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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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Related Experiment Video

Updated: May 23, 2026

Inoculating Anopheles gambiae Mosquitoes with Beads to Induce and Measure the Melanization Immune Response
08:24

Inoculating Anopheles gambiae Mosquitoes with Beads to Induce and Measure the Melanization Immune Response

Published on: January 12, 2017

Ecological context influences epidemic size and parasite-driven evolution.

Meghan A Duffy1, Jessica Housley Ochs, Rachel M Penczykowski

  • 1School of Biology, Georgia Institute of Technology, Atlanta, GA 30332-0230, USA. duffy@gatech.edu

Science (New York, N.Y.)
|March 31, 2012
PubMed
Summary

Ecological context shapes host evolution during disease outbreaks. Hosts evolved resistance during large epidemics and susceptibility during small ones, influenced by factors like productivity and predation.

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Oral Bacterial Infection and Shedding in Drosophila melanogaster
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Oral Bacterial Infection and Shedding in Drosophila melanogaster
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Published on: May 31, 2018

Area of Science:

  • Evolutionary biology
  • Ecology
  • Epidemiology

Background:

  • Disease outbreaks significantly impact host evolution.
  • A resistance-fecundity trade-off can lead to hosts evolving different resistance levels based on epidemic size.

Purpose of the Study:

  • To test the prediction that host evolution, specifically resistance to infection, varies with epidemic magnitude.
  • To investigate the role of ecological factors in determining epidemic size and subsequent host evolutionary responses.

Main Methods:

  • Utilized a zooplankton-yeast host-parasite system to study host evolution.
  • Manipulated ecological factors (productivity and predation) to alter yeast epidemic sizes in different lake environments.

Main Results:

  • High productivity and low predation led to large yeast epidemics and increased host resistance.
  • Low productivity and high predation resulted in small epidemics and increased host susceptibility.

Conclusions:

  • Ecological context, specifically productivity and predation, directly shapes host evolution during epidemics.
  • Anthropogenic changes to these ecological factors may have profound impacts on both ecological dynamics and evolutionary trajectories of diseases.