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176 Cards in this Set

  • Front
  • Back
keratitis
inflamm of the cornea
blepharitis
inflamm of the eyelid
chemosis
edema of the conjunctiva
dacryocystitis
inflamm of the nasolacrimal duct
tear film
IgA, lysozyme, lactoferrin, defensins
superficial ocular infections
conjunctivitis, keratitis and/or blepharitis. usually caused by commensals or environmental organmisms combined with predisposing factors. SOME (chlamydophilia, moraxella and herpesvirus infections) are contagious.
endophthalmitis
inflamm inside the globe
panophthalmitis
inflamm of all layers of the eye from sclera inward
deep ocular infections
anterior uveitis and/or chorioretinitis. Infectious and noninfectious causes. Infectious suually result of systemic infections or immune mediated reactions to infectious agents
bacterial causes of deep ocular dz in dogs
brucellosis, leptospirosis
rickettsial causes of deep ocular dz in dogs
ehrlichiosis, RMSF
mycotic causes of deep ocular dz in dogs
blasto, histo, coccidioidomycosis, cryptococcosis
viral causes of deep ocular dz in dogs
distemper virus, adenovirus1 (infectious canine hepatitis/blue eye)
other causes of deep ocular dz in dogs
prototheca spp
causes of conjunctivitis in cats
bacterial - chalmydophila felis, mycosplasma felis. Viral - feline viral rhinotracheitis virus
causes of enophthalmitits in cats
mycotic - histo, cryptococcosis. Viral - feline infectious peritonitis virus, feline leukemia virus, FIV
causes of ocular dz in horses
leptospirosis (periodic opthalmia / moon blindness), equine viral arteritis, aspergillus spp
causes of ocular dz in cattle
bacterial - infectious bovine keratoconjunctivitis (moraxella bovis), mycoplasma bovoculi, mycoplasma bovirhinis. Viral - infectious bovine rhinotracheitis, malignant catarrhal fever
causes of ocular dz in sheep/goats
chlamydophila pecorum, mycoplasma conhunctivae
causes of ocular dz in swine
atrophic rhinitis, hog cholara (FAD)
infectious bovine keratoconjunctivtis
pinkeye. Caused by moraxella bovis. Reservoir = ocular/nasal mm of carrier cattle. Direct transmission or mechanical vector (fly, gnat)
moraxella bovis
gram neg diplobacillus. B hemolytic, causes erosions and "pitting" of agar
early signs of infectious bovine keratoconjunctivitis
lacrimation, central corneal ulcer, chemosis
predisposing factors of infectious bovine keratoconjunctivitis
predisposing factors - UV light, wind, dust, tall/dry grass, insects. Viruses, mycoplasmas.
bacterial virulence factors
pili- colonization of conjunctiva and corneal epithelium. Exotoxins - hemolysin, collagenase, and hyaluronidase cause erosions and ulcers of epithelium of cornea
sequele of chronic, severe, deep ulcerative keratitis
descemetocoele - cornea erodes to expose descemet's membrane
treating IBK
tetracyclien. Topical Abs, if subconjunctival - penicllin
is there a vaccination for IBK?
yes. Protection is assoc with ab to pilus ag. However, ag diversity means vaccines will not protect against all strains. Efficacy debated - use as part of control progaram
is IBK zoonotic?
NO. moraxella bovis is host adapted to cattle.
infectious feline conjunctivitis
caused by feline herpesvirus-1 or chlamydophila felis
feline herpesvirus 1 / feline viral rhinotracheitis causes
conjunctivitis, keratitis, and nasooropharyngeal infection
chlamydophila felis causes
conjunctivitis
how cayou differentiate the two causative agents of infectious feline conjunctivtis
culture, stains or PCR. However, fhv often causes more severe dz
upper respiratory disease complex in cats
chlamydophila felis, feline herpesvirus, feline calicivirus, bordetella bronchiseptica.
