Protozoa Flashcards

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PROTOZOA
WIKIBUGS FLASHCARDS


Toxoplasma gondii - Ke Hu and John Murray

Protozoa

Question Answer Article
What are the four different ways protozoa can move?
  • Cilia
  • Flagellum
  • Pseduopodia
  • Gliding
Link to Answer Article
How do protozoa reproduce?
  • By binary fission
  • By schizogony
  • By sporogony
  • By gametogeny
Link to Answer Article
Briefly summarise the life cycle of protozoa
  • The infectious sporozoite are released from the oocyst invading epithelial tissue
  • The nucleus of the sporozoites divides forming a schizont which contains merozoites (schizogony)
  • Schizont ruptures releasing merozoites which form micro and macrogamonts in the epithelial tissue (gametogeny)
  • Microgamonts penetrate the macrogamont forming the zygote
  • The zygote forms the oocyst which is passed in the faeces
  • Sporulation occurs which makes the oocyst infectious
Link to Answer Article

Coccidia

Question Answer Article
What is the transmission and life cycle of Eimeria species?
  • Direct transmission
  • Faecal-oral route
Link to Answer Article
What is the transmission and life cycle of Isospora species?
  • Usually direct transmission by the faecal-oral route
  • Some species use facultative intermediate hosts forming tissue cysts
    • Transmission is then by the faecal-oral or route or via ingestion of the intermediate host
Link to Answer Article

Cryptosporidia

Question Answer Article
What is the main species of Cryptosporidium which infects humans and domestic animals?
  • C. parvum
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True or False: In Cryptosporidium infections unsporulated oocysts are passed in the faeces
  • False
  • Sporulated oocysts are passed in the faeces
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How are Cryptosporidium infections passed between hosts?
  • Direct faecal-oral transmission
  • Water-bourne infections
  • Autoinfection can also occur
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How are Cryptosporidium infections prevented?
  • Isolate and quarantine brought in calves
  • Good hygiene and adequate disinfection of calf pens
  • Goog hygiene of humans working and visiting farms
  • Halofuginone and other drug treatments
Link to Answer Article

Giardia

Question Answer Article
What is the key points of the life cycle and prepatent period of Giardia?
  • Simple life cycle
  • Direct life cycle
  • Reproduce by binary fission
  • 5-6 day prepatent period
Link to Answer Article
How do both people and animals become infected by Giardia?
  • Water bourne transmission
  • Direct faecal-oral transmission
Link to Answer Article
How would you diagnose a Giardia infection?
  • The cysts are heavy and do not float well in saturated sodium chloride solution
  • Cysts excretion is intermittent so faeces need to be collected and sampled over 3 days
  • Cyst antigen can be detected in faeces by an immunoassay
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Piroplasmida

Tissue Cyst Forming Coccidia

Tropical Protozoa

Other Important Protozoa