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Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
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Microbial cooperation involves beneficial interactions in which different species work together for individual or mutual advantage. These interactions can profoundly influence ecological dynamics and evolutionary processes, and they are essential to many pathogenic and symbiotic relationships.Nematode–Bacteria CooperationA striking example is the relationship between the Gram-negative bacterium Xenorhabdus nematophila and the parasitic nematode Steinernema carpocapsae. Juvenile nematodes...
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Related Experiment Video

Updated: Apr 15, 2026

Quantifying Human Norovirus Virus-like Particles Binding to Commensal Bacteria Using Flow Cytometry
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Interactions between Human Norovirus Surrogates and Acanthamoeba spp.

Tun-Yun Hsueh1, Kristen E Gibson2

  • 1Department of Food Science, Center for Food Safety, Division of Agriculture, University of Arkansas, Fayetteville, Arkansas, USA.

Applied and Environmental Microbiology
|April 5, 2015
PubMed
Summary

Free-living amoebae may act as reservoirs for human noroviruses (HuNoVs), facilitating their environmental spread. Infectious HuNoV surrogates were found within amoebae even after their life cycle, suggesting a role in virus persistence.

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Area of Science:

  • Environmental microbiology
  • Virology
  • Public health

Background:

  • Human noroviruses (HuNoVs) are a leading cause of foodborne and waterborne illness outbreaks in the US.
  • Free-living amoebae (FLA) are common environmental microorganisms found in water and produce, known to interact with pathogens.

Purpose of the Study:

  • To investigate the potential of FLA as reservoirs for HuNoV.
  • To understand the interaction between Acanthamoeba species and HuNoV surrogates (MNV-1, FCV).

Main Methods:

  • Incubation of Acanthamoeba castellanii and A. polyphaga with MNV-1 and FCV.
  • Quantification of infectious virus recovery over time.
  • Immunofluorescence microscopy to determine virus location within amoebae.

Main Results:

  • Acanthamoeba species efficiently recovered infectious murine norovirus type 1 (MNV-1), but not feline calicivirus (FCV).
  • MNV-1 remained stable and infectious within A. castellanii for up to 8 days, persisting through the amoebal life cycle.
  • Immunofluorescence confirmed MNV-1 entry into and presence within Acanthamoeba over 24 hours.

Conclusions:

  • FLA, specifically Acanthamoeba, can serve as reservoirs for HuNoV surrogates.
  • Amoebal interaction aids in the environmental persistence and potential transmission of HuNoVs.
  • Findings highlight a novel pathway for HuNoV survival in water and contamination of fresh produce.