Parasitology: Coccidia

Front 1

Coccidia belong to the _________ class of protozoa.

Back 1

sporozoa

Front 2

Three types of Coccidia:

Back 2

1. Intestinal
2. Tissue
3. Blood

Front 3

Intestinal Coccidia (4)

Back 3

1. Isospora belli
2. Sarcocystis species
3. Cyclospora
4. Cryptospiridium parvum

Front 4

Tissue Coccidia (1)

Back 4

Toxoplasma gondii

Front 5

Blood Coccidia (1)

Back 5

Plasmodium species

Front 6

Coccidia exist in which two forms

Back 6

1. oocyst
2. sporozoite

Front 7

Oocyst is the ___________ form

Back 7

sexual

Front 8

Sporozoite is the _________ form

Back 8

asexual

Front 9

Humans are infected by ____________ (2 ways)

Back 9

1. ingesting food/water contaminated with oocyst
2. ingesting tissues infected with sporozoite

Front 10

(intestinal coccidia) Humans ingest ________

Back 10

oocysts

Front 11

(intestinal coccidia) oocysts contain ___________

Back 11

sporozoites

Front 12

(intestinal coccidia) Oocysts burst and sporozoites are released in the ___________

Back 12

stomach

Front 13

(intestinal coccidia) sexual reproduction is known as ___________

Back 13

gametogony

Front 14

(intestinal coccidia) asexual reproduction is known as ____________

Back 14

schizogony

Front 15

(intestinal coccidia) Oocysts are passed in _______

Back 15

feces

Front 16

Isospora belli infection is caused by _______________

Back 16

ingestion of oocyst

Front 17

Isospora belli- host

Back 17

human intestinal tract; it has no intermediate host

Front 18

Isospora belli infections are typically ___________

Back 18

asymptomatic/mild

Front 19

Isospora belli infections are increasing due to _____

Back 19

AIDS patients and immunocompromised

Front 20

Sarcocystis species- definitive host

Back 20

human intestinal tract

Front 21

Sarcocystis species- intermediate host (asexual reproduction)

Back 21

pigs, cattle, wild animals

Front 22

Sarcocystis form that will be seen in feces

Back 22

sporocysts (containing 4 sporozoites)

Front 23

Sarcocystis prevention

Back 23

adequately cook beef and pork; be careful around animals that may have oocysts

Front 24

Cyclospora outbreaks are linked to ____________________

Back 24

imported strawberries, raspberries, basil, and baby lettuce leaves; also unsanitary conditions in areas such as Peru

Front 25

Cryptosporidium parvum: humans ingest which form?

Back 25

mature oocysts

Front 26

Cryptosporidium parvum is ingested by humans, how? (3 ways)

Back 26

1. fecally contaminated food/water from infected animals
2. direct contact of infected animals (cows, rodents, dogs, cats)
3. Person to person

Front 27

Cryptosporidium oocysts can be seen in the feces within ______ days of infection.

Back 27

7-28 days

Front 28

Cryptospiridium oocysts are tiny. They are usually what size?

Back 28

4-6µm

Front 29

____________ and __________ are more susceptible to Cryptosporidium infections

Back 29

AIDS patients and immunocompromised

Front 30

Children in daycare centers are affected by which intestinal coccidia?

Back 30

Cryptosporidium

Front 31

Can cryptosporidium be eliminated by chlorination or post treatment of water supplies?

Back 31

No

Front 32

Cryptosporidium: treatment

Back 32

spiramycin

Front 33

Toxoplasma gondii infects __________ of humans

Back 33

CNS

Front 34

Toxoplasma gondii: sexual stage occurs ___________

Back 34

intestine of cats, where they form into oocysts

Front 35

Infective form of Toxoplasma gondii is ________

Back 35

Oocysts

Front 36

Oocysts of Toxoplasma gondii can remain viable in soil for ___________

Back 36

18 months

Front 37

Asexual stage of Toxoplasma gondii occurs in __________

Back 37

grass and meat eating animals and humans, where they form trophozoites (or tachyzoites)

Front 38

Tachyzoites are ____________

Back 38

rapidly moving trophozoites

Front 39

Direct transportation for Toxoplasma gondii

Back 39

ingestion of oocysts in food or water contaminated with cat feces (hand to mouth)

Front 40

Indirect transportation for Toxoplasma gondii

Back 40

ingestion of raw or undercooked meat of animals that have ingested oocysts

Front 41

Transplancental transfer of Toxoplasma gondii

Back 41

transmission occurs during pregnancy to unborn child from infected mother

Front 42

Lab identification of Toxoplasma gondii

Back 42

clusters of tachyzoites in tissue secretions, bow shaped-- best seen with Wright's or Giemsa stain

serological test for Toxoplasmosis antibody to diagnose active infection

Front 43

Toxoplasmosis infections mimic ____________

Back 43

infectious mononucleosis

Front 44

_____________ and __________ have increased susceptibility to Toxoplasmosis infections

Back 44

People with AIDS and drug users

Front 45

_____________________ are at greater risk for progression of disease to CNS

Back 45

premature or Ab deficient infants

Front 46

Humans can be accidentally infected with Toxoplasmosis gondii via ____________ (it's RARE)

Back 46

transfusion of contaminated blood