هل تعلم عن-> الامتحانات وأجابتها -> امتحانات يناير 2013

امتحانات يناير 2013

امتحانات يناير 2013

Cairo Univ 

Faculty of Veterinary Medicine

Dept Parasitology

أمتحان مقرر الحشرات  305

 
 

المستوي الثالث  والرابع والخامس الإضافي                                   22/1/2013          الزمن:  ساعتان

 

 

 

 

1-       Write full account on the following:              (5 Marks)

a)       The  importance of arthropods               (2)    

b)       Importance of stable and horse flies      (1)

c)        Oestrus ovis among sheep                       (1)

d)       Morphology (Draw) of Musca and Glossina spp. antennae  (1).

A)      Importance of Arthropods:

          The deleterious effect of Arthropods on the health of man and animal can be categorized as follows:-

1.        Indirect effect:

1.1. Transmission of diseases (Mechanical or biological vector) I/H:-  give examples for both and explain the type of biological one.

1.2.Decrease production as in Flies and Lice.

            1.3.Self mutilation as in Lice and Fleas.

            Direct  effect:

2.1. Blood loss as with ticks, sucking lice and mosquitoes.

            2.2.Annoyance as with biting flies, fleas and lice.

            2.3. Toxic substances as with some tick species, spiders, wasps and some ants.

            2.4. Allergy as with bugs, fleas and (mange) mites.

            2.5.Tissue destruction as with myiasis.

            2.6. Suffocation as with black fly.

2.7. Accidental injuries, when insects enter eyes or ears of animals, the animal    injures itself.

2.8. Production of psychological affection ''Entomophobia'', mostly during bot fly or mosquitoes attack.

     B) Stomoxys calcitrans Stable fly  transmit Try. evansi and equi mechanically and

         Habronema microstoma, Setaria cervi and Leishmania sp. biologically.

Tabanus Horse fly serve as biological vectors for the blood parasite Trypanosoma theileri (in cattle), as mechanical vectors for the blood parasites Trypanosoma evansi (causing surra in camels, horses, and additional animals) and Trypanosoma equinum (causing mal de Caderas in horses), and as biological vectors for the filarial parasite Elaeophora schneideri

C) Oestrus ovis among sheep is a case called specific myiasis which When the adult flies are laying and attacking sheep repeatedly, the animals panic, bunch together, press their nostrils into each others' fleeces or against the ground, and cease feeding, with interruption of weight gain. The larvae in the nasal cavities and sinuses cause a muco­purulent discharge, which is usually the only sign of infection.

D)      Draw the aristae of both Musca and Glossina spp.

 

2-       In a table compare between the following:                               (9Marks)

a)       Anopheles and Culex spp.                                                      (3)

b)       Burrowing and non burrowing mites                                   (3)

c)        Human; rat and dog fleas                                                       (3)

Differences between  Anopheles  and Culex spp.

 

Anopheles

Culex

The adult mosquito

1. standing  attitude

 

Stands on surfaces with its body making an angle of 45 proboscis, head thorax & abdomen on one line

Stands with its body parallel to the surface.

Proboscis & head make a curve with thorax & abdomen

2. scutellum

Simple of one lobe, with hairs evenly distributed on its free margin

Trilobed, with hairs in 3 bundles, one from each lobe

 

3.wings

 

Spotted (different coloration of scales on veins & fringe)

None spotted (scales of homogeneous tone.

4. maxillary palps

 

 

a) Male; as long as proboscis with swollen distal end (club shaped).

b)female; as long as proboscis and filamentous

a) Male; as long as proboscis and filamentous (of the same diameter).

b)female short & club- shaped

 

5.color

 

Grayish, some species have silvery white scales.

 

grayish colored

Eggs

1.laid singly

2. Eggs are slipper-shaped when seen dorsoventrally and bot shaped when seen laterally; on the side are air cells.

Laid in groups (50-200) called egg-rafts, each egg is elongated, broad at one pole to which floating apparatus (micropyl) is attached and usually face the water.

Larva: 1.resting  position

Parallel to water surface, feed on materials floating on this surface

Barrel shaped, short and broad. angle of 45

2.Respiratory Siphon tube in Larva

Absent, spiracles are present on 8th seg.

One row

3.Comb on 8th abdominal segment

Absent

Absent

4.Palmate hairs

On dorsolateral surface of thoracic and abdominal segments

Simple

5.Pleural bristles

Compound

Tubular

Importance of mosquitoes:

The effect of bite of mosquitoes varies according to the species and the susceptibility of the host. The bite is usually followed by the appearance of wheals , discomfort, loss of sleep and weakness.

Genus Anopheles Transmits:  1) Malaria of man (several species of Plasmodium)

2)Filaria of dogs (Dirofilaria immitis)

Genus Culex transmits: 1) Malaria of birds   2) Filaria of man (Wucheroria bancrofti)

3) Filaria of dog (D. immitis)

Comparison between burrowing and non-burrowing mites:

Sarcoptidae

Psoroptidae

1. Species of this family burrow more or less deeply into the subst­ance of the skin, caus­ing marked thickening of the skin, rather than the formation of scabs.

