Infectious diseases Flashcards
What does blastomycosis look like cytologically?
- 10-40ug
- thick blue wall
- budd in broad based fashion with daughter celsl of similar size
- stain positively with PAS stain
+ non degent to apop neutrophils, necrotic debris (supprative to pyogranulomatous)
Thompson VCNA 2017
What does histoplasmosis look like cytologically?
- 3-5ug
- colourless cell wall with dark interior
- found within macrophages or occasionally free secondary to lysed cells.
- inflam usually macrophagic to granulomatous
Thompson VCNA 2017
What does cryptococcus look like cytologically?
- 8-40ug and round with thickened all and dark interior
- capsule up to 200ug. colourless and non staining
- narrow based budding
- Macrophages +/- eosinophils
- can have non-encapuslated form that looks like blasto. stain with PAS to identify.
Thompson VCNA 2017
What does sporotrichosis look like cytologically?
- 3 -5 um by 5-9um.
- round to oval, budding
- within Neuts and macrophages
- mixed to pyogran inflam
Thompson VCNA 2017
What does aspergillus look like cytologically?
- fungal hyphae are septate every 2-8um and have dichotomous branching at 45 degree angles.
- variable staining => use PAS or silver stain
- macrophage, mixed or pyogran inflam
Thompson VCNA 2017
What does dermatophytosis look like cytologically?
- spores 1-3um
- round
- thin clear capsule
- extracellular
- supprative inflam
Thompson VCNA 2017
What does mycobacterium appear like cytologically?
- non-staining, filamentous rods in macrophages
- gram +, acid fast
- marked pyogran inflam
Thompson VCNA 2017
What does neorickettsia helminthoeca look like cytologically?
- 1-2 um diameter,
- variable shaped
- basophilic inclusions in macrophages.
- granulomatous lymphadenitis
Thompson VCNA 2017
What does actinomyces/nocardia look like cytologically?
- long filamentous rods with a beaded appearance that often taper at the ends
- clumps/colonies with actinomyces (sulfur granules)
- pyogran inflam
Thompson VCNA 2017
What does Cytouxzoon felis look like cytologically?
- 1-2um
- round
- pinpoint, eccentrically located nucleas and clear cytoplasm
- in RBCs.
- Southeast and midwest USA
Thompson VCNA 2017
What does dirofilia immitis appear like on blood smear?
- 300um x 6um
- tapered head and a pointed tail.
Thompson VCNA
What does distemper look like cytologically?
- Viral inclusion
- cytoplasm
- rounded
- smooth or glassy appearance
- variable colour depending on stain
Thompson VCNA 2017
What are risk factors for bartonella in north america?
- intact male dogs
- co-exposure with other canine vector borne diseases
- mixed breed
*geography and time of year were not risks. seen throughout USA and in all seasons.
Lashnits JVIM 2018
What serovars of bartonella are most common in the USA?
b. koehlerae (2.39%) > b. henselae (2.14%) > b. visonii ssp berkhoffi (1.42%)
Lashnits JVIm 2018
What is the sensitivity and specificity of IFA testing for bartonella in dogs using expanded antigen panels?
Sensitivity 62%? but individual serovars ranged from 15-38%
Specificity 85%
neupane JVIM 2017
What is the cause of tick bourne relapsing fever in dogs?
How is it diagnosed?
what is the most common clinical sign?
Treatment?
- Spirochete bacteria - Borrelia turcatae or hemsii
via ornithodoros spp ticks - visulization of spirochets in blood smear
- thrombocytoepnia
- tetracyclines
Piccione JVIM 2016
For dogs with leptospirosis presenting with haematological abnormalities, what are the common changes?
Are there any prognostic factors associated with this?
- can be hyper, normla or hypocoagulable
- anaemia
- throbmocytopenis
- hyperfigrinogeniemia
- increased D-dimers
- DIC
Mortality rate lower in hypercoag dogs.
DIC did not affect prognosis
Bartelemy JVIM 2017
What test can be used for early detection of lepto specific antibodies?
at what time frame?
what antibody type?
Witness lepto test
detected in all dogs by day 10 compared to 30/32 by MAT by day 14.
IgM
Lizer JVIM 2018
what species of lepto is associated is chronic granulomatous hepatitis without clinical signs of renal involvement?
how is this confirmed?
do patients remain positive on repeat sampling?
Leptospira interrogans/kirschneri
- increase liver end, FISH on liver biopsy and PCR for species.
- 3/4 remained positive after doxycycline treatment.
McCallum JVIm 2018
What presentations can be seen with feline listeriosis?
What are the predilection sites?
- mesenteric lymphadenopathy
- systemic secondary to bacteraemia
- Mononuclear phagocytic tissues
- CNS
Fluen JVIM 2019
What age cats if feline mesenteric lymphadenitis secondary to listeria seen?
Treatment?
Prognosis?
- young to middle aged
- raw meat diet
treatment: amoxycillin
Prognosis: long survival
Fluen JVIm 2019
Which mycoplasma species is likely associated with LRT disease in dogs?
Which is more likely commensal?
Which is there insufficient data for?
LRT disease: M. cynos
Commensal: M. canis, M. spumans, m edwardii
Unclear: M. spumans.
Jambhekar JVIM 2018
Can M canis be transmitted vertically?
What about Ehrlichia ewingii?
M, canis: Yes
E. Wingii: No
What disease has probable REM sleep behaviour been associated with?
Are anti-epileptic medications effective?
What clinical signs are seen?
When does this generally occur after diagnosis?
Tetanus no Clinical signs includ: - running 80% - vocalization 60% - twitching 53% - seizure like 40% - nightmare like 36%
Usually within 2 weeks of discharge in >75% of cases.
Shea JVIm 2018