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Related Concept Videos

Rocky Mountain Spotted Fever01:26

Rocky Mountain Spotted Fever

Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
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...
Correlation and Causation01:27

Correlation and Causation

Correlation and CausationStatistical tests can calculate whether there is a relationship, or correlation, between independent and dependent variables. A relationship between variables shows correlation, but it does not show cause-and-effect. A direct cause-and-effect relationship requires additional controlled experiments. If no consistent relationship exists between the variables, then there is no correlation.Correlation versus CausationIf the dependent variable increases or decreases when the...
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,...
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Related Experiment Video

Updated: Jun 24, 2026

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks
04:47

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks

Published on: December 1, 2023

Correlation between tick density and pathogen endemicity, New Hampshire.

Seth T Walk1, Guang Xu, Jason W Stull

  • 1University of Massachusetts, Amherst, Massachusetts, USA.

Emerging Infectious Diseases
|April 1, 2009
PubMed
Summary

This study found tick-borne pathogens are common in New Hampshire, especially where tick populations are high. Higher tick infection rates were linked to more human disease cases.

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Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing
07:21

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing

Published on: August 25, 2018

Related Experiment Videos

Last Updated: Jun 24, 2026

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks
04:47

A Model for Experimental Exposure of Humans to Larval Ixodes scapularis Ticks

Published on: December 1, 2023

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing
07:21

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing

Published on: August 25, 2018

Area of Science:

  • Veterinary Entomology
  • Epidemiology
  • Infectious Diseases

Background:

  • Tick-borne pathogens pose significant public health risks.
  • Understanding pathogen distribution is crucial for disease prevention.

Purpose of the Study:

  • To determine the endemicity of tick-borne pathogens in New Hampshire.
  • To investigate the relationship between tick density, pathogen prevalence, and human disease incidence.

Main Methods:

  • Surveyed adult tick vectors across New Hampshire.
  • Assessed pathogen prevalence within tick populations.
  • Correlated tick density and infection rates with human disease data.

Main Results:

  • Pathogen prevalence in ticks was higher in areas with greater tick density.
  • A correlation was observed between tick establishment and pathogen endemicity.
  • Infection rates in ticks showed a positive correlation with human disease frequency.

Conclusions:

  • Tick density is a key factor in the endemicity of tick-borne pathogens.
  • Findings suggest a link between tick populations and human health risks in New Hampshire.
  • Monitoring tick populations and pathogen prevalence is vital for public health surveillance.