Chapter 7 - Viral and protozoal Flashcards
(167 cards)
1
Q
By which mechanisms does FeLV cause skin disease?
A
Oncogenesis and cytosuppression
2
Q
In FeLV associated giant cell dermatosis, on which anatomical site are lesions always found and what are the lesions?
A
Face and head +/- legs
Scaling, erosions, crusting
3
Q
Which viral protein can be stained for on histopathology?
A
gp70
4
Q
On histopathology, where do you see syncytial-type giant cells with FeLV?
A
In the epidermis and outer root sheath of hair follicles
5
Q
Which virus most commonly causes poxvirus infections in cats?
A
Cowpox (Orthopoxvirus)
6
Q
What are the reservoir hosts of cowpox virus?
A
Rodents - bank and field voles, wood mice
7
Q
What is the primary skin lesion of cowpox?
A
Single, ulcerated nodule on the head/neck or forelimbs
Cats that hunt rodents Concurrent viraemia (pyrexia, lethargy, anorexia)
8
Q
How long do cowpox skin lesions take to heal?
A
4-5 weeks
9
Q
Which disinfectant is cowpox particularly susceptible to?
A
Hypochlorite solutions
10
Q
What type of virus is canine distemper?
A
Paramyxovirus
11
Q
Which diseases appear clinically similar to canine distemper virus?
A
Leishmania, necrolytic migratory erythema, generic dog food disease
12
Q
What type of inclusion body, and in which cells, are seen with canine distemper virus?
A
Cytoplasmic inclusion bodies in keratinocytes
Often numerous
13
Q
What causes contagious viral pustular dermatitis?
A
Orf - parapoxvirus
14
Q
Which type of virus is pseudorabies?
A
alpha-herpesvirus
15
Q
Which species are the main reservior of infection for pseudorabies?
A
Pigs
16
Q
What are the cutaneous signs of feline herpesvirus infection?
A
Superficial, multiple ulcers at any body site OR ulcerative and nectrosing facial dermatitis
17
Q
Which finding on histopathology is unique to feline herpes virus infection?
A
Necrosis of epitrichal sweat glands.
18
Q
Are papillomaviruses species specific?
A
Yes - in dogs and cats
19
Q
Which layer of the epidermis do papillomaviruses infect?
A
The stratum basale but they need terminally differentiated keratinocytes for viral replication
20
Q
A keratinocyte with an enlarged nucleus, irregular nuclear membrane, increased nuclear staining and perinuclear halo is called what?
A
A koliocyte
21
Q
Which cells are important in the cell mediated immune response to canine oral papilloma virus?
A
CD4+
22
Q
Which breeds of dog are predisposed to exophytic cutaneous papillomas?
A
Kerry Blues, Cocker spaniels
23
Q
Which breeds of dog are predisposed to inverted cutaneous papillomas?
A
Beagles, Bernese Moutain dogs, Cocker spaniels, Great Danes, Irish setters, Kerry Blues, Whippets
24
Q
What can canine pigmented viral plaques transform to?
A
Squamous cell carcinomas
25
What causes Rocky Mountain spotted fever?
Rickettsia rickettsii
26
How is Rocky Mountain spotted fever transmitted?
Ticks - Dermoscentor andersoni/variabilis
27
Which tick is the vector for Ehrlichia canis?
Rhipicephalus sanguineus
28
Skin lesions occur in what % of dogs with visceral leishmaniasis?
80%
29
At which body sites are the lesions of exfoliate cutaneous leishmaniasis most pronounced?
Head, pinnae and extremities
30
Which histopathology stain aid identification of Leishmania amastigotes?
Giemsa
31
What changes can be seen on histopathology in papillomavirus infected keratinocytes in feline viral plaques?
Nuclear shrinkage
Perinuclear clearing (koilocytosis)
Increased quantities of blue-grey foamy cytoplasm
32
Which breeds of dog are reportedly predisposed to papillomavirus associated viral plaques?
Pugs and Min. Schnauzers
33
What changes can be seen on histopathology of canine papillomavirus associated viral plaques?
