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    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    3d illustration of intestinal villi and stomach ulcer. — Stock Photo
    3d illustration of intestinal villi and stomach ulcer.
    Human body model showing female anatomy with internal organs, digital 3d render illustration. — Stock Photo
    Human body model showing female anatomy with internal organs, digital 3d render illustration.
    Illustration of small intestine in human body silhouette. — Stock Photo
    Illustration of small intestine in human body silhouette.
    Human skeletal system and internal organs — Stock Photo
    Human skeletal system and internal organs
    Female silhouette with visible small intestine, digital illustration. — Stock Photo
    Female silhouette with visible small intestine, digital illustration.
    Illustration of senior man silhouette with visible colon. — Stock Photo
    Illustration of senior man silhouette with visible colon.
    Organs and body systems of adult female — Stock Photo
    Organs and body systems of adult female
    Colored small intestine in female body silhouette, computer illustration. — Stock Photo
    Colored small intestine in female body silhouette, computer illustration.
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Female body with diseased colon, digital illustration. — Stock Photo
    Female body with diseased colon, digital illustration.
    Gallbladder in abstract female body on blue background, computer illustration. — Stock Photo
    Gallbladder in abstract female body on blue background, computer illustration.
    Transparent body model showing male anatomy and internal organs, digital illustration. — Stock Photo
    Transparent body model showing male anatomy and internal organs, digital illustration.
    Male upper body anatomy and internal organs in low angle view, computer illustration. — Stock Photo
    Male upper body anatomy and internal organs in low angle view, computer illustration.
    Newborn digestive and cardio-vascular systems — Stock Photo
    Newborn digestive and cardio-vascular systems
    Roundworm in the intestines — Stock Photo
    Roundworm in the intestines
    Skeletal and muscular systems — Stock Photo
    Skeletal and muscular systems
    Illustration of human organs on white background. — Stock Photo
    Illustration of human organs on white background.
    Digital illustration of threadworm in human intestine. — Stock Photo
    Digital illustration of threadworm in human intestine.
    3d rendered illustration of colored female small intestine in body silhouette. — Stock Photo
    3d rendered illustration of colored female small intestine in body silhouette.
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Large intestine on white background, digital illustration. — Stock Photo
    Large intestine on white background, digital illustration.
    Lactobacillus bacteria in human small intestine microbiome, digital illustration. — Stock Photo
    Lactobacillus bacteria in human small intestine microbiome, digital illustration.
    Human body anatomy with highlighted digestive system, digital illustration. — Stock Photo
    Human body anatomy with highlighted digestive system, digital illustration.
    Digital illustration of multiple threadworms in human intestine. — Stock Photo
    Digital illustration of multiple threadworms in human intestine.
    Computer illustration showing a female torso with the internal organs, side view. — Stock Photo
    Computer illustration showing a female torso with the internal organs, side view.
    Small intestine and bowel cancer in female body, conceptual computer illustration. — Stock Photo
    Small intestine and bowel cancer in female body, conceptual computer illustration.
    Illustration of red and inflamed human appendix and close-up of bacteria causative agents of appendicitis. — Stock Photo
    Illustration of red and inflamed human appendix and close-up of bacteria causative agents of appendicitis.
    Female abdominal organs, midsection, digital illustration. — Stock Photo
    Female abdominal organs, midsection, digital illustration.
    Digital illustration of Helicobacter pylori bacteria in human stomach. — Stock Photo
    Digital illustration of Helicobacter pylori bacteria in human stomach.
    Intestinal lining anatomy — Stock Photo
    Intestinal lining anatomy
    Giardia lamblia single-celled protozoan parasite in human duodenum, digital artwork. — Stock Photo
    Giardia lamblia single-celled protozoan parasite in human duodenum, digital artwork.
    Cryptosporidium parvum parasite in human body causing cryptosporidiosis, digital illustration. — Stock Photo
    Cryptosporidium parvum parasite in human body causing cryptosporidiosis, digital illustration.
    3d anatomical model showing internal organs in female anatomy, computer illustration. — Stock Photo
    3d anatomical model showing internal organs in female anatomy, computer illustration.
    Female body with diseased colon, digital illustration. — Stock Photo
    Female body with diseased colon, digital illustration.
    Diseased gallbladder in abstract human body, conceptual digital illustration. — Stock Photo
    Diseased gallbladder in abstract human body, conceptual digital illustration.
    Frontal illustration of blue silhouette of obese woman with highlighted small intestine on black background. — Stock Photo
    Frontal illustration of blue silhouette of obese woman with highlighted small intestine on black background.
    Giardia lamblia single-celled protozoan parasites in human duodenum, digital artwork. — Stock Photo
    Giardia lamblia single-celled protozoan parasites in human duodenum, digital artwork.
    Illustration of female silhouette with highlighted small intestine. — Stock Photo
    Illustration of female silhouette with highlighted small intestine.
    Male abdominal organs, midsection, digital illustration. — Stock Photo
    Male abdominal organs, midsection, digital illustration.
    Illustration of senior man silhouette with visible colon. — Stock Photo
    Illustration of senior man silhouette with visible colon.
    Illustration of human silhouette with inflamed small intestine. — Stock Photo
    Illustration of human silhouette with inflamed small intestine.
    Female abdominal organs, midsection, digital illustration. — Stock Photo
    Female abdominal organs, midsection, digital illustration.
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract. — Stock Photo
    Digital illustration of ciliate protozoan Balantidium coli intestinal parasites causing ulcer in intestinal tract.
    Illustration of human silhouette with painful digestive system. — Stock Photo
    Illustration of human silhouette with painful digestive system.
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    Round worms in human intestine, computer illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species — Stock Photo
    Round worms in human intestine, computer illustration. Roundworms, or nematodes, include numerous free-living and pathogenic species
    Male body with diseased colon, computer illustration. — Stock Photo
    Male body with diseased colon, computer illustration.
    Healthy state of large intestines — Stock Photo
    Healthy state of large intestines
    Illustration of female silhouette with highlighted colon. — Stock Photo
    Illustration of female silhouette with highlighted colon.
    Illustration of senior woman silhouette with colored colon on black background. — Stock Photo
    Illustration of senior woman silhouette with colored colon on black background.
    Human body model showing female anatomy with internal organs in rear view, digital 3d render illustration. — Stock Photo
    Human body model showing female anatomy with internal organs in rear view, digital 3d render illustration.
    View of Human anatomy — Stock Photo
    View of Human anatomy
    Illustration of colon in silhouette of female body. — Stock Photo
    Illustration of colon in silhouette of female body.
    Female abdominal organs, midsection, digital illustration. — Stock Photo
    Female abdominal organs, midsection, digital illustration.
    Digital illustration showing bacteria causing infections of respiratory and digestive system, Mycobacterium tuberculosis, Helicobacter pylori, Hepatitis B, Salmonella. — Stock Photo
    Digital illustration showing bacteria causing infections of respiratory and digestive system, Mycobacterium tuberculosis, Helicobacter pylori, Hepatitis B, Salmonella.
    Male upper body anatomy and internal organs, computer illustration. — Stock Photo
    Male upper body anatomy and internal organs, computer illustration.
    Illustration of colon in transparent male silhouette. — Stock Photo
    Illustration of colon in transparent male silhouette.
    Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food — Stock Photo
    Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food
    Coloured frontal X-ray of a blocked intestine (upper centre). — Stock Photo
    Coloured frontal X-ray of a blocked intestine (upper centre).