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    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).
    Blastomyces dermatitidis fungus, computer illustration. — Stock Photo
    Blastomyces dermatitidis fungus, computer illustration.
    Mycobacterium chimaera bacteria, computer illustration. — Stock Photo
    Mycobacterium chimaera bacteria, computer illustration.
    Swine influenza virus microscopic view — Stock Photo
    Swine influenza virus microscopic view
    Blastomyces dermatitidis fungus, computer illustration. — Stock Photo
    Blastomyces dermatitidis fungus, computer illustration.
    Balamuthia mandrillaris amoeba, computer illustration. — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration.
    Balamuthia mandrillaris amoeba, computer illustration. — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration.
    Computer illustration showing different stages of release of malaria merozoites from a red blood cell. — Stock Photo
    Computer illustration showing different stages of release of malaria merozoites from a red blood cell.
    Giardia lamblia, a protozoan (cyst stage) found in water contaminated by animal faeces, coloured scanning electron micrograph (SEM). — Stock Photo
    Giardia lamblia, a protozoan (cyst stage) found in water contaminated by animal faeces, coloured scanning electron micrograph (SEM).
    Balamuthia mandrillaris amoeba, computer illustration. — Stock Photo
    Balamuthia mandrillaris amoeba, computer illustration.
    Cryptococcus gattii fungus, computer illustration. — Stock Photo
    Cryptococcus gattii fungus, computer illustration.
    Protozoan infection in human intestinal lumen — Stock Photo
    Protozoan infection in human intestinal lumen
    Protozoan infection in human intestinal lumen — Stock Photo
    Protozoan infection in human intestinal lumen
    Bacilli bacteria in the intestine — Stock Photo
    Bacilli bacteria in the intestine
    Artwork of bacilli bacteria — Stock Photo
    Artwork of bacilli bacteria
    Rod-shaped bacteria Corynebacterium diphtheriae — Stock Photo
    Rod-shaped bacteria Corynebacterium diphtheriae
    Rod-shaped bacteria Corynebacterium diphtheriae — Stock Photo
    Rod-shaped bacteria Corynebacterium diphtheriae
    Acetic acid bacteria — Stock Photo
    Acetic acid bacteria
    Clostridium botulinum bacteria — Stock Photo
    Clostridium botulinum bacteria
    Abstract pathogenic microorganisms — Stock Photo
    Abstract pathogenic microorganisms
    Bacteria found in a sample of human faeces — Stock Photo
    Bacteria found in a sample of human faeces
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Clostridium botulinum bacteria — Stock Photo
    Clostridium botulinum bacteria
    Neisseria meningitidis bacteria — Stock Photo
    Neisseria meningitidis bacteria
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Satellite necrosis virus — Stock Photo
    Satellite necrosis virus
    Acetic acid bacteria — Stock Photo
    Acetic acid bacteria
    Legionella pneumophila bacteria — Stock Photo
    Legionella pneumophila bacteria
    Neisseria meningitidis bacteria — Stock Photo
    Neisseria meningitidis bacteria
    Bacteria found in a sample of human faeces — Stock Photo
    Bacteria found in a sample of human faeces
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Q fever bacteria inside a cell — Stock Photo
    Q fever bacteria inside a cell
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Satellite necrosis virus — Stock Photo
    Satellite necrosis virus
    Destruction of human cytomegalovirus — Stock Photo
    Destruction of human cytomegalovirus
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Q fever bacteria inside a cell — Stock Photo
    Q fever bacteria inside a cell
    Destruction of human cytomegalovirus — Stock Photo
    Destruction of human cytomegalovirus
    Staphylococci bacteria colony — Stock Photo
    Staphylococci bacteria colony
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Non-pathogenic Propionibacterium bacteria — Stock Photo
    Non-pathogenic Propionibacterium bacteria
    Bacteria infecting organism — Stock Photo
    Bacteria infecting organism
    Destruction of human cytomegalovirus — Stock Photo
    Destruction of human cytomegalovirus
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Bacterial cells on tissue surface — Stock Photo
    Bacterial cells on tissue surface
    Flu virus particle structure — Stock Photo
    Flu virus particle structure
    Strands of Actinomyces viscosus — Stock Photo
    Strands of Actinomyces viscosus
    Flu virus particle structure — Stock Photo
    Flu virus particle structure
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Growing bacterial colony — Stock Photo
    Growing bacterial colony
    Lymphocytes attacking viruses — Stock Photo
    Lymphocytes attacking viruses
    Bacterial cells on tissue surface — Stock Photo
    Bacterial cells on tissue surface
    Streptococcus bacteria structure — Stock Photo
    Streptococcus bacteria structure
    Rod-shaped bacteria infecting organism — Stock Photo
    Rod-shaped bacteria infecting organism
    Salmonella sp. bacteria on tissue surface — Stock Photo
    Salmonella sp. bacteria on tissue surface
    Bacterial infection of tissue lining — Stock Photo
    Bacterial infection of tissue lining