Papillary thickening of the epidermis
Hyperkeratosis
Hypermelanosis throughout the epidermis and superficial dermis
Large keratohyaline granules
34
Which are the oncogenic proteins of papillomavirus?
E5, E6 and E7
35
Pustular dermatitis at the site of a surgical wound following ovariectomy has been reported in 2 cats associated with which virus?
Calicivirus
36
What are the clinical (cutaneous and systemic) signs of FCV-associated virulent systemic disease?
- Subcutaneous oedema of the face and limbs and variable levels of ulceration of the skin, particularly on the pinnae, footpads, and nares
- Fever, anorexia, jaundice
37
Name two FeLV associated cutaneous syndromes
Cutaneous horn
| FeLV-associated giant cell dermatosis
38
Which type of papillomavirus is responsible for feline sarcoids?
BPV-14
39
What type of virus is a papillomavirus?
Papillomaviruses are non-enveloped, double-stranded DNA viruses.
40
What skin lesions have been reported in cats with FIP?
Papules/nodules
Pitting edema
Skin fragility
41
Which genus of sandflies are vectors for Leishmania?
Phlebotomus (Europe) and Lutzomyia
42
Which Leishmania species is reportedly most likely associated with visceral leishmaniasis in cats?
L. infantum (as in people)
43
What are the most common cutaneous clinical signs of leishmaniasis in cats?
- Nodules 72.7%
- Ulcers or crusts 36.4%
- Alopecia 9.1%
- Scaling 7.6%
The majority of animals showed only one dermatological sign (75.7%)
44
Which areas of the body are most commonly affected in cats with leishmaniasis?
Head 90.9% (nose 60.6%, ears 42.4% and eyelids 16.7% most commonly)
Legs 30.3%
45
In leishmaniasis, which toll-like receptor induces production of reactive oxygen species and reduces parasite growth when it binds parasite ligands?
TLR-4
46
What are the most common clinical signs of leishmaniasis in ferrets?
Enlargement of peripheral lymph nodes and skin lesions such as papular and/or ulcerative dermatitis
47
Domperidone is a dopamine D2 receptor antagonist that can potentiate the immune response through modulating the effect of what?
Prolactin
48
When treating leishmaniasis, increasing the production of prolactin induces a boost of T CD4+ lymphocytes, in addition to the release of cytokines such as?
IL-2 and IL-12, IFN-γ and TNF-α
| Producing an activation of NK cells and macrophages, followed by a decrease of CD4+ Th2 cytokines and TNF-β.
49
Which canine papillomavirus is most commonly associated with pigmented viral plaques?
CPV4
50
Has diarrhoea been reported as the only clinical manifestation of leishmaniasis in cats?
Yes - very rarely
51
A canine papilloma virus-like particle vaccine is made using which part of the papilloma virus?
L1
52
What are the six syndromes of canine papillomavirus infection?
1. Oral papillomas
2. Venereal papillomas
3. Exophytic cutaneous papillomas
4. Cutaneous inverted papillomas
5. Footpad papillomas
6. Pigmented viral plaques
Cutaneous horn also reported with CPV-1!
53
Gould et al. (2021); what was the median age of onset of canine footpad papillomas?
4 years
54
Gould et al. (2021); were canine footpad papillomas most common on haired skin of the digits or footpads?
Haired skin
55
Gould et al. (2021); most canine footpad papillomas resolved how many weeks after biopsy?
3 weeks
56
What are these lesions?
Inverted papilloma (raised erythematous nodules with a central keratinised core)
57
How do papilloma viruses invade skin and cause disease?
1. Microtrauma allows the PV to gain access to the basal cells.
2. Expression of E1 and E2 genes allows the virus to make a small number of copies of itself which then infect surrounding basal cells - persistent infection.