chlamydia and chalmydophila spp
nonmotile acteria with a gram neg type cell wall. Obligate intracellular bacteria. Multiply within a membrane - bound vacuole inside host cells.
chlamydophila felis pathogenesis
intial signs 5wks - 9mo of age. Transmission - direct contact with discharge from carrier cats. 3-5 d incubation.
generalized infection with c. felis
Generalized infection - kitens at parturition/neonatal period, agent in GI and genital tract.
clinical signs of c felis infection
serous nasal discharge, blepharospasm, chemosis, conjunctival hyperemia. Signs resolve in 3-4 weeks, but persistent infections are possible (Sbuclinical with period clin signs)
diagnosins c felis
conjunctival swabs - large cytoplasmic inclusions, culture, ELISA, pcr. Serology - high titers = active infection
treating c felis
topical AND systmic tetracyclines. Treat at least 4 weeks / 2 weeks after signs resolve. Treat all cats in houseold. Attenuated vaccine available but will not prevent infection
is c felis zoonotic
yes, but rare. Several cases of human conjunctivtis have been reported
bacterial cystitis
common, esp in dogs. Bacteria involved are commensals and/or opportunisitc. 40% are e.coli. Proteus sp, klebsiella sp, pseudomonas sp, enterobacter sp.
predisposing factors of bacterial cystits
urinary obstruction, anatomical defects, imcomplete emptying of bladder, urolithiasis, neoplasia, compromised immunity
preferred method of sample collection
cystocentesis
contagious bovine pyelonephritis
caows. Corynebacterium renale group. C. renale is most frequent cause of dz. Also c. pilosum and c. cystiditis. Gram posiive club shaped rods
pathogenesis of contagious bovine pyelonephritis
organism may be found as lower urogenital tract flora of males and may become established in females. Can be transmitted venereally, from cow to cow via urine, and iatrogenically via fomites. Development of pyelonephritis is assoc with parturition and oother predisposing factors. most common in mature cows 1/4 to 1/3 of cases are fatal.
corynbacterium pilosum
least virulent, found in healthy cows
corynbacterium cystitidis
most irulent, never found in healthy cows but is a commensal of the male prepuce
clinical signs of bovine pyelonephritis
dysuria, pollakiuria, may have hematuria/pyuria. Anorexia, fever and epression as pyelonephritis progresses
diagnosins contagious bovine pyelonephritis
clin signs, palpation, U/s, urinalysis, gram stain of urine (With gram pos rods). Urine culture
treating contagious bovine pyelonephritis
penicillin or TMS. Extra label dosages recommended.
contagious cystitis or pyelonephritis of sows
actinobaculum suis
actinobaculum suis
gram pos anaerobic rod. Major means of transmission is from inapparent carrier boars (prepuce) to sows at breeding
predisposing factors of contagious cystitis / pyelonephritis of sows
trauma at breeding, increased ph at estrus favoring replication of the agent, inadequate water supply predisposes to dz.
when do most cases of contagious cystitis /pyelonephritis occur?
3-4 weeks post breeding
clinical signs and diagnosis
sudden death, hematuria and dysuria. UA - proteinuria, hematuria, pyuria, bacteriuria. Azotemia. Demonstrate etiologic agent- anaerobic cultre, FAT
treating contagious cystitis /pyelonephritis of sows
penicillins. Control - reduce trauma at breeding, prophy ab at breeding, AI
spirochetes
slender, helically coiled gram neg bacteria. Motile via periplasmic flagella
genus leptospira
2 serologic species - leptospira interrogans (pathogenic) and leptispira biflexa (Saprophytic). Then reclassified based on genetic relatedness- now 17 species, 250+ serovars.
genetic leptospiral species of vet importance
L. interrogans, L kirschneri, and L borgpetersenii
leptospira serovars of vet importance
L. canicola, l hardjo, l pomona, l grippotyphosa, l icterohemorrhagiae, l bratislava
leptospira reservoir
mammals, domestic and wild, dependeing on serovar. Rodents often implicated
leptospira transmission
extreted in urine of infected animals - clinically ill and carrier (milder signs, long term shedders). Direct transmission - mm r abraded skin contact with contaminated urine. Transplacental. Venereal. Indirect - contaminated water.
