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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Protists are diverse eukaryotic microorganisms that lack the specialized tissues of plants and animals and the chitinous cell walls of fungi. Their early divergence within Eukarya resulted in structural, functional, and ecological diversity. They are classified into supergroups such as Archaeplastida, Excavata, Amoebozoa, Rhizaria, Alveolata, and Stramenopiles, determined through genetic analysis and structural similarities.Structural and Functional AdaptationsProtists have various adaptations...
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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Microplastics Facilitate Protozoan Pathogen Contamination in Shellfish.

Minji Kim1, Colleen A Burge2, Chelsea M Rochman3

  • 1Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.

Microorganisms
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Microplastics may increase the risk of zoonotic parasite contamination in shellfish. Studies show oysters exposed to microplastics and protozoa had higher pathogen levels, impacting public health.

Keywords:
CryptosporidiumGiardiaToxoplasmabiofilmmicrofiberoysterzoonotic parasites

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Area of Science:

  • Environmental Science
  • Microbiology
  • Public Health

Background:

  • Microplastic pollution is widespread, with particles detected in seafood.
  • Microplastics can form biofilms, potentially harboring pathogens.
  • Shellfish, like oysters, are commonly consumed raw and can host zoonotic parasites.

Purpose of the Study:

  • To investigate if microplastics can facilitate the contamination of shellfish with zoonotic protozoan parasites.
  • To assess the role of microplastics as vectors for pathogens in oysters.

Main Methods:

  • Oysters were exposed to Cryptosporidium, Giardia, and Toxoplasma (oo)cysts.
  • Oysters were exposed to protozoa alone (P treatment) or with polyester microfibers (P + M treatment).
  • Pathogen levels in oysters were quantified after exposure and depuration.

Main Results:

  • Oysters exposed to both protozoa and microfibers showed significantly higher pathogen numbers compared to those exposed to protozoa alone.
  • Microplastics appear to enhance the contamination of oysters with zoonotic protozoan pathogens.
  • This suggests microplastics can act as vectors for these parasites in shellfish.

Conclusions:

  • Microplastics can facilitate protozoan pathogen contamination in shellfish, posing a risk to public health.
  • Anthropogenic pollution, including microplastics, can have unintended consequences on infectious disease transmission in coastal ecosystems.
  • This research highlights potential risks to wildlife and human health from microplastic-associated pathogens in seafood.