3. Replication is only possible when a basal cell terminally differentiates
4. Suprabasally, the expression of the E6 and E7 proteins interferes with cell regulation by preventing the terminally differentiation ensuring the nucleus is retained, and forcing the epithelial cells to divide and make copies of the PV
5. As the infected cells near the surface of the epithelium, the L1 and L2 proteins are expressed allowing the virion to be assembled.
6. Cells slough and degenerate releasing the viral particles into the environment
58
Most oral papillomas in dogs will spontaneous resolve in __ months
3
59
IHC detects which papilloma virus antigen?
L1 (capsid protein)
| Can also be used to detect increased p16 protein
60
Which feline papilloma virus is found in the oral cavity and what lesions does it cause?
FcaPV 1
| Appear to be restricted to the ventral surface of the tongue - clusters of exophytic lesions
61
Which feline papilloma virus is most common?
FcaPV 2 - majority are asymptomatic (most common PV in BISC)
62
What are the histopathological findings with FcaPV 2 infection?
1. Expansion of the cytoplasm with either non-staining material or with wispy, granular or amorphous blue-grey material
2. Unlike FcaPV types 1 and 3, FcaPV2 does not result in the development of any intracytoplasmic bodies.
3. Koliocytes
63
Which breeds of cats are predisposed to BISC?
Sphynx and Devon Rex
64
What are the histopath findings in BISC?
- Mild to moderate epidermal hyperplasia within the deeper layers of the epidermis
- No marked expansion of the stratum spinosum as in a viral papilloma
- Cells within the epidermis become disorganised and progress to intraepithelial neoplasia (do not breach BM)
65
Which protein is increased in papilloma-induced neoplasias?
Increased p16 due to the consistent PV-induced degradation of the retinoblastoma protein (pRb)
66
Are feline oral SCC PV induced?
No - no evidence to support an association
67
Do feline sarcoids typically require close contact with cattle
Yes - BPV14
68
Which canine papilloma viruses may be associated with SCC?
CPV 9, 15 and 16
| CPV 1 isolated from oral SCC
69
What are squamous papillomas?
Papillomas lacking the typical cytopathic effects seen with papilloma virus (viral aetiology has not been confirmed):
- dysplasia
- cytoplasmic vacuolation
- koilocytosis
- hypergranulosis (giant granules in SG)
- intranuclear inclusions
- blue-grey cytoplasm
70
Which canine papilloma virus is associated with oral papillomas?
CPV 1
71
Endophytic papillomas in dogs are most often associated with which papilloma virus?
CPV 2
72
What type of papillomatosis is this?
Footpad, exophytic
73
Canine papilloma, what are the arrows pointing at?
Intranuclear inclusion bodies
74
Which diseases are reportedly associated with papilloma virus in cats?
1. Viral plaque/BISC
2. Cutaneous SCC
3. Basal cell carcinoma
4. Oral papilloma
5. Feline sarcoid
75
What are the clinical signs of viral plauqes/BISC in cats?
- Aged 8 and 14 years
- Face, head and neck most common
- Lesions are often multiple and pigmented
- Can develop within pigmented or non-pigmented, haired or non-haired skin
- Viral plaques < 1 cm in diameter, slightly raised, hairless lesions covered in a thin crust
- BISCs larger and typically markedly raised ulcerated lesions covered by a significant serocellular crust or a thick layer of keratin
76
What type of papillomatosis is this?
BISC
77
Which treatments have been reported for canine papillomas?
1. L1 virus like particle vaccine
2. Surgery/cryosurgery/CO2 laser ablation
3. Imiquimod
4. IFN-alpha
5. Azithromycin
6. Tigilanol tiglate gel
7. Systemic retinoids
78
Which feline papilloma viruses have been associated with BISC?
FcaPV 2 (most common), 3, 4 and 5
79
Describe the papilloma virus induced keratinocyte changes in this image
Enlarged keratinocytes with increased amounts of blue, fibrillary material
Cells with shrunken nuclei surrounded by a clear halo (koliocytes) - arrows
80
What type of papilloma is this?
Inverted/endophytic
81
Which canine papilloma viruses are most commonly associated with cutaneous papillomas?
