Parasitology II Flashcards Preview

Microbiology > Parasitology II > Flashcards

Flashcards in Parasitology II Deck (16)
Loading flashcards...
1

parasite in Giardiasis

Giardia Lamblia

2

host and intermediate host of giardasis

host: beavers, dog, humans
intermediate host: none

3

transmission of giardia

food borne or water borne transmission (environmental) --> transmitted in its cyst stage which is when it is infective

if diarrhea, it is commonly seen in its trophozoite stage which is not infective

4

lifecycle of giardia

parasite is discontinuously released in feces (shed in showers)

5

diagnosis of giardia

-cyst in dry stool (hard to find due to discontinuous release)
-trophozoite in watery stool
-therapeutic trial: eat capsule filled with corn attached to a string and trophs attach to capsule if present
-elisa antigen test
-immunofluorescent test (high specificity and high sensitivity but expensive)

6

symptoms of giardia

traveller's diarrhea
Pale loose stools (foul smelling; fatty) Frequency 3-8 X daily
Abdominal distension
Flatulence – offensive
Abdominal pain
Weight loss - anorexia
Sulphorous belching

7

pathogenesis of giardia

severity dependent on:
􏰁Number of organisms
􏰁Virulence of strain (Dog - low path)
􏰁Host immunity
􏰁Mucosal damage
􏰁Secondary bacterial colonization

8

groups at high risk of protracted giardia

immunosuppressed (AIDS patient)
sewage workers
crowded institutions/day care/ city centers
travelers

9

treatment of giardia

metronidazole (flagyl)
tinidazole (tinidamax)

10

control of giardia

improve water tx plants against giardia

11

parasite in amoebiasis

entamoeba histolytica

12

two types of amoebiasis

-Intestinal amoebiasis --> may result in
Amoebic Dysentery

􏰁-Invasive amoebiasis –> usually results in Amoebic Liver Abscesses (ALA)

13

morphology of entamoeba histolytica

cyst containing four nuclei

14

transmission of amoebiasis

ingestion of cysts - fecal oral route

15

clinical manifestation of intestinal amoebic dysentery

􏰁-95% asymptomatic
-􏰁Symptomatic individuals (5%): Diarrhea –
inconsistent with gradual onset, No fever. Flatulence, Abdominal pain
-􏰁Frequency

16

clinical manifestation of invasive ALA (amoebic liver abscesses)

-may form amoebic abscesses in: liver (majority), brain, skin, lungs, orbit, spleen and genitals
-􏰁Fever
-􏰁Tender Liver – Epigastric Pain 􏰁
-Hepatomegaly