PARASITOLOGY

LECTURE EXAM I

THOMAS P. BUCKELEW, PH.D.

I.                    Define the terms  and give an example of each. (10 points)

1.      facultative parasite

2.      paratenic host

3.      definitive host

4.      reservoir host

5.      zoonosis

II.                 Identify the organism (genus and species) described by the following: (30 points)

1.      pseudopodia, mostly binucleate

2.      Dum-Dum, Donovan

3.      monoxenous, North American quarantines, kinetoplast

4.      commensal, no cysts, colon

5.      cardiomyopathy, Brazil

6.      octaflagellate, avian diarrhea

7.      elephants, surra, Turkey

8.      anterior station, dry climate, Glossina morsitans

9.      contagious mucous, Bolivia, Lutzomyia

10.  self-limiting disease, lasting immunity, Psycodidae

11.    abortions, trailing free flagellum

12.  Lutzomyia, Hondurus

13.  commensal, colon, flagella, no axostyle

14.  ablastin, Nosopyllus

__

15.  tabanid flies, dyskinetoplasty

III.               Complete the chart (30 points)

Organism         Site of Infection        Vector       Disease       Endemic Area       Means

                                                       (none if                              (country)               of

                                                       applicable)                                                 Diagnosis

Trypanosoma

brucei brucei

                             Skin

                                                        Lutzomyia

                                                                                Murrina

                                                                                                    India  

                                                                                                                        Xeno-     

                                                                                                                         Diagnosis

IV.              Name three epidemiological factors affecting the spread of the following: (15 points)

1.      Trypanosoma cruzi

2.      Leishmania donovani

3.      Trichomonas vaginalis

4.      Giardia lamblia

5.      Trypanosoma brucei rhodesiense

V.  Answer ONE of the following for 15 points.

Draw and label a trypomastigote and epimastigote.  Make you drawings large enough to accurately label.  What changes occur in shifting Trypanosoma brucei gambiense from trypomastigote to epimastigote, relative to the host and the changing metabolism of the parasite.( 15 points)

                                                        OR

  Compare Trypanosoma brucei rhodesiense and Trypanosoma lewisi relative to their pathogenicity and why they differ so widely.  What broader implications does the comparative pathogenicity have relative to the evolutionary duration of the host/parasite relationship.