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    Anthrax bacteria, illustration. Anthrax bacteria (Bacillus anthracis) are the cause of the disease anthrax in humans and livestock. They are gram-positive spore producing bacteria arranged in chains (streptobacilli). Many cells have a central spore. — Stock Photo
    Anthrax bacteria, illustration. Anthrax bacteria (Bacillus anthracis) are the cause of the disease anthrax in humans and livestock. They are gram-positive spore producing bacteria arranged in chains (streptobacilli). Many cells have a central spore.
    Abstract group of particles of viruses, computer illustration. — Stock Photo
    Abstract group of particles of viruses, computer illustration.
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Relation of thyroid and pituitary gland — Stock Photo
    Relation of thyroid and pituitary gland
    Cancer cell and T cells — Stock Photo
    Cancer cell and T cells
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Digital illustration of trypanosome parasite in blood causing Chagas disease. — Stock Photo
    Digital illustration of trypanosome parasite in blood causing Chagas disease.
    Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines — Stock Photo
    Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines
    Bacterial encephalitis. Conceptual computer illustration showing bacteria infecting brain cells — Stock Photo
    Bacterial encephalitis. Conceptual computer illustration showing bacteria infecting brain cells
    Normal human red blood cell — Stock Photo
    Normal human red blood cell
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Red blood cells in blood vessel, digital illustration. — Stock Photo
    Red blood cells in blood vessel, digital illustration.
    Coloured scanning electron micrograph of cancer cells migrating down pores. — Stock Photo
    Coloured scanning electron micrograph of cancer cells migrating down pores.
    Closeup of needle of syringe filled with vaccine from virus injected in cell on blurred background — Stock Photo
    Closeup of needle of syringe filled with vaccine from virus injected in cell on blurred background
    Scientist examining cultured cells under microscope. — Stock Photo
    Scientist examining cultured cells under microscope.
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Conceptual illustration showing virus infecting neurons of brain. — Stock Photo
    Conceptual illustration showing virus infecting neurons of brain.
    Fat cells, computer illustration — Stock Photo
    Fat cells, computer illustration
    Colored digital illustration of red cancer cells. — Stock Photo
    Colored digital illustration of red cancer cells.
    Blood clot formed by red blood cells — Stock Photo
    Blood clot formed by red blood cells
    Red blood cells — Stock Photo
    Red blood cells
    Donor blood in blood bags, close-up. — Stock Photo
    Donor blood in blood bags, close-up.
    Pyoderma skin disease — Stock Photo
    Pyoderma skin disease
    Activated macrophage attacking bacteria — Stock Photo
    Activated macrophage attacking bacteria
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration. — Stock Photo
    Blood cells and Plasmodium sp. parasites (at schizont stage) causing malaria, computer illustration.
    Campylobacter jejuni bacteria with flagella, digital artwork. — Stock Photo
    Campylobacter jejuni bacteria with flagella, digital artwork.
    Medical illustration of adrenal gland anatomy on white background — Stock Photo
    Medical illustration of adrenal gland anatomy on white background
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration. — Stock Photo
    Plasmodium ovale protozoan parasite and red blood cell in flow, computer illustration.
    Bottlebrush pollen grain — Stock Photo
    Bottlebrush pollen grain
    Axon connections between cells — Stock Photo
    Axon connections between cells
    Blood clot, computer illustration — Stock Photo
    Blood clot, computer illustration
    Grey matter of the cerebellum — Stock Photo
    Grey matter of the cerebellum
    Used surgical swab — Stock Photo
    Used surgical swab
    Entamoeba gingivalis parasitic pathogen single-celled protozoans, amoebas in oral cavity, digital illustration. — Stock Photo
    Entamoeba gingivalis parasitic pathogen single-celled protozoans, amoebas in oral cavity, digital illustration.
    Illustration of Klebsiella pneumoniae bacteria. K. pneumoniae are Gram-negative, encapsulated, non-motile, enteric, rod-shaped bacteria. This species causes Friedlander's pneumonia and urinary tract infections — Stock Photo
    Illustration of Klebsiella pneumoniae bacteria. K. pneumoniae are Gram-negative, encapsulated, non-motile, enteric, rod-shaped bacteria. This species causes Friedlander's pneumonia and urinary tract infections
    Sporozoite malaria pathogens, digital illustration. — Stock Photo
    Sporozoite malaria pathogens, digital illustration.
    Digital illustration of Neisseria gonorrhoeae bacteria inside neutrophil white blood cells. — Stock Photo
    Digital illustration of Neisseria gonorrhoeae bacteria inside neutrophil white blood cells.
    Cell membrane structure, digital illustration. — Stock Photo
    Cell membrane structure, digital illustration.
    Closeup of abstract background with round shaped cells of vaccine of different sizes illuminated by colorful light — Stock Photo
    Closeup of abstract background with round shaped cells of vaccine of different sizes illuminated by colorful light
    Digital illustration of shaped virus cells. — Stock Photo
    Digital illustration of shaped virus cells.
    Closeup of Amoeba, computer illustration — Stock Photo
    Closeup of Amoeba, computer illustration
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system. — Stock Photo
    Panoramic illustration of blood vessel with eosinophilia with numerous eosinophils white blood cells, anti-parasite immune system.
    Female scientist holding tray for stem cell research. — Stock Photo
    Female scientist holding tray for stem cell research.
    Flu viruses, computer illustration — Stock Photo
    Flu viruses, computer illustration
    Abstract 3d illustration of nerve cells with connections in human nervous system. — Stock Photo
    Abstract 3d illustration of nerve cells with connections in human nervous system.
    Eosinophilia blood smear with numerous eosinophils, digital illustration. — Stock Photo
    Eosinophilia blood smear with numerous eosinophils, digital illustration.
    Illustration of illuminated cancer cells on black background. — Stock Photo
    Illustration of illuminated cancer cells on black background.
    Red blood cells in blood stream — Stock Photo
    Red blood cells in blood stream
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Female reproductive system and Gardnerella vaginalis bacteria attached to vaginal epithelial cells causing bacterial vaginosis, digital illustration. — Stock Photo
    Female reproductive system and Gardnerella vaginalis bacteria attached to vaginal epithelial cells causing bacterial vaginosis, digital illustration.
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Polio virus particles, digital illustration. — Stock Photo
    Polio virus particles, digital illustration.
    Fallopian tube cellular structure — Stock Photo
    Fallopian tube cellular structure
    Intestinal villi projections — Stock Photo
    Intestinal villi projections
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung — Stock Photo
    Lung bronchiole. Light micrograph of a section through lung tissue and a bronchiole. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching into bronchioles within the lung
    3d illustration of cells pattern with red cell. — Stock Photo
    3d illustration of cells pattern with red cell.
    Conceptual digital illustration of human blastocyst on needle tip. — Stock Photo
    Conceptual digital illustration of human blastocyst on needle tip.
    Skin cancer cell, computer illustration. — Stock Photo
    Skin cancer cell, computer illustration.
    Anatomy of the structure and layers of the stomach wall — Stock Photo
    Anatomy of the structure and layers of the stomach wall