CPV-1, 2, 6 and 7
82
Have papilloma viruses been isolated from corns in Greyhounds?
Yes - CPV 12 and 16 from two dogs
| Balara et al. (2009) found no PV association with corns in 18 Greyhounds!
83
Azithromycin may speed resolution of oral and cutaneous papillomas in dogs within what time frame?
10-15 days of treatment
84
Antibodies are produced against which part of the papilloma virus?
L1
85
Which TLR is important for double-stranded DNA viruses like papilloma virus?
TLR 9
86
Which herpes virus is associated with ulcerative facial dermatitis in cats and what is it's structure?
FHV-1
| Double-stranded DNA virus
87
Where are skin lesions seen with FHV-1 infection?
Lesions are most common on the dorsal and lateral muzzle and periorbital area, but have also been reported on the extremities. Rarely reported on the pinna.
88
How pruritic is FHV-1 infection?
Variable - moderate to absent
89
Name three differentials for FHV-1 associated ulerative facial dermatitis
- Mosquito bite hypersensitivity
- Cutaneous adverse food reaction/FASS
- EGC
- Cowpox
- SCC
- PF
- Bacterial infections
90
What are the histopath findings in FHV-1 infection?
1. Full-thickness epidermal necrosis, often extending to adnexal structures and dermis.
2. Variably severe eosinophilic and neutrophilic infiltrate
3. Lightly basophilic intranuclear inclusion bodies with chromatin margination in intact epithelial cells adjacent to the necrotic areas (keratinocytes, follicular keratinocytes and sebocytes)
Predominant infiltration of mast cells and plasma cells has been reported.
91
Why is IHC preferable to PCR for FHV-1 detection on histopath?
IHC identifies a protein from the nuclear envelope regarded as indicative of viral transcription and assembly, implicating FHV-1 in the pathogenesis of the lesions
92
What is the structure of calicivirus?
Unenveloped, single-stranded RNA virus
93
What are the clinical signs of calicivirus infection?
Oral/nasal vesicles and ulcers, depression, pyrexia, sneezing and conjunctivitis.
Severe haemorrhagic and highly virulent type - facial and paw oedema, pyrexia, diarrhoea, ulcers on the lips, pinnae, nose, periocular skin and distal limbs.
94
What is the classical cutaneous manifestation of canine distemper?
Hard-pad; nasal and footpad hyperkeratosis (usually accompanied by systemic signs)
- the footpads are much harder to the touch than the degree of hyperkeratosis would suggest
95
Feline sarcoma virus is associated with which tumours?
Multicentric fibrosarcoma
Liposarcoma
Uveal melanoma
96
Why do feline sarcoma virus +ve cats also test positive for FeLV?
The FeSV virus is a true hybrid virus, resulting from the combination of FeLV pro-viral particles with parts of the infected cat genome, specifically proto-oncogenes
97
At what age are cats typically infected with feline sarcoma virus and what is the prognosis?
Young - extremely poor
98
Apart from FeLV-associated giant cell dermatosis, which other skin disease is it associated with in cats?
Cutaneous horn
99
What unusual manifestation of cowpox virus has been reported in cats?
- Lameness and skin lesions affecting hindlimbs consisting of severe oedematous, hyperaemic swellings often with plaque-like lesions or erosions.
- Large areas of focal dermal necrosis (eschars) and/or extensive erythema and oedema
100
Which drugs can be used to treat feline herpes virus infection?
1. Famciclovir, L-lysine (controversial efficacy), acyclovir, gancyclovir, cidofovir
2. Human IFN-a
3. Recombinant fel IFN-ω
4. Imiquimod?
101
What role do IFN-gamma and TNF-alpha have in the immune response to Leishmania?
They recruit and activate macrophages to kill Leishmania through phagocytosis and release of radical oxygen species
102
What % of feline leishmaniasis cases were coinfected with FIV or FeLV?
FIV 12.1%
| FeLV 9.1%
103
Do most cases of feline leishmaniasis present with skin lesions?
