Types of pathogens

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Belinda Schirmer

Australia

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Compléter Types of pathogensVersion en ligne Complete this daily review activity on types of pathogens. par Belinda Schirmer 1 A pathogen is usually defined as a disease - organism . Many pathogens are , meaning they cannot be seen with the naked eye . For example , some species of and fungi . Protozoa are another of microscopic pathogen . Protozoa are unicellular from eukaryotic kingdoms other than animals , plants and fungi . For example , the Plasmodium species of protozoa cause the malaria , which is transmitted by . 2 Various multicellular parasitic can also be considered pathogens , such as ticks , and some types of worms . These are described as pathogens , as they can be seen by the naked eye . 3 Viruses and prions are two types of non - cellular . Both viruses and prions show some signs of , but are not made of . Scientists debate about whether to classify these non - pathogens as being or not . Hence pathogens are sometimes defined as infective that cause disease .