L canicola reservoir
dogs and wild canidae
l icterohemorrhagiae reservoir
rats
l pomona reservoir
pigs and cattle
l grippotyphosa reservoir
skunk, opossum raccoon, vole, other rodents
l hardjo reservoir
bovine, ovine, cervidae
l bratislava reservoir
swine, hedgehogs, horses
wild mammals can serve as incidental hosts for all serovars EXCEPT
L hardjo
pathogenesis of leptospirosis
exposure via contamianted water, urine or infected tissue. Penetration through intact mucous membranes. Leptospiremia (lasts days to 1 week) and vasculitis. Infection of LIVER, KIDNEY, LUNGS, spleen, cns, eyes and/or genital tract. Development of ab results of disappearance of leptospires from blood, but may persist in renal tubules for months
acute intravascular hemolysis
seen in young calves with L pomona infections. Hemoglobinuria, anemia, icterus. High mortality
bovine leptospirosis abortion
last trimester. 1-4 weeks following leptospiremia which is usually sublicnical. L Pomona most common. Infertility/early abortions assoc with L hardjo infections.
bovine leptospirosis agalactiae
sudden drop in milk prod with no signs of mastitis. Assoc with L hardjo infections
porcine leptospirosis
acute rarely seen. Abortion during last 2-4 weeks of gestation is major clinical sign. L pomona, L icterohemorrhagiae
ovine leptospirosis
not common, usually l pomona. Similar to bovine - acute hemolysis in young lambs, abortion in ewes.. L hardjo maintenace host
equine leptospirosis
L pomona / l bratislava (maint host). 1) acute renal failure -rare. 2) abortion near end of gestation. 3) stillbirths or weak, anemia, icteric foals 4) equine recurrent uveitis / periodic ophthalmia / moon blindness. L Pomona, months to years after initial infection. immune mediated??
canine leptospirosis
common canine serovars: L interrogans gripptyphosa, L pomona, L icterohemorrhagiae, L canicola (maint host). Adult hunting dogs, late summer/fall. Clin signs - lethargy, depress, fever, anorexia, myalgia, vomiting, TCP, icterus, renomegaly, hepatomegaly, ab/lumbar pain, diarrhea, ARF - azotemia, oliguria, anuria
acute leptospirosis
vasculitis, DIC poss. 1) renal failure -L gripptyphosa, L canicola 2) liver damage - L icterohamorrhagiae or L pomona. Chronic acrive hepatis may be sequela of L grippotyphosa infection. Many animals subclinically infected, dz more severe in younger animals
diagnosins lepto
clinical signs, demo of organism (FAT on kidney is best). Dark field microscopy on urine - low sensitivity. Culture - confirmatory. Serology - most common. PCR
canine lepto tx
penicillin to elim leptospiremia followed by doxy x 2 weeks to elim shedding
LA lepto tx
tetracyclines x 2 weeks
is there a lepto vaccine avail for dogs? Cattle?
yes, and yes. May not always prevent infection or shedding
lepto zoonotic potential
causes mild to severe symptoms- flu like illness that may progress to icterus, renal or hepatic failure, or pulm hemorrhage. Dz names: swine herders, weil's, canicola fever
brucellosis
chronic dz involving mainly the repro tract of animals result ing abortion/infertility. Caused by genus brucella - small gram neg aerobic coccobacilli. Obligate parasites of animals, facultative intracellular bacteria
brucella abortus
cattle, abortion
brucella suis
swine, abortion
brucella melitensis
sheep,goats, abortion
brucella canis
dogs - epidydmitis, abortion
brucella ovis
sheep - ram epididymitis, rare abotion
smooth brucella
long polyvalent O side chains, will cross react with each other on agglut tests. B abortus, suis, melitensis. More virulent
rough brucella
short or absent polyvalent o side chains, will cros react with one another. B canis / ovis.
