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Pathogen

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A microorganism that causes disease.

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Virus

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A tiny, non-living pathogen that replicates only inside living cells.

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Bacteria

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Single-celled organisms that reproduce rapidly and may produce toxins.

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Fungi

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Pathogens that can grow on the skin or inside the body, causing infections.

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Protoctist

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Single-celled eukaryotes, some of which cause diseases like malaria.

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Transmissible Disease

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A disease that can spread from one host to another.

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Direct Transmission

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Disease spread by direct contact with an infected person or fluid.

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Indirect Transmission

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Spread of pathogens via air, water, food, or vectors.

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Vector

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An organism (e.g., mosquito) that carries and transmits a pathogen.

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Skin

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The body’s first line of defense against pathogens.