Yes in > 50% of cases
104
Cytology diagnosed feline leishmaniasis in what % of cases?
94% (FNA or impression)
105
In feline leishmaniasis, histology was diagnostic for the presence of Leishmania amastigotes in what % of cases?
62% (without IHC/PCR)
106
Which treatments were most often used to treat feline leishmaniasis?
Allopurinol for at least 6 months +/- meglumine antimoniate for 30 days
Surgery
107
What is the suggested approach to diagnose leishmaniasis in cats presenting with alopecia/scaling?
1. Wood's lamp, trichography, skin scrapings, fungal culture
2. Biopsy for histopathology
3. IHC/qPCR if amastigotes are not visible
108
What should be monitored in cats receiving allopurinol?
Urinalysis and kidney ultrasound
| Reversible skin reactions have also been reported
109
Are infected cats capable of transmitting L. infantum to sandflies?
Yes
110
Do you see spontaneous remission in cats with leishmaniasis?
Yes
111
In dogs leishmaniosis is a chronic and progressive disease which affects all tissues and organs, which organs are typically affected in cats?
- Spleen, liver, lymph nodes, bone marrow, kidney, eyes, skin and mucous membranes
- Skin > ocular and oral > others
112
What is the most common biochemical finding in cats with leishmaniasis?
Hypergammaglobulinaemia
| Proteinuria and non-regenerative anaemia are less common findings in cats
113
What is the IFAT cut off for leishmaniasis in dogs and cats?
1:80
114
_________ impregnated collars are the only pyrethroid formulation licensed for use in cats that has been demonstrated to reduce the incidence of L. infantum in cats
Flumethrin
115
How frequently should quantitative serology be performed when monitoring dogs and cats after treatment for leishmaniasis?
Every 3-6 months
116
What does this image show?
Leishmania infantum amastigotes in a macrophage
117
Which non-vector routes of transmission of Leishmania have been reported in dogs?
1. Sexual
2. Vertical
3. Blood transfusion
118
What are the cutaneous signs of leishmaniasis in dogs?
1. Non-pruritic exfoliative dermatitis with or without alopecia
2. Erosive-ulcerative dermatitis or stomatitis
3. Nodular dermatitis
4. Papular dermatitis (eg sites of sand fly bites)
5. Pustular dermatitis (rare - possible drug reaction/PF?)
6. Onychogryphosis
7. Vasculitis
8. Nasal and digital hyperkeratosis
9. Nasal and oral depigmentation
10. Mucosal proliferations on the penis, tongue, nose and orally
119
What are the general signs of leishmaniasis in dogs?
1. Generalized lymphadenomegaly
2. Weight loss
3. Decreased or increased appetite
4. Lethargy
5. Mucous membranes pallor
6. Splenomegaly
7. Polyuria and polydipsia
8. Fever
9. Vomiting and diarrhoea
120
What are the ocular signs of leishmaniasis in dogs?
1. Blepharitis (exfoliative, ulcerative or nodular) and conjunctivitis (nodular)
2. Keratoconjunctivitis, either common or sicca
3. Anterior uveitis
4. Endophtalmitis
121
What biochemical changes are seen with leishmaniasis in dogs?
1. Hyperproteinemia
2. Hyperglobulinemia (polyclonal beta and/or gammaglobulinemia)
3. Hypoalbuminemia
4. Decreased albumin/globulin ratio
5. Renal azotemia
6. Elevated liver enzyme activities
7. Proteinuria
122
What samples and techniques should be used for Leishmania PCR?
First choice: bone marrow, lymph node, spleen, skin or conjunctival swabs.
The sensitivity of the PCR assay is lower when performed on blood, buffy coat and urine.
Most sensitive technique: real-time/quantitative PCR.
123
How long do you treat dogs with allopurinol for leishmaniasis?
6-12 months
| 10mg/kg
124
Which drugs should allopurinol be used in combination with to treat canine leishmaniasis?
```
Meglumine antimoniate (4-6 weeks)
Miltefosine (28 days)
```
125
Which products have proven efficacy for repelling sand flies in dogs and when should they be started?
