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Nematoda worm under a microscope, family Enoplidae, possibly Enoplus sp. White Sea

Cute dog and illustration of helminths under microscope on white background. Parasites in animal

Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides for education in laboratories.

Study of Parasitic helminths (Trematodes) and Ascaris of fishes under a microscope.

Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides for education in laboratories.

The nematodes (Nematoda), roundworms or eelworms constitute the phylum Nematoda. Species in the phylum inhabit a broad range of environments. Found in freshwater crabs.

The nematodes (Nematoda), roundworms or eelworms constitute the phylum Nematoda. Species in the phylum inhabit a broad range of environments. Found in freshwater crabs.

A bunch of dog roundworms, or Toxocara canis, ejected on the grass from a puppy's vomit. Pet health and deworming concept

The nematodes (Nematoda), roundworms or eelworms constitute the phylum Nematoda. Species in the phylum inhabit a broad range of environments. Found in freshwater crabs.

Toxocara canis second stage larvae hatch from eggs

Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides for education in laboratories.

Nematode roundworm stained under the phase contrast microscope

A single dog roundworm, or Toxocara canis, on the grass crawling away from a puppy's vomit. Pet health and deworming concept.

Ascaris lumbricoides, a dead roundworm, was found in chickens

Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides for education in laboratories.

Helminthiasis Toxocara canis (also known as dog roundworm) or parasitic worms from little dog on white background, Pet health care concept

Close-up photo of Toxocara cati. Roundworms from a cat

Microscopic view collage of free-living form male and female Strongyloides stercoralis in human stool, a pathogenic parasitic threadworm causing the disease strongyloidiasis.

Nypostrongylus worm preparations in rat feces taken by sediment method, hematology

Raccoon feces in Kansas containing undigested seeds and, most likely, millions of eggs from roundworms or other parasites. Rock and dried leaf litter background.

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