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Flashcards in Extra Revision Deck (14):

Explain the role of Ctenocephalides Felis in the transfer of feline infectious Enteritis ?

- Caused by a virus ( strain of Parvo)

- Blood sucking parasite

- Flea transmits virus through its saliva

- feeds on infected cat then feeds on healthy cat infecting it.


Describe the size structure and appearance of staphylococcus aureus?

- 0.5-5 Bacteria gram positive Cocci stains purple looks like a bunch of grapes

- Has DNA molecules at the centre no Flagellum

- has cell wall in capsule

- DNA Surrounded by cytoplasm no nuclear membrane

- Organelles found in Cytoplasm


Describe the size structure and appearance of Microsporum Canis?

- 3 um in size is a fungus

- from the Dermatophyte Groupe

- Has Hype tiny tubles filled with cytoplasm + several neucli

- Micronidia cells are 5-15 cells wide

- Leisons are 3-9 cm round

- crusty Leisons with puritic skin plus hair loss

- is highly contagious passed by fomites or direct contact


Which two clinical conditions can be assets thro PCV ?

Anaemia and dehydration

Will be less serum if dehydrated

Less RBC if aneamic


Explain the procedure used to determine the SG of a urine sample ?

- Wear correct PPE
- Calibrate refractometer with distilled water to 1.000
- dry off prism with tissue

- Gently invert urine
- place 1-2 drops of urine on the Prism
- hold refractometer up to the light

- where white and blue line meet take reading and record results
- clean refractometer and dispose of and waste in clinical waste


Explain how the Protozoan parasite Toxaplasma Gondii reproduces ?

- Final host is the cat
- Oocyst's passed in the environment via hosts Feaces

- Oocyst's are then consumed by intermediate host
- once in the system of the int host they divide into Tachyozoites and bradyozotes

- parasite migrates to the tissues it will stay here until elated by the definitive host

- will then move to the SI of the cat to reproduce


Explain the size structure and appearance of canine Parvo virus?

- Is a Virus 20nm in size
- Icsosandreal in shape

- Has a genetic core called the genome
- Genome is protected by the capsid

- capsid is made up of protein sub units called Capsometers


Explain the size structure and appearance of Chlorella Pyrenodosa?

- Is a uni cellular Algae - 5um in size
- Thin cellular wall, has a cell membrane

- has chloroplast
- Takes Sun, water and Oxygen to produce food for its self

- as a species it is 5-20 um in size


Method for a PCV sample ?

- Wear gloves, select EDTA sample agitate gently
- place a plaine microhaematocrit capillary tube in blood sample / hold sample at an angle fill 3/4 full

- place finger over the top remove from capillary tube from blood
- wipe tube with tissue seal end with Crystoseal

- place blood sample in centrifuge Crystoseal end facing outwards
- Always place another tube directly opposite to balance

- screw down inner lip and lock the top
- Spin at 10,000 rpm for 5mins

- Dispose of any waste in hazardous waste


Method for reading a PCV?

- Remove from centrifuge measure PCV using Hawksley Microhaematocrit reader.
- Place tube in groove on reader with clay seal pointing downwards

- line up top of Crystoseal with the zero line at bottom of reader

- Move tube across till top of plasma lines up with the diagonal line at the top of the reader on 100%

- Move adjustable PCV line reader till it meets with the top of the RBC column

- reader the measurement on the right hand of the scale as a percentage


Normal SG parameter for a Dog?



Normal SG range for a Cat?

24 - 45 %


Requirements for posting a sample ?

- Wear PPE, check sample is preserved correctly
- Ensure container is labels correctly date, time,name,sex,breed



Explain the role of the Phlebotomine sand fly in the spread of canine leishmaniasis ?

- sand fly is a blood sucking parasite

- consumes protazoan parasite leishmania from feeding on infected host then biting a healthy host transferring the parasite through saliva