1. Permethrin spot-on may provide a repellent (anti-feeding) activity for 3-4 weeks (at least 48 hours before exposure)
2. Deltamethrin-impregnated collars: duration of efficacy is up to 12 months.
3. Flumethrin-containing collar,: duration of up to 8 months.
All the collars should be applied at least 1-2 weeks before exposure
126
Which dogs can be vaccinated against Leishmania?
Healthy, quantitatively seronegative dogs of 6 months of age or older
127
The vaccine for Leishmania available in Europe is based on which protein and what is its efficacy?
Q-protein
| 72%
128
Does vaccination against Leishmania affect Ab IFAT/ELISA testing?
IFAT = immunofluorescence antibody test
No
129
Is there a seasonal variation in anti-Leishmania Ab in dogs?
Yes - associated with sand fly seasonality
- 44% of clinically healthy seropositive dogs became seronegative in the non-transmission season (this could be due to cell-mediated immune response!)
130
What is the sensitivity and specificity of the IFAT for the diagnosis of canine leishmaniasis?
Sens: 96%
Spec: 98%
131
Which type of immune response is associated with resistance to Leishmania?
A robust Th1 immune response:
- production of pro-inflammatory cytokines e.g. IFN-γ and TNF-α which limit infection by increasing the leishmanicidal activity of macrophages.
132
Which type of immune response is associated with susceptibility to Leishmania?
Th2 cells, regulatory T-cells and regulatory B cells:
- cytokines released by Th2 cells e.g. IL-4 and IL-13 and the activity of Tregs and regulatory B cells via IL-10, downregulates the protective Th1 immune response
- promotes “inappropriate” humoral immune responses
- induces the formation of circulating immune complexes (Leishmania antigen, IgG and complement protein C3)
133
In dogs with leishmaniasis, do circulating immune complex levels correlate with disease severity?
Yes
134
How does L. infantum counteract the killing effects of reactive oxygen species and promote parasite growth within marcophages?
By producing antioxidants such as superoxide dismutase
135
Is T cell exhaustion a factor in clinical disease with Leishmania?
Yes
136
Do wild animals pose a significant risk of infection with Leishmania to people?
In most cases there is no close contact between wild animals and humans or pets and, as sand flies do not travel long distances, significant transmission is unlikely.
137
What are the criteria for reservoir hosts e.g. for Leishmania?
1. The reservoir must be abundant and long-lived
2. An intense host-vector (sand fly) contact is necessary
3. Parasite (Leishmania) prevalence in the reservoir host should be higher than 20 %
4. The infection should be non-pathogenic and long enough
5. The parasite should be available in the blood or skin
138
Do acute phase proteins correlate with disease severity in dogs with leishmaniasis?
Yes - Dogs in the more advanced stages of Leishvet and CWLG classifications had significant increases in serum ferritin and C-reactive protein (CRP) and decrease in Paraoxonase1 (PON1).
139
Which is the most successful preventative strategy for canine leishmaniasis?
1. Repellents
| 2. Domperidone may provide additional protection (low numbers in Fernadez et al.)
140
Did vaccination result in a significantly lower incidence of leishmaniasis compared to not applying any measure?
No - incidence of 10.1% with vaccination vs. 12.5% with no intervention
141
What are the sero-prevalence and PCR-prevalence of Leishmania in cats in Italy?
Sero-prevalence (24 %) and PCR prevalence (21 %)
142
Does treatment of leishmaniasis lead to parasitological cure?
Very difficult - usually only clinical remission
143
What are the four stages of clinical leishmaniasis?
1. Mild: Negative to low positive Leishmania titer, mild skin disease, lymphadenopathy, normal labwork: Prognosis good.
2. Moderate: Moderate skin disease, lymphadenopathy, weight loss, fever, anemia, hyperglobulinemia Low to high Leishmania antibody titer, hypoalbuminemia, no to mild proteinuria with no azotemia. Prognosis good to guarded.
