L23(Part1) - B Flashcards
____: Association in which one organism derives benefit (parasite) to the detriment of other (host)
____: A parasite that lives within body/internal body passages of its host
____: A parasite that lives on the body surface of the host
Parasitism
Endoparasite
Ectoparasite
____: Host which harbors adult SEXUAL stage of parasite
____: host which harbors ASEXUAL stage of parasite; essential to parasite lifecycle; transfers parasite from one definitive host to another
Definitive (sexual)
Intermediate (asexual)
______: A vertebrate host that provides a source of parasitic infection to another host in nature
_______: A carrier (usually arthropod) that transmits causative organism of the disease from an infected to an uninfected indivudla
Reservoir
Vector
_____: Dormant, immotile stage that permits survival when environmental conditions are hostile
______: Motile, active feeding and reproducing vegetative stage
_____: The encapsulated fertilized ovum of certain sporozoa
Cyst
Trophozoite
Oocyst
True or False: A Sporozoan is a protozoan with complex life stages (includes: sexual and asexual stages)
True
True or False: Treatment of protozoan parasites are not easy since they are multicellular, prokaryotic organisms
False - Treatment of protozoan parasites are not easy since they are UNICELLULAR and EUKARYOTIC organisms
How do protozoan parasite reproduce?
Mitotic division (bin fis)
Meiosis
True or False: Trichomonas vaginalis is the only protozoa that causes uro-genital infections
True
What are the four major protozoal groups, classified according to mode of locomotion?
1) Amebas
2) Flagellates
3) Ciliates
4) Sporozoa
Which of the following protozoa is an Ameba?
A. Giardia
B. Trichomonases
C. Toxoplasma
D. Enamoeba histolytica
D. Enamoeba histolytica
Which two protozoa are flagellates?
A. Giardia
B. Trichomonases
C. Toxoplasma
D. Enamoeba histolytica
A. Giardia
B. Trichomonases
Which two protozoa are flagellates?
A. Giardia
B. Trichomonases
C. Toxoplasma
D. Enamoeba histolytica
A. Giardia
B. Trichomonases
True or False: Naegleria fowleri is neither an ameba nor a flagellates. Rather, it is something in between.
True
Which four protozoa are sporozoa (PCB + T)?
Plasmodium
Cryptosporidium
Babesia
Toxoplasma
In the trophozoite form, ______ is an active and vegetative amoeba found in the colon that EATS RBC’s and releases PROTEASES (virulence factor!!!)
A. E. histolytica
B. G. lamblia
C. Cryptosporidium parvum
A. E. histolytica
Which stage of E. histolytica is mostly found in formed stool and allows for transmission and infection of NEW host?
A. Cyst
B. Trophozoite
C. Oocyst
A. Cyst
True or False: In the trophozoite form of E. histolytica, the nucleus has a “ring and dot” appearance (peripheral chromatin + karysome)
True
The E. histolytica life cycle:
Ingested form is ___
Excysts in which organ?
A. cyst; small intestine
B. oocyst; large intestine
C. trophozoite; colon
A. cyst; small intestine
In the E. histolytica life cycle, trophs live in the ____ via releasing which enzyme?
Lives in colon
Releases: proteases
How can E. histolytic disseminate to multiple organs?
Via use of protease
When does the cyst for of E. histolytica form?
Feces forms and dries in colon
True or False: E. histolytica is transmitted via food and water and dysentary (bloody diarrhea) is the main manifestation
True
Flask shaped amoebic ulceration, or liver/brain abscess suggests infection by which pathogen?
E. histolytica
True or False: E. histolytica primarily targets the liver and exists in asymptomatic carrier state
True
Which three conditions are associated with infection with E. histolytica?
1) Amoebic dysentery/colitis
- blood + mucus in stool
2) Amoebic liver/brain abscesses
3) Amoeboma
How do you dx E. histolytica?
Microscopic examination of feces (x3 stool)
-Diarrheric feces - trophozoites
-Formed stool - cysts