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    Adult parasitic louse — Stock Photo
    Adult parasitic louse
    Transparent human body with internal organs, nervous, lymphatic and circulatory systems — Stock Photo
    Transparent human body with internal organs, nervous, lymphatic and circulatory systems
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Blood vessels of human head and neck, digital illustration. — Stock Photo
    Blood vessels of human head and neck, digital illustration.
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines). — Stock Photo
    Human heart circulatory and electrical system, 3d illustration. Cross section of the heart showing the ventricles and valves, and the electrical (conduction) system (yellow lines) and circulatory system (red and blue lines).
    Close-up of pipetting blood sample into microcentrifuge tubes. — Stock Photo
    Close-up of pipetting blood sample into microcentrifuge tubes.
    Several whole blood oranges — Stock Photo
    Several whole blood oranges
    Illustration of fat inside of human artery. — Stock Photo
    Illustration of fat inside of human artery.
    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.
    Digital illustration of mosquito sucking blood on skin. — Stock Photo
    Digital illustration of mosquito sucking blood on skin.
    Tick on human skin, computer illustration. — Stock Photo
    Tick on human skin, computer illustration.
    Mature male doctor processing donor blood in bags. — Stock Photo
    Mature male doctor processing donor blood in bags.
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoa Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Transparent female body silhouette with yellow colored spleen, digital illustration. — Stock Photo
    Transparent female body silhouette with yellow colored spleen, digital illustration.
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Syringe with spilled blood on white background. — Stock Photo
    Syringe with spilled blood on white background.
    Illustration of tick parasite crawling on human skin surface. — Stock Photo
    Illustration of tick parasite crawling on human skin surface.
    Transparent female body silhouette with yellow colored spleen, digital illustration. — Stock Photo
    Transparent female body silhouette with yellow colored spleen, digital illustration.
    Cancer cells with blood vessel formation — Stock Photo
    Cancer cells with blood vessel formation
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Lung aneurysm, light micrograph. — Stock Photo
    Lung aneurysm, light micrograph.
    Digital illustration of senior man anatomy showing heart. — Stock Photo
    Digital illustration of senior man anatomy showing heart.
    Female silhouette showing heart anatomy, computer illustration. — Stock Photo
    Female silhouette showing heart anatomy, computer illustration.
    Illustration of silhouette of obese man with visible heart. — Stock Photo
    Illustration of silhouette of obese man with visible heart.
    Male head and neck anatomy, digital illustration. — Stock Photo
    Male head and neck anatomy, digital illustration.
    Close-up of plasma bags in a crate at blood bank — Stock Photo
    Close-up of plasma bags in a crate at blood bank
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Close-up view of Pacman frog and horned frog, Indonesia — Stock Photo
    Close-up view of Pacman frog and horned frog, Indonesia
    Crop unrecognizable veterinarian measuring pulse of cat with blood oxygen meter during operation in clinic — Stock Photo
    Crop unrecognizable veterinarian measuring pulse of cat with blood oxygen meter during operation in clinic
    Parasitic louse on human head skin, digital illustration. — Stock Photo
    Parasitic louse on human head skin, digital illustration.
    Brain anatomy showing blood supply system — Stock Photo
    Brain anatomy showing blood supply system
    Young man with nosebleed looking in mirror. — Stock Photo
    Young man with nosebleed looking in mirror.
    Senior woman checking blood pressure on a monitor at home — Stock Photo
    Senior woman checking blood pressure on a monitor at home
    Stacked Petri dishes with blood samples. — Stock Photo
    Stacked Petri dishes with blood samples.
    Colored illustration of mosquito pest on skin. — Stock Photo
    Colored illustration of mosquito pest on skin.
    Alveoli structure and blood supply — Stock Photo
    Alveoli structure and blood supply
    Red sea water of Hormuz Island — Stock Photo
    Red sea water of Hormuz Island
    T-cells (turquoise) surrounding a tumour (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus — Stock Photo
    T-cells (turquoise) surrounding a tumour (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus
    Activated macrophage attacking bacteria — Stock Photo
    Activated macrophage attacking bacteria
    School aged boy dressed as Dracula posing in costume on Halloween — Stock Photo
    School aged boy dressed as Dracula posing in costume on Halloween
    Red blood cells and white blood cells — Stock Photo
    Red blood cells and white blood cells
    Protozoan Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoan Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Structural anatomy of human pelvis — Stock Photo
    Structural anatomy of human pelvis
    Meat cuts on worktop in meat factory — Stock Photo
    Meat cuts on worktop in meat factory
    Sicilian halved blood oranges — Stock Photo
    Sicilian halved blood oranges
    3d illustration of lymphocytes attacking cancer cells in human body. — Stock Photo
    3d illustration of lymphocytes attacking cancer cells in human body.
    Female heart and vascular system, digital illustration. — Stock Photo
    Female heart and vascular system, digital illustration.
    Halved blood oranges — Stock Photo
    Halved blood oranges
    Crop unrecognizable sportswoman with curvy body watching heart rate on wearable tracker during workout on street — Stock Photo
    Crop unrecognizable sportswoman with curvy body watching heart rate on wearable tracker during workout on street
    Mobile health. Measuring blood pressure and entering data in the smart phone. — Stock Photo
    Mobile health. Measuring blood pressure and entering data in the smart phone.
    Mosquito feeding on human blood, digital illustration. — Stock Photo
    Mosquito feeding on human blood, digital illustration.
    Realistic human heart model on black background, computer illustration. — Stock Photo
    Realistic human heart model on black background, computer illustration.
    Virus particles spreading through blood stream — Stock Photo
    Virus particles spreading through blood stream
    Rack of test tubes with blood samples in laboratory. — Stock Photo
    Rack of test tubes with blood samples in laboratory.
    Male anatomy showing vascular system, computer illustration. — Stock Photo
    Male anatomy showing vascular system, computer illustration.
    Digital illustration of senior man anatomy showing heart. — Stock Photo
    Digital illustration of senior man anatomy showing heart.
    Plasmodium vivax protozoa and red blood cells, digital illustration. — Stock Photo
    Plasmodium vivax protozoa and red blood cells, digital illustration.
    Illustration of silhouette of obese man with visible heart. — Stock Photo
    Illustration of silhouette of obese man with visible heart.
    Ebola virus particles in blood, digital illustration. — Stock Photo
    Ebola virus particles in blood, digital illustration.
    Illustration of cross section of human skin with hair follicles and blood vessels. — Stock Photo
    Illustration of cross section of human skin with hair follicles and blood vessels.