microbiology lab practical slides

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    Enterobius  pinworm

    Adults like these live in the human colon emerging at night onto the perianal skin to mate and lay eggs.

    Humans become infected by injesting these eggs, and symptoms are mostly confinedd to perianal itching and discomfort.
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    Necator  hookworm

    Historically common in American South other hookworms are found in the tropics and subtropics.

    Adults like these live attached by their mouth parts to the human intestinal wall.

    Heavy hookworm infestation can cause anemia.
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    Schistoma  Human Blood Fluke

    identify male and female individual

    Found coupled in intestinal blood vessel, liver tissue, and intestinal wall of human (definitive) host.
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    Trichinella  pork roundworm

    Trichinosis is practically unknown in the US today.  Humans can become infected by consuming under-cooked pork or sometimes bear meat.
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    Entameba cysts

    Shed in host's feces.

    Entameba trophozoites move by means of pseudopods.  Cysts do not cause entamebiasis symptoms, but are infective when ingested.
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    Balantidium trophozoite

    • Most abundant in the host's small intestine.
    • Move by cilia.

    Cause the symptoms of balantidiasis.
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    Move by flagella.

    Infected by sand fly bites.
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    Move by flagella.

    Infected by cone-nosed "kissing" bugs.
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    Move by flagella.

    Transmission by sexual intercourse.
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    Scolex - face to neck.

    Canids are the usual definitive hosts; deer and other grazing animals are the usual intermediate hosts.

    Humans occasionally ingest Echinococcus eggs becoming accidental intermediate hosts, cause hydatid disease or cysticercosis due to tissue damage by developing larvae.
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    Tapeworm eggs

    Shed in the feces of the tapeworm's definitive host, sometimes encased in proglottids.
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    Mature tapeworm proglottids
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    Tapeworm cystericercus larva

    Found in the muscle and/or viscera of the worm's intermediate host.
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    Giardia cysts

    Cysts are shed in host's feces.
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    Fluke eggs

    Found in water expelled in the feces of an infected host.
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    Fluke miracidia

    Hatch from eggs.  Found swimming in water until they die or encounter the appropriate host snail.
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    Fluke Redia

    Found in the body of the appropriate host snail.
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    Fluke Cercaria

    Found swimming in water after leaving the snail.
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    Fluke Metacercaria

    Found on aquatic plants (like watercress, cattails, etc).  Remain in this stage until they die or until a suitable definitive host (eg sheep, occasionally humans) eats the plants.
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    Fluke Adult

    Hermaphroditic, found in the liver and bile ducts of the definitive host.

    The numerous eggs they lay there will be shed in the host's feces.
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microbiology lab practical slides
Slides for lab practical in microbiology intro.