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Infection01:20

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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.
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Feeding the fever: Complex host-pathogen dynamics along continuous resource gradients.

Elizabeth T Borer1, Amy E Kendig2,3, Robert D Holt4

  • 1Department of Ecology, Evolution, and Behavior University of Minnesota Saint Paul Minnesota USA.

Ecology and Evolution
|July 28, 2023
PubMed
Summary

Complex host-pathogen dynamics can arise from resource availability. Our models show nonmonotonic infection patterns, where intermediate resources can lead to higher prevalence, impacting ecological and evolutionary processes.

Keywords:
bacteriaecological theoryfungushost‐pathogeninvertebratemathematical modelmicrobenitrogennutrient metalsphosphorusplantstoichiometryvertebratevirus

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Epidemiology

Background:

  • Food provides nutrition and medicine, influencing host-pathogen interactions.
  • Nonmonotonic infection responses to host resources are observed but often considered idiosyncratic.
  • Resource gradients can drive complex dynamics in host-pathogen systems.

Purpose of the Study:

  • To provide a synthetic view of nonmonotonic infection dynamics using generalized models.
  • To demonstrate how resource-dependent processes can generate nonmonotonic infection patterns.
  • To review empirical evidence and highlight future research directions.

Main Methods:

  • Generalized existing models of resource dependence for within- and among-host infection dynamics.
  • Analyzed how resources jointly impact multiple biological processes (growth, defense, transmission, mortality, predation).
  • Reviewed empirical studies measuring resource effects on multiple rates.

Main Results:

  • Developed a generalized framework explaining nonmonotonic infection dynamics across resource gradients.
  • Demonstrated that joint impacts of resources on multiple processes can lead to nonmonotonic infection outcomes and alternative states.
  • Identified conditions under which resource dependence of multiple rates generates nonmonotonic infection patterns.

Conclusions:

  • Nonmonotonic infection dynamics are likely general phenomena in natural systems, not just idiosyncratic cases.
  • Resource availability significantly shapes host-pathogen interactions in predictable, non-linear ways.
  • The generalized framework offers opportunities for future empirical and theoretical research in host-pathogen ecology and evolution.