2.  The body of the mite is globose.

3. The striae of the skin are often interrupted by scaly or spinose areas.

4.  The legs are short. 3rd pair not project beyond body margin.

5. The pedicels of the tarsal suckers of all species are not segme­nted.

6. Legs 3 and 4 of the females only end in bristles instead of suckers (caruncles).

7. The male has no adanal suckers (copulatory discs).

8. The posterior margin of the abdomen of the male not bilobed.

1. Species of this family do not burrow into the skin, but are parasitic in its sur­face layers, causing the formation of thick heavy scabs rather than thickening of the skin.

2. The body of the mite is oval.

3. There are no dorsal spines.

4. The legs are longer and project beyond the mar­gin of the body.

5. The pedicels of the tarsal suckers are long and composed of three segments,

6. Legs 3 of the females only end in bristles instead of suckers.

7. The male has adanal suckers (copulatory discs).

8. The posterior margin of the abdomen of the male is produced into two lobes.

Morphological differences between the most common Flea species:

 

Genal comb G. C.

Pronotal comb P.N.C.

Mesopleural suture M.P.S.

Postoccupital hair P.O.H.

Ctenocephalides canis

Dog Flea

Present

Present

Present

Present

Xenopsylla cheopis

Rat Flea

Absent

Absent

Present

Present

Pulex irritans

Man Flea

Absent

Absent

Absent

Only one hair

3-       Describe briefly the four legged arthropod which transmit a blood protozoon parasite to cattle

(morphology, life cycle and importance)                                        (6 marks)

Hard ticks, they have a chitinious scutum, which extends over the whole dorsal surface of the male and covers only a small portion behind the head in the larva, nymph and female. the mouth parts are anterior and well visible from the dorsal aspect . Eyes when present consist of one pair situated on the lateral margin of the scutum . The imago has one pair of spiracles situated postero-laterally to the fourth coxae.The basis capituli carries the mouth parts and palps, shows two dorsal porose areas in the female. The scutum has  grooves, varying in depth and length in different species. The posterior border of the body is frequently notched, forming the ''festoons''. The genital opening is a ventral transverse slit in front of the middle. The anus is being posterior.

 

 

The larvae are three legged while nymphae are four legged and without genital opining.

Life cycle: lay their egg in sheltered spots: under stones and clods of soil or in crevices of walls and crakes of wood near the ground. The female lays all her eggs in one batch, numbering up to 18,000 in some species, and then dies. The whole process of development to the adult stage is greatly influenced by the rearing temperature, cold weather causing marked prolongation of the different stages, especially hatching of the eggs and the preoviposition period of the engorged female. The newly hatched larvae or ''seed ticks'' climb on to grass and shrubs and wait there till a suitable host passes, to which they attach themselves with their claws after having engorged, the larva molts and becomes a nymph. The integument of the latter requires a few days to harden, and then the nymph engorges and molts to become an imago (40-60 days all).

Importance: Ticks may harm their host by: (a) injuries done by their bites, which may predispose the hosts to attacks by blowflies, screw-worm flies and biting flies generally; (b) sucking blood; (c) transmitting the viruses rickettsiae, bacteria and protozoa ( all types of Babesia, Theileria and Anaplasma ).The harm done by their bites and blood-sucking generally known as ''tick worry''. This is probably a combination of several entities including irritation from the tick bites, local skin infection, blood loss, and secondary attack by flies. Tick pyaemia and  A further effect is the damage produced to hides . Tick paralysis.

4-       Mention the followings:                    (5 marks)

       Peudolynchia spp. (impotance) (1)                                Follicular mange (cause)               (1/2)

Winged bugs (Importance)           (1)                           Cyclops (importance)                     (1)                             

Camel nasal bot fly (cause)                       (1/2)                      Ants  (impotance)                           (1)

Haemoproteus columbae and blood sucking                           Demodex folliculorum

Tryp. Cruzi and blood sucking                         Hymenolepis, Diphyllobothrium and medina worm

Cephalopina titillator                                                  Dicrocoelium, Cotugnia, Railliatina…..

 

__________________________________________________________________

Cairo University

Faculty of Veterinary Medicine

Department of Parasitology

  Examination of Course 306 (Protozoa))

17 January, 2013                                         مستوي ثالث ورابع                                      Time: 2hours

Please answer Five only of the following questions:

I-                    In a table enumerate the protozoa infecting Gastrointestinal  tract of birds with habitat,

        infective stage and write life cycle of one of them with economic importance. (5marks)

II-                  How could you differentiate between the following, mention only 3 differences: (5  marks)

a.       Babesia spp and Theileria spp.                      (2)

b.      Eimeria spp and Cryptosporidium spp          (2)

c.       Haemoproteus spp and Plasmodium spp      (1)

III-                Mention three of  tissue protozoa and draw life cycle of one of them.(5 marks)

IV-               Enumerate 3  dog protozoa and mention the life cycle of one of them with Zoonotic importance. (5 marks)

V-                 Write short notes on the following: (5 marks)

a.       Types of protozoa movement with examples.                  (2)

b.      Trypanosoma infecting Egyptian animals.                          (2)

c.       Asexual reproduction in protozoa                                        (1)

