Microbiology Lab

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created 5 years ago by veamarige
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Parasitic Helminths
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Parasitic Helminths

  • Trematode Parasite (Fluke) - flat worms
  • Cestodes (tapeworms)
  • Nematodes (round worms)
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Trematode Parasite (Fluke) (flat worm)

  1. Clonorchis sinensis - Oriental Liver Fluke
  2. Paragonimus Westermani - Lung Fluke
  3. Schistosoma mansoni - Blood Fluke
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Cestode Parasite (tape worm)

  • Dipylidium caninum
  • Hymenolepis nana
  • Echinococcus granulosus
  • Taenia spp.
    • Taenia Saginata Proglottid
    • Taenia Solium Scolex
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Clonorchis (Opisthorchis) sinensis 

Oriental Liver Fluke / Trematode Parasite (Fluke)

  • Causes clonorchiasis, a liver disease.
  • Infection typically occurs when under-cooked infected fish is ingested.
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Clonorchis sinensis - (Oriental Liver Fluke)

pic.: egg in a fecal specimen

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Clonorchis sinensis Adult

Oriental Liver Fluke

pic.: adult

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Infection typically occurs when under-cooked infected fish is ingested

Causes clonorchiasis, a liver disease

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Paragonimus Westermani

Lung Fluke

Trematode Parasite (fluke)

  • Causes paragonimiasis
  • Infected when eating under-cooked crabs or crayfish infected with the cysts
  • Symptoms: local inflammatory response followed by ulceration, cough with discolored or bloody sputum, difficulty breathing
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Paragonimus Westermani - lung fluke

pic.: egg in a fecal specimen

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Paragonimus Westermani - lung fluke

pic.: Adult

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Infected when eating under-cooked crabs or crayfish infected with the cysts.

Causes paragonimiasis

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Schistosoma mansoni / Blood Fluke

Trematode Parasite (fluke)

  • Infection occurs via contact with fecally contaminated water containing juveniles of the species
  • Symptoms: bloody diarrhea, abdominal pain, and lethargy
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Schistosoma mansoni / Blood Fluke

pic.: egg in a fecal specimen

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Schistosoma mansoni / Blood Fluke

pic.: Adult

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Dipylidium caninum

Cestode Parasite (tape worm)

  • common parasite of cats and dogs
  • infection usually occurs in children

    Symptom: asymptomatic, mild abdominal discomfort, loss of appetite, indigestion
  • Dog, cat, or child ingests one of these fleas
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Dipylidium caninum

pic.: Egg Packet

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Dipylidium caninum

pic.: Scolex

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Dipylidium caninun Proglottids

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Echinococcus granulosus

  • Definitive host is a carnivore.
  • Intermediate host usually an herbivorous mammal
  • Develop hydatid disease.
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Echinococcus granulosus

pic.: cyst in lung tissue

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Echinococcus granulosus -

hydatid disease

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Echinococcus granulosus

pic.: Adult

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Hymenolepis nana

Dwarf Tapeworm

Infection may involve hundreds of worms

symptoms are usually mild

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Hymenolepis nana

pic. Scolex

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Hymenolepis nana

pic. Proglottids

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...

Hymenolepis nana

pic.: egg in a feces

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Taenia saginata

Taenia saginata

Beef Tapeworm

Cysticercosis

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Taenia saginata

pic. Proglottids

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Taenia solium

pic. scolex

Pork Tapeworm
T. solium life cycle is similar to T. saginata.
Cysticercosis

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Ascaris lumbricoides

Large Nematode
1. Ascaris pneumonia occurs in heavy infections due to the lung damage.
2. If secondary bacterial infections occur, the pneumonia can be fatal.

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Enterobius vermicularis

Human Pinworm
1. Favor fecal-oral transmission of the parasite.
2. Poor sanitary habits of children make them especially prone.
3. Transmission may also involve eggs being
carried on air currents.

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Ancylostoma duodenale
Necator americanus

Hookworm

Eggs are passed in the feces.

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Strongyloides stercoralis

Intestinal Threadworm
1. Infection occurs by penetration of the skin by infective juveniles from fecally contaminated soil.

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Wuchereria bancrofti

Filarial Worm
1. causes lymphatic filariasis.
2. Infection occurs from the bite of a mosquito harboring infective juveniles.
3. obstruction of lymphatic vessels occurs and results in elephantiasis.
Abundant at night when the mosquito vector is
active.