PARASITOLOGY

This subject is the study of organisms that live in or on another organism (host) from which they derive nourishment and give no useful return. These organisms are called parasites which can produce harmful effects on the host in the form of diseases. There are several kinds of parasites; therefore a practicing veterinarian should have a sound knowledge of the parasites to understand its nature which could be a basis for its control. The Philippines is a country and a favorable abode for all kinds of parasites.

I. ENTOMOLOGY (30%)

Important Arthropods ff domestic animals, their biology, pathogenecity, transmission and control (Order Mallophaga, Cullidae, Myiasis Flies, Sucking and Biting Lice Mammals, Biting Lice Of Poultry, Mites And Ticks). Understanding the basic characteristics and morphology of arthropods can serve as a basis for the disease and its control.


SAMPLE QUESTIONS

1. It is the transmitter of Aegyptianella pullorum.

a. Ixodes ricinus

b. Dermanyssus gallinae

c. Ornithonyssus bursa

d. Argas persicus


2. Tick infestation in dogs may be controlled by any of the following except:

a. Lindane

b. Amitraz

c. Dichlorvos

d. Carbaryl


3. What is known as the canine chewing louse?

a. Linognathus setosus

b. Demodex canis

c. Trichodectes canis

d. Ctenocephalides canis


4. The basal joins of the pedipalps of arachnids are called:

a. Prosoma

b. Chelicerae

c. Gnathobases

d. Opisthosoma


5. Where does the female Sarcoptes scabiei lay its eggs?

a. On the skin

b. Underneath the skin

c. On the ground

d. Hair shaft

II. PROTOZOOLOGY (30%)

Important Protozoan parasites of domestic animals, their structure, morphology, nutrition and reproduction including the pathogenecity, transmission and control (Trypanosomosis, Trichomonas, Hexamia, Giardia, Histomonas, Sacrodina, Leishmania, Coccidia, Toxoplasma, Sarcocystis, Plasmodia, Leucocytozoon, Babesia, Haemoproteus, Theileria, Hepatozoon, Anaplasma, Ehrlichia, Balantidium coli, Haemobartonella and Eperythrozoon).

Understanding the basic characteristic s and morphology of protozoan parasites can serve as a basis for the disease and its control.


SAMPLE QUESTIONS

1. Which statement is true in Babesia infections?

a. Young animals are naturally resistant

b. None of these

c. Older animals are more resistant

d. Young and old animals are susceptible


2. Leucocytozoon gametocytes differ from those of Plasmodium and Hemoproteus in:

a. Shape

b. All of these

c. Not containing pigment granules

d. Size


3. Canine babesiosis is caused by the following EXCEPT:

a. Babesia felis

b. Babesia canis

c. Babesia trautmanni

d. Babesia gibson


4. Transmission of Theileria parva is:

a. Intramammary

b. Transovarian

c. Transuterine

d. Stage to stage


5. What is the definitive host of Toxoplasma gondii?

a. Dog

b. Chicken

c. Pig

d. Cat

III. HELMINTHOLOGY (30%)

Important helminths of domestic animals, their morphology, biology, pathogenecity, epidemiology, and control (Trematodes, Cestodes and Nematodes)

Understanding the basic characteristics and morphology of helminths parasites can serve as a basis for the disease and its control.


SAMPLE QUESTIONS

1. What is the most common tapeworm of the dog?

a. Dipylidium caninum

b. Spirometra mansonoides

c. Diphyllobothrium latum

d. Hymenolepis nana


2. It is known as the nodular worm of sheep:

a. Ostertagia ostertagi

b. Haemonchus contortus

c. Dictyocaulus filaria

d. Oesophagostomum columbianum


3. It is found in the urinary bladder of the dog:

a. Trichuris vulpis

b. Dirofilaria immitis

c. Capillaria plica

d. Toxocara canis


4. It is called the “giant kidney worm”.

a. Stephanurus dentatus

b. Mecistocirrus digitatus

c. Diotophyme renale

d. Strongyloides ransomi


5. Which of the following nematodes have alternate free-living and parasitic generations?

a. Strongyloides spp.

b. Trichostongylus spp.

c. Hyostrongylus spp.

d. Haemonchus spp.

IV. PARASITES OF WILD BIRDS, EXOTIC ANIMALS, AND WILD ANIMALS (5%)

Understanding wildlife and feral animal’s parasites can serve as a basis for the disease and its control and wildlife conservation. (5%)


SAMPLE QUESTIONS

1. A filariform worm which is usually found in nodules on the brisket and hindlimbs of cattle in Asia:

a. Onchocerca reticulata

b. Onchocerca raillieti

c. Onchocerca gibsoni

d. Onchocerca cervicalis


2. The hookworm affecting foxes is:

a. Uncinaria stenocephala

b. Uncinaria caninum

c. Ancylostoma caninum

d. Ancylostoma intestinale


3. The following are signs of parasitic disease in reptiles EXCEPT:

a. Diarrhea

b. Lethargy

c. Continued weight loss

d. Inappetence

V. PARASITES OF FISHES AND OTHER AQUATIC ANIMALS (5%)

Understanding aquatic mammalian parasites.


SAMPLE QUESTIONS

1. The coccidian species causing enterities in goldfish is:

a. Eimeria cyprini

b. Eimeria carpi

c. Eimeria subepitheliasis

d. Eimeria ischii


2. Which of the following fish protozoa has been reported in the Philippines?

a. Amyuloodinium carpi

b. Cryptobia brachialis

c. Cryptobia cyprini

d. Cryptobia borreli

REFERENCES

1. Diseases of Feedlot Cattle. 1979. Jensen, R and Mackey, D.R. Lea and Febiger, Philadelphia

2. Diseases of Swine. 1981. Leman A.D. et al. Iowa State University Press.

3. Fish Diseases and Disorders. Vol I Protozoan and Metazoan Infections. 1995. Woo, P.T.K. CAB International: Willingford, Oxford, UK.

4. Helminths, Arthropods and Protozoa of Domesticated Animals by EJL Soulsby

5. Parasites and Diseases of Fish Cultured in the Tropics. 1985 Kabata, Z. Taylor and Francis. London and Philadelphia.

6. Parasitology for Veterinarian, 3rd ed. 1980. Georgi, Jay R.

7. Patterns of Animal Disease. 1982. Halpin, Brendan. Baillere Tindall Publisher

8. Philippine National Veterinary Drug Formulary. Vol 1, 1st ed., 1993., published by the DOH-National Drug Policy Program

9. Philippine Textbook of Medical Parasitology. 1998. Belization VY Jr. And Solon. JAA The UP Publication Program, Information Publications and Public Affairs Office, Manila.

10. Textbooks of Parasitology, 3rd ed. 1965 Belding, David Lawrence. New York.

11. Veterinary Clinical Parasitology. 1961. E.A. Benbrook and Margaret, W.S. Loss

12. Veterinary Medicine and Human Health. 2nd ed. 1969 Schwabe, Calvin W. The Williams and Williams Company, Baltimore.

13. Zoonoses and Communicable Diseases Common to Man and Animals. 2nd ed. 1989. Acha P. W. and Szyfres the Pan American health Association (PAHO).

14. Poultry Diseases 3rd ed. 1990, FTW Jordan. Baillere Tindall/WB Saunders.