do rough and smooth brucellas cross react?
no
brucalla general pathogenesis
entry through skin/mucosa. Transport to and replication in local lymph nodes. Ability to survive and replicate inside macrophages. Prevent phago-lysosome fusion. Travel to LN, spread to other tissues esp repro tract
erythritol
found in allantoic fluid, stimulates growth of brucellae
how does brucella cause abortions?
infection of endometrium -> cotyledon -> necros and edema -> Fetal infection or abortion
which species of brucella can be transmitted through aborted fetuses and uterine dischargges?
b abortus, b canis, b suis, b melitensis
which species of brucella can be transmitted through milk?
b abortus, b melitensis
which species of brucella can be transmitted via semen?
b canis, b suis, b ovis
which species of brucella can be transmitted from urine
b canis, b suis
what is used for the diagnosis of brucellosis?
antibodies
what is important in immunity to brucellosis and why?
CMI is important because of intramacrophage existence
diagnosins brucellosis
isolation/culture is definitive. Or direct exam on aborted fetuses (lung / stomach content). Serology is how most diagnoses are acquired
bovine brucellosis
brucella abortus. Res= cattle, bison, elk.
what can brucella abortus cause in horses?
fistulous withers and poll evil
diagnosing bovine brucellosis
abortions >5 mo gestation. Bulls - epiididymitis, orchitis, seminal vesiculitus. Culture - definitive - placenta, fetal stomach contents. Serology.
federal state coop program for brucellosis eradication
surveillance - dairy cattle ring test, market testing (card test.) vaccinated - attenuated. Strain 19 or RB 51. indemnity - monies paid for brucellosis reactors
swine brucellosis
brucella suis. Res = swine, both domestic and feral. Abortion is main clinical sign. Orchitis or arthrtis may be seen. Test and slaughter. NO VACCINE
brucella melitensis
FAD. Reservoir = sheep and goats. Most pathogenic to humans
brucella ovis
cause of contagious epididymitis in rams. Clinic sign = epidydmal swelling and decreased fertility in ADULT rams. Rough brucella, very host specific. Abortions rare. Transmited ram to ram via semen, or passive transfer via ewes during same estrus (ram to ewe to ram). causes flock infertility
epididymal swelling in young ram
non contagious epididymitis agents - actinobacillus actinomycetemcomitans, histophils somni. REPORTABLE.
diagnosing ovine brucellosis
culture - semen samples, testicles. Serology.
control and prevention of ovine brucellosis
cull positives in adult rams (palpations, serology). Separate older rams from younger to prevent transmission. Killed bacterin vaccine- may decrease clin signs and interfere with sero tests
canine brucellosis
brucella canis, a rough brucella. Dogs = res. Human infections have occurred. Clin signs - not generally ill, poss lymphadenopathy, low grade bactermia for 3 years. Repro abnormalities - abortion in last 2 weeks of preg, epididymitis/orchitis, infertility. diskospondylitis, glomerulonephritis, anterior uveitis, endophthalmitis
diagnosing canine brucellosis
serology - rapid slide agglut test - screening test, interpret cautiously, high false positive rate. Culture = definitive.
canine brucellosis treatment
Controversal. Different to determine infected status after therapy. ONLY TX NEUTERED ANIMALS. Doxy with aminoglycoside x4weeks
controlling brucellosis in breeding kenel
quarentine, allow no breeding. Confirm DX. Serotest all dogs - cull postives. Serotest at monthly intervals until 3 neg tests achieved for all dogs. Only allow entry of seroneg animals
marine mammal brucellosis
dolphins, seals, otters, walruses, whales. Pathogencitiy unknown. Considered opportunists. B ceti (cetaceans) and b pinnipedialis (Seals and sea lions)
brucella zoonotic potential
YES. Undulant fever in humans, aka malta/mediterranean fever. Intermittent fle like signs, fever, joint pain myalgia. May persist for years. Tx not always successful. Virulence: melitensis > abortus and suis > canis. REPORTABLE>
if you are exposed to brucellosis
titer ASAP, tx for 2-4 weeks. 4 weeks later- repeat titer.
