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Related Concept Videos

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...
Reservoir of Infection01:30

Reservoir of Infection

Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
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...
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...
Causality in Epidemiology01:21

Causality in Epidemiology

Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...

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Related Experiment Video

Updated: Jun 23, 2026

Oral Bacterial Infection and Shedding in Drosophila melanogaster
09:32

Oral Bacterial Infection and Shedding in Drosophila melanogaster

Published on: May 31, 2018

Host-pathogen time series data in wildlife support a transmission function between density and frequency dependence.

Matthew J Smith1, Sandra Telfer, Eva R Kallio

  • 1Computational Ecology and Environmental Science Group, Microsoft Research, 7 J J Thompson Avenue, Cambridge CB3 0FB, United Kingdom. matthew.smith@microsoft.com

Proceedings of the National Academy of Sciences of the United States of America
|May 7, 2009
PubMed
Summary

Understanding pathogen spread requires analyzing transmission dynamics. This study reveals infection rates saturate with host density and vary seasonally, improving epidemiological models.

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Area of Science:

  • Epidemiology
  • Mathematical Biology
  • Ecology

Background:

  • Understanding how pathogens spread is crucial in epidemiology.
  • Mathematical models often assume density-dependent or frequency-dependent transmission, but empirical validation is limited.
  • Cowpox virus in natural populations provides a model for studying zoonotic pathogen transmission.

Purpose of the Study:

  • To investigate transmission functions of pathogens in natural populations.
  • To determine the relationship between host density and host contact rate.
  • To assess the role of seasonality and loss terms in disease dynamics.

Main Methods:

  • Fitting infection equations to six years of cowpox virus data from four natural populations.
  • Utilizing a reformulated transmission equation for easier estimation of density-host contact rate relationships.
  • Analyzing time series data, including susceptible individuals, to fit mechanistic disease models.

Main Results:

  • Infection rate is a saturating function of host density, not strictly density- or frequency-dependent.
  • Strong evidence for seasonality in transmission coefficient and host contact rate, linked to social behavior and susceptibility.
  • Accurate identification of the loss term is critical for inferring transmission mechanisms.

Conclusions:

  • Pathogen transmission dynamics are complex, often exhibiting saturating density dependence and seasonality.
  • Mechanistic disease models can be effectively fitted using time series data, particularly on susceptible populations.
  • This study advances the understanding of zoonotic pathogen spread and informs epidemiological modeling.