cystoisospora canis Flashcards Preview

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Flashcards in cystoisospora canis Deck (26):
1

phylum

apicomplexa

2

order

eucoccidiorida- parasite of epithelial cells

3

common name

coccidia

4

hosts

dogs

5

paratenic hosts

rodents

6

cat species parasite

cystoisospora felis/ rivolta

7

how many cells do unsporulated oocysts have?

one

8

have many sporocystes are in each sporulated oocyst?

2 sporocysts each with 4 sporozoites

9

size

50 micrometers

10

sporulation phase

unsporulated oocyst pass in feces
sporulation takes place outside the host
sporulated oocysts is the infective stage

11

how does a dog get infected?

from eating the tissues of rodents infected with asexual stages

12

what are the three phases of formation?

sporulation, schizogony and gametogony and oocyst formation

13

what is the infective stage?

sporulated oocyst

14

what happens when a paratenic host ingest the oocyst?

sporozoites released invade the tissues and organs to form a cyst. when paratenic host and cysts are ingested by final host the sporozoites are released from the cyst in the final host

15

what is the asexual reproduction called?

schizogony

16

what is the sexual reproduction called?

gametogony and oocyst formation

17

schizogony phase

asexual phase- definitive host becomes infected by ingesting sporulated oocyst.
each sporocyst releases 4 sporozoites
each sporozoite gives rise to a shizont containing merozoites
merozoites ruputer out of the intestinal cell, enter another cell and become another generation of shizont

18

gametogony phase

sexual phase- merozoites give rise to male and female gametocysts. fusion and fertilization of micro and macro gametes take place and a cyst wall forms
results in a zygote , now and oocyst
unsporulated oocyst passes in feces

19

what are the female gametocysts?

macrogametocystes- unicellular but increase in size
they have a single large nucleus

20

what are the male gametocysts

microgametocytes- undergo repeated division to form flagellated microgametes

21

PPP

4-11 days

22

site of infection

small intestine

23

pathogenesis

small intestinal cells destroyed

24

clinical signs

asymptomatic, except young dogs have diarrhea

25

diagnosis

fecal flotation

26

treatment

management is critical