chlamydophila forms
obligate intracellular bacteria - infectious particle : elementary body. Small dense cell with rigid cell wall. Extracellular form. Environmentally resistant. Binds to and enters host cell. Reproductive/reticulate body - intracelluar form, larger, metabolically active cell that begins replication in host cell
chlamydophila life cycle
EB attaches to host cell and initaiates endocytosis. EB within phagosome inhibits lysosome fusion with phagosome. Chlamydia have lost their ability to produce energy and use ATP from host. Binary fission with phagosome. Cells produced by binary fission develop into EB which are released by cell lysis / exocytosis
chlamydophila pathogesnsis
dz syndromes related to the infecting chlamydial sp and strain as well as host species. Chronic or persistent infections wihtout clinical signs are common. Some infections may be latent. Active infections sometimes stress related
chlamydophila psittaci
psittacosis in birds
chlamydophila felis
feline conjunctivitis
chlamydophila pecorum
koala repro and UT dz. Rums/swine- abortion, conjunctivitis, encephalomyeltis, enteritis, pneumonia and polyarthrtis. C abortus - ruminants, abortion!
chlamydial abortion / enzootic abortion of ewes
chlamydophila abortus. Abortuions in last 30 days, still births, weak lambs at birth. Also causes abortion in goats. Transmission via exposure to placenta or uterine fluids from an aborting ewe. Ewes exposed furing last month of gestation will abort the following year. placentitis is major lesion
diagnosis enzootic abortion of ewes
direct exam - cotyledon smears look for intracycoplasmic inclusions. Culture, serology (acute and convalescent titers- titers rise after abortion)
EAE tx
tetracyclines to control abortions - will not prevent infection or clea carrier animal. Reduce exposure. Bacterin vaccine - will prevent or decrease incidence of abortion
zoonotic potential of chlamydophila abortus
illness/abortions in humans. Warning to pregnant women
other abortifacient agents assoc with lambing
listeria monocytogens, toxoplasma gondii, campylobacter fetus
campylobacter spp
gram neg motile curved rods. Carrier animals are reservoirs.
which campylobacter species cause abortions or infertility?
c fetus venerealis, c fetus fetus, c jejuni
campylobacter fetus venerealis
etiologic agent of bov campylobacteriosis or vibriosis. Cause of temp infertility in cows and heifers. Occasional abortions
epidemiology of c fetus venerealis
obligate inhabitant of bov repro tract. Venereal transmissio. Bull is inapparent carrier - preputial crypes. Bulls <4 yr can be transient infected.
pathogenesis of campylobacteriosis
female - infection of vagina and cervix at breedign followed in 1 week by infection of uterus and oviducts. Mucopurulent endometritis. Infertility from 3-5 mo duration. Abortions at up to 8 mo gestation occur sporadically. Long duration of infection - due to Ag variation of bacteria. campylobacter cleared from uterus first (igg and iga) and then lower repro tract (iga). 1/3 females remain carriers that can infect bulls. natural immunity lasts 4 years
virulence factors of veneral campylobacters
microcapsule (s layer) made up of a protein lattice- there are 8 different ag variants of s layer. Other VFs: cytolethal distending toxin, outer membrane protein adhesins, endotoxin.
clin sings of campylobacteriosis
recently infected herd - repeat breeding, long estrous cycles, long calving season, cows calving late. Resolves after 2-3 breeding seasons. Chronicaly infected herd - only heifers and replacement cows show clin signs
dx campylobacteriosis
culture - cervicovaginal mucus, preputial smegma/washes, aborted fetus. Direct exam / gran stain of stomach contents of aborted fetus. Serology (Reliability?)