VI-               Write short notes on the life cycle of one of the following:                (5 marks)

a.       Anaplasmosis                                                                                 (2.5)

b.      Leishmaniassis                                                                                (2.5)

 

                                                                                                                                     Best wishes

Dr Magdy Mostafa Fahmy

 

Cairo University

Faculty of Veterinary Medicine

Department of Parasitology

  Examination of Course 306 (Protozoa))

17 January, 2013                                         مستوي ثالث ورابع                                      Time: 2hours

Model Answer

Please answer Five of the following questions:

I-                    In a table enumerate 5 of the protozoa infecting Gastrointestinal tract of birds with habitat, infective stage and write life cycle of one of them with economic importance. (5marks)

Name of parasite

Habitate

Infective stage

Eimeria

Intestine

Sporulated oocyst

TetraTrichmonas gallinarum

Caecum and liver

Trophozoite (vegetative form)

Trichomans gallinae

Proventriculus

Trophozoite (vegetative form)

Histomnas meleagridis

Caecum and liver

 Heterakis egg containing Histomonas trophozoite

Cryptosporidium

Intestine

Sporulated oocyst

 

II-                 How could you differentiate between the following, mention only 3 differences: (5  marks)

a.       Babesia spp and Theileria spp.

Differentiation

Babesia

Theileria

Intermediate host

One host Hard Tick

2-3 Hard soft tick

Final Host

Cattle – sheep – Dogs – horse

Cattle - Horse

Schizogony

RBCS

Lymphocyte

Main storage

Liver

Lymphocyte

Symptoms

Haemoglobin urea – fever

Fever – no Haemoglobin urea

Transmission

Transovarian

Stage to stage

Direct infection

Available

Not available

 

b.       Eimeria spp and Cryptosporidium spp

Differentiation

Eimeria

Cryptosporidium

Final host

Poultry – cattle -

Mammals – fish - birds

Oocyst in feces

Unsporulated

Sporulated oocyst

Sporulation

In intestine of Final Host

environment

Sporulated oocyst

Disporocustic tetrazoic

Tetrazoic oocyst

 

c.        Haemoproteus spp and Plasmodium spp

Differentiation

Haemoproteus spp

Plasmodium spp

Final Host

Culicoides

Mosquitoes

Intermediate host

Pigeon

Birds and mammals

Schizogony

Pre-erythrocytic stage

Pre-erythrocystic stage - RBCs

 

III-               Mention 3 of tissue protozoa and draw life cycle of one of them.(5 marks)

                                                                                         a.       Sarcocystis spp

 

b.       Toxoplasma

c.        Besnoitia

 

 

 

 

 

 

 

IV-               Enumerate 3  dog protozoa and mention the life cycle of one of them with Zoonotic importance. (5 marks)

a.       Leishmania

b.       Isospora

c.        Sarcocystis

 

V-                  Write short notes on the following: (5 marks)

a.       Types of protozoa movement with examples.

                                                               i.      Flagella- Trypanosoma

                                                              ii.      Psudopodia= Entamoeba

                                                            iii.      Gliding = Coccidia – Babesia

                                                            iv.      Cilia = Balantidium

b.       One of the Trypanosoma spp infecting Egyptian animals.

                                                               i.      Trypansoma evansi

 

c.        Asexual reproduction in protozoa with examples

                                                               i.      Sporogony = Plasmodium

                                                              ii.      Schizogony = Eimeria

                                                            iii.      Binary fission= Babesia

VI-               Write short notes on the life cycle of one of the following:

a.       Anaplasma maginale

  

b.       Leishmania tropica

 

 _________________________________________________________________________

Cairo University

Faculty of Veterinary Medicine

Department of Parasitology

  

  Examination of Course 256 (Helminthology)

___________________________________________________________

24 January, 2013            مستوي ثالث ورابع وخامس وخامس إضافي          Time : 3hours

 

Answer the following questions, illustrate your answer with diagrams, whenever possible:

 

 

1- Write an account on only four of  the following:      (16 marks each 4)

        (Hosts, habitats , Morphology, Infective stage and life cycle)

 

a-   Fasciola gigantica.

b-   Heterophyes Heterophyes.

c-   Echinostoma revolutum

d-   Types of  host according to susceptibility.

e-   Dicrocoelium spp

 

2-     What do you know about only four of the following specially with life cycle:-                                               (14 marks each 3.5)                                                         

 

a-   Raillietina species.                                          

b-   Moniezia species.

c-   Dipylidium caninum.

d-   Metacestodes of Cyclophyllidea. 

e-   Diphyllobothrium latum.

 

B. Comment on the following:                                      (20 marks each 5)

 

a-   Development of Nematodes in final hosts

b-  Lung worms of small ruminants

c-   Trichinella spiralis.

d-  Strongylus Species.

 

                                                                                                 

 

                                                                                                Good luck

                                                                              Dr Magdy Mostafa ahmy

 ___________________________________________________________________________

 

 

 

 

هل تعلم عن->الامتحانات وأجابتها->امتحانات يناير 2013