Protozoa Flashcards

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
How long is the prepatent period of poultry Eimeria species?	1 week Sporulation takes 2-3 days	Link to Answer Article
Name the malabsorptive Eimeria species	E. maxima E. acervulina E. mitis E. praecox	Link to Answer Article
Name the haemorrhagic Eimeria species	E. necatrix E. brunetti E. tenella	Link to Answer Article
Which area of the gastrointestinal tract does E. acervulina, E. maxima, E. tenella and E. necatrix affect and what kind of lesions are produced?	E. acervulina affects the proximal gut forming white ladder lesions E. maxima affects the mid-gut producing a pink exudate E. tenella affects the ceaca forming a core of dark, haemorrhagic blood E. necatrix affects the mid-gut forming salt and pepper leions	Link to Answer Article
What are the two main Eimeria species which affect cattle and what is the prepatent period?	E. zuernii E. bovis 2-3 week prepatent period	Link to Answer Article
What are the two significant Eimeria species which affect sheep and what is the prepatent period?	E. ovinoidalis E. crandalis 2 week prepatent period	Link to Answer Article
What is the most significant species of Isospora which affects pigs and what the prepatent period?	I. suis 1 week prepatent period	Link to Answer Article
Which parts of the gastrointestinal tract do the Eimeria species which affects rabbits inhabit?	2 inhabit the caecum 1 inhabits the bile duct epithelium (E. steidae)	Link to Answer Article

Cryptosporidia

Question	Answer	Article
What is the main species of Cryptosporidium which infects humans and domestic animals?	C. parvum	Link to Answer Article
True or False: In Cryptosporidium infections unsporulated oocysts are passed in the faeces	False Sporulated oocysts are passed in the faeces	Link to Answer Article
How are Cryptosporidium infections passed between hosts?	Direct faecal-oral transmission Water-bourne infections Autoinfection can also occur	Link to Answer Article
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	Link to Answer Article

Piroplasmida

Question	Answer	Article
True or False: Both trans-stadial and trans-ovarian transmission can occur in Babesia species	True	Link to Answer Article
What are the recognisable features of small Babesia species and give and example	Peripheral nucleus Obtuse angle B. divergens	Link to Answer Article
What are the recognisable features of large Babesia species and give and example	Central nucleus Acute angle B. major	Link to Answer Article
What are the predisposing features to Babesia infection?	Susceptible animals introduced into an infected area Infected ticks introduced into a clean area Infected cattle introduced into an area with clean ticks Temporary reduction in the tick population decreasing the transmission rate (causing enzootic instability) Infected are transported or stressed in other ways, e.g. parturition	Link to Answer Article
What are the different vectors for Babesia species?	Ixodes ricinus for B. divergens Haemaphysalis for B. major Boophilus for B. bovis and B. bigemina Dermacentor and Rhipicephalus for B. canis	Link to Answer Article
What species are the natural vectors for Cytauxzoon?	Ticks	span title="Answer article">Link to Answer Article
Where do schizonts of Cytauxzoon felis develop?	In macrophages	span title="Answer article">Link to Answer Article