3. Severe: Medium to high Leishmania antibody titer, Stage I and II signs + renal disease. Prognosis guarded to poor.
4. Very severe: Medium to high Leishmania antibody titer, Stage III signs + pulmonary thromboembolic disease and/or nephrotic syndrome/end stage renal disease with marked proteinuria. Prognosis poor.
144
How do you treat the four stages of clinical leishmaniasis in dogs?
Stage 1: Treat with allopurinol +/− miltefosine or meglumine.
Stage 2: Treat with allopurinol + meglumine antimoniate (treatment of choice) or miltefosine
Stage 3: Treat with allopurinol + meglumine antimoniate (treatment of choice) or miltefosine
Stage 4: Treat palliatively with allopurinol alone and follow IRIS guidelines for renal failure treatment, euthanasia based on quality of life.
145
In canine babesiosis, skin lesions are rare and include oedema, ecchymosis, ulceration and necrosis. What type pathology causes these lesions?
Subjacent leukocytoclastic vasculitis with or without vascular necrosis
146
In canine babesiosis, where can cutaneous lesions be found?
Pinnae, axillae, groin, limbs or scrotum
147
What are the cutaneous clinical signs of canine neosporosis?
Widespread draining nodules or rapidly spreading ulcerative dermatitis of the eyelids, neck, thorax and perineum have been reported.
148
On histopathology, where can Neospora tachyzoites be found?
Within keratinocytes, macrophages, neutrophils and rarely endothelial cells
149
How do you differentiate Neospora from Toxoplasma on histopathology?
IHC, ultrastructural or PCR studies
150
What are the cutaneous signs of toxoplasmosis in dogs and cats?
Occasionally causes ulcerative skin lesions in dogs and cats. Lymphadenopathy is common
151
What are the histopath findings of cutaneous toxoplasmosis?
Pyogranulomatous or necrotizing dermatitis and vasculitis with Toxoplasma organisms
152
How do you treat toxoplasmosis?
Clindamycin 10mg/kg PO TID × 4 weeks
153
What are the cutaneous signs of ehrlichiosis?
Skin lesions in dogs can include petechiae/ecchymoses due to thrombocytopenia, and rarely crusting on the dorsal muzzle or a pruritic papulocrustous dermatitis. Lymphadenopathy is common.
154
How do you diagnose ehrlichiosis?
Ehrlichia serology: IgG>1 : 80 (15days post infection).
| Ehrlichia PCR
155
How do you treat ehrlichiosis?
Doxycycline 10mg/kg/day × 3–4weeks
| Tetracycline 22–30mg/kg PO or IV TID × 3–4weeks.
156
What cutaneous signs can be seen with FIV infection?
- Chronic abscesses
- Increased risk of infections
- Generalised papulocrusting eruption with alopecia and scaling (not pruritic - interface dermatitis)
- A severe form of mucinous degenerative mural folliculitis
157
Which form of Leishmania is transmitted by sand fly vectors?
Proamastigote (flagellate)
158
Leishmaniasis is seen in what age of dog?
2-4 years and >7 years (associated with underlying disease)
159
Which breeds of dog are more often affected by leishmaniasis?
Rottweiler, GSD, Boxer
160
Which breed of dog is resistant to leishmaniasis?
Ibizan Hound
161
What is the incubation time of Leishmania?
4 months to 7 years
162
What % of dogs in endemic areas are seropositive for Leishmania?
Up to 40%
163
Which cytokines are associated with a Th2 immune response to Leishmania?
IL4, IL5, IL6 and IL10
164
Which cytokines are associated with a cell mediated response to Leishmania?
IFN gamma, TNF alpha IL2 and IL12
165
What % of dogs with leishmaniasis show symmetrical alopecia and dry exfoliation?
60%
166
Why don't you find amastigotes easily in areas of ulceration or vasculitis due to Leishmania?
Vasculitis is the result of circulating immune complexes and not direct presence of Leishmania
167
Which non-invasive test can detect early positivity in leishmaniasis?
Conjunctival swabs