tx campylobacteriosis
not usulaly treated. Young bull may be txed with dihydrostreptomycin
control campylobacteriosis
vaccination - annual as control measure, prior to start of breeding seasing. Use AI
c fetus fetus
epizootic ovine abortion. May cause sporadic abortion in cattle. Inhab of gi tract / gall bladder of carrier animals. Transmission: Fecal oral, exposure to aborted fetus and dischartes. When ewes confined- abortion rate may reach 70%
c fetus fetus pathogenesis
organism is ingested and invades the intestinal mucosa. Bacteremia occurs and in preg animals invasion of the placenta and the fetus follows - placentntis, may see liver lesions in aborted fetuses
c fetus fetus clin signs
abortion in last 6 weeks of preg, stillbirths, premature lambs. Occasional ewe ill prior to abortion - fever, depression, diarrhea, vaginal discharge. Cattle- sporadic last trimester abortion
c fetus fetus diagnosis
direct exam - abomasal contents of fetus. Culture - ALWAYS culture cattle to differentiate
c fetus fetus tx and control
Ab (ewes that have aborted and pregnant ewes), bacterin vaccine. Mgmt- isolate, disposal.
c. jejuni
abortiona analogous to c fetus fetus.
vibrio vaccines for sheep
contain both c fetus fetus and c jejuni strains
zoonotic potential of campylobacter spp
c jejuni = zoonotic. C fetus fetus infections uncommon in humans.
what is the etiology of Q fever
coxiella burnetii
coxiella burnetti
obligate intracellular gram neg rickettsial bacterium that has two forms - metabolically active intracellcular form and inacive evironmentally resistant extracellular form
most common signs of Q fever
subclinical infection, abortion, infertility
animals most commonly affected by Q fever
sheep
how is coxiella burnetti shed
urine, milk, feces and parturient discharges
q fever transmission
aerosol (most common), tick, milk, vertical transmission
is q fever a zoonoses?
yes. Humans usually infected via inhalation of infective bacteria. Clin signs = fevers and myalgia. Signs vary and may include vasculitis, pneumonia, hepatitis or meningoencephalitis. Chronic form is endocarditis
etiology of contagious equine metritis
taylorella equigenitalis
taylorella equigenitalis
gram neg coccobacillus
what is CEM
a highly contagious venearl dz of horsess characterized by a copious mucopurlent vaginal discharge and temp infertility in mares
how is CEM transmitted
stallions are inapparent carriers- transmit during breeding
diagnosing contagious equine metritis
culture (Difficult), serology (not for infected stallions /chronic carriers - MAY detect acutely infected mares).
what should you do if CEM is suspected?
call state vet - FAD
CEM sequela
quarentine infected premises. No protective immunity - may become reinfected. Foals- infected at parturtion, test prior to 3 mo of age.
CEM treatment
genital lavage, local Ab therapy. Consider clitorectomy in chronically infected mares
most common species involved in bovine mycotic abortion
aspergillus spp - zygomycotic fungi
how does bovine mycotic abortion infections occur?
hematogenously from inahlation or ingestion of fungal spores
clinical signs of bovine mycotic abortion
near term, sporadic abortions, placentitis. Fetus - bronchopneumonia, circumscribed skin lesions
what is bovine mycotic abortion assoc with
indoor housing and moldy feed
equine mycotic abortion
aspergillus fumigatus. Ascending infection from the lower repro tract resulting in an intial localized placentis that becomes more invasive during the pregnancy
clincal signs of equine mycotic abortion
sporadic abortions during last half of preg, placentitis, fetal bronchopneumonia
diagnosing mycotic abortion
demo of fungus AS A TISSUE INVADER, histopath.
endometritis
common prob in mares caused by commensal bacteria- agents introduced into uterus at breeding/parturtion. Cleared from uterus in normal healthy mares.
dirty mare
persistent post breeding endometritis requiring intensive management
diagnising endometritis
clinical signs- failure to concieve, eviedence of purulent inflammation. Culture. Uterine biopsy
canine genital infections - male
prostatitis most common, orchitis, epididymitis
canine genital infections - female
puppy vaginatits, pyometra, metritis