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    Light micrograph of single-celled Amoeba engulfing protozoan Paramecium. — Stock Photo
    Light micrograph of single-celled Amoeba engulfing protozoan Paramecium.
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Echinococcus granulosus hydatid cyst, computer illustration — Stock Photo
    Echinococcus granulosus hydatid cyst, computer illustration
    House dust mites — Stock Photo
    House dust mites
    Echinococcosis multilocularis hydatid cyst, computer illustration — Stock Photo
    Echinococcosis multilocularis hydatid cyst, computer illustration
    Liver fluke Clonorchis sinensis — Stock Photo
    Liver fluke Clonorchis sinensis
    A group of Orange Cup Corals (Tubastraea coccinea) surrounded by pink corraline algae (Florideophycaee, Rhodophyta) growing under an overhang at Molokini Crater, Maui, Hawaii, United States of America — Stock Photo
    A group of Orange Cup Corals (Tubastraea coccinea) surrounded by pink corraline algae (Florideophycaee, Rhodophyta) growing under an overhang at Molokini Crater, Maui, Hawaii, United States of America
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM). — Stock Photo
    Freshwater sponge (Spongilla sp.), coloured scanning electron micrograph (SEM).
    Echinococcus granulosus hydatid cyst, computer illustration — Stock Photo
    Echinococcus granulosus hydatid cyst, computer illustration
    Differential interference contrast light micrograph of different species of fossil unicellular radiolarians (protozoa). — Stock Photo
    Differential interference contrast light micrograph of different species of fossil unicellular radiolarians (protozoa).
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum — Stock Photo
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum
    Parasitic nematode worm — Stock Photo
    Parasitic nematode worm
    Parasitic adult Ticks — Stock Photo
    Parasitic adult Ticks
    Hydatid disease in liver, cystic echinococcosis, Computer illustration — Stock Photo
    Hydatid disease in liver, cystic echinococcosis, Computer illustration
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    White-faced meadowhawk dragonflies mating on plant. — Stock Photo
    White-faced meadowhawk dragonflies mating on plant.
    Hydatid disease in liver, cystic echinococcosis, Computer illustration — Stock Photo
    Hydatid disease in liver, cystic echinococcosis, Computer illustration
    Obelia hydrozoan medusa. Light micrograph (LM) of a medusa (young polyp) from the Obelia geniculata hydroid. — Stock Photo
    Obelia hydrozoan medusa. Light micrograph (LM) of a medusa (young polyp) from the Obelia geniculata hydroid.
    Human head louse — Stock Photo
    Human head louse
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation — Stock Photo
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis — Stock Photo
    Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    Dog tapeworm head — Stock Photo
    Dog tapeworm head
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans — Stock Photo
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans
    Amazing transparent Antarctic krill with red spots among haze of cold ocean water on black background — Stock Photo
    Amazing transparent Antarctic krill with red spots among haze of cold ocean water on black background
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Human head louse on human hair — Stock Photo
    Human head louse on human hair
    Stomach infected with parasitic nematode worms — Stock Photo
    Stomach infected with parasitic nematode worms
    Stick insect foot — Stock Photo
    Stick insect foot
    Lateral view of a Cushion Star (Culcita novaeguineae) resting on a reef off Maui; Maui, Hawaii, United States of America — Stock Photo
    Lateral view of a Cushion Star (Culcita novaeguineae) resting on a reef off Maui; Maui, Hawaii, United States of America
    Cat flea head — Stock Photo
    Cat flea head
    A Black-Lipped Pearl Oyster (Pinctada margaritifera) which is now a protected species, living at Haloha Reef off Maui, Hawaii, USA. This is the animal that generates the precious pearls used in jewelry; Maui, Hawaii, United States of America — Stock Photo
    A Black-Lipped Pearl Oyster (Pinctada margaritifera) which is now a protected species, living at Haloha Reef off Maui, Hawaii, USA. This is the animal that generates the precious pearls used in jewelry; Maui, Hawaii, United States of America
    Close-up of leaf beetle eggs attached to thin branch. — Stock Photo
    Close-up of leaf beetle eggs attached to thin branch.
    Hydatid disease in liver, cystic echinococcosis, Computer illustration — Stock Photo
    Hydatid disease in liver, cystic echinococcosis, Computer illustration
    Hypselodoris maridadilus sea slugs — Stock Photo
    Hypselodoris maridadilus sea slugs
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Echinococcosis multilocularis hydatid cyst, computer illustration — Stock Photo
    Echinococcosis multilocularis hydatid cyst, computer illustration
    Parasitic head louse on human hair — Stock Photo
    Parasitic head louse on human hair
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation — Stock Photo
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation
    Naegleria brain-eating amoeba forms, digital illustration — Stock Photo
    Naegleria brain-eating amoeba forms, digital illustration
    Liver fluke Clonorchis sinensis — Stock Photo
    Liver fluke Clonorchis sinensis
    Echinococcosis multilocularis hydatid cyst, computer illustration — Stock Photo
    Echinococcosis multilocularis hydatid cyst, computer illustration
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation — Stock Photo
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation
    Hydatid disease in liver, cystic echinococcosis, Computer illustration — Stock Photo
    Hydatid disease in liver, cystic echinococcosis, Computer illustration
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration — Stock Photo
    Hydatid disease in liver caused by larvae of parasitic tapeworm Echinococcus multilocularis, computer illustration
    Live Black-Lipped Pearl Oyster (Pinctada margaritifera) living on Haloha Reef off Maui; Maui, Hawaii, United States of America — Stock Photo
    Live Black-Lipped Pearl Oyster (Pinctada margaritifera) living on Haloha Reef off Maui; Maui, Hawaii, United States of America
    A male Bullethead Parrot (Chlororus sordidus) biting into turf algae forage growing on volcanic rock substrate adjacent to Lobe Coral (Porites lobata) at Molokini Crater which is located offshore of Maui; Molokini Crater, Maui, Hawaii, United States — Stock Photo
    A male Bullethead Parrot (Chlororus sordidus) biting into turf algae forage growing on volcanic rock substrate adjacent to Lobe Coral (Porites lobata) at Molokini Crater which is located offshore of Maui; Molokini Crater, Maui, Hawaii, United States
    Dog roundworm parasite — Stock Photo
    Dog roundworm parasite
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Giardia lamblia single-celled protozoan parasites in human duodenum, digital artwork. — Stock Photo
    Giardia lamblia single-celled protozoan parasites in human duodenum, digital artwork.
    Colorful corals growing on reef — Stock Photo
    Colorful corals growing on reef
    Eggs of parasitic worm Trichuris trichiura, computer illustration — Stock Photo
    Eggs of parasitic worm Trichuris trichiura, computer illustration
    Agile Chromis (Chromis agilis) schooling over Finger Coral (Porites compressa). This underwater photograph was taken near the Captain Cook Memorial located in South Kona, the Big Island; Island of Hawaii, Hawaii, United States of America — Stock Photo
    Agile Chromis (Chromis agilis) schooling over Finger Coral (Porites compressa). This underwater photograph was taken near the Captain Cook Memorial located in South Kona, the Big Island; Island of Hawaii, Hawaii, United States of America
    House dust mites — Stock Photo
    House dust mites