methods.
  • * Influenza A/California/07/2009 demonstrated higher pandemic potential compared to Influenza A/Hong Kong/1/1968 in head-to-head comparison.
  • * Estimated epidemiological parameters like reproduction numbers and generation intervals for the tested IAV strains.

Conclusions:

  • * The proposed analytical framework enhances the relative risk assessment of emerging viruses.
  • * The findings suggest Cal/2009 has a greater pandemic potential than Hong Kong/1968.
  • * This methodology can be applied to improve the assessment of other viruses of pandemic concern.