Vaccines Flashcards
Maternally derived antibodies last how long in cats and dogs?
~16wks
Earliest to start vaccines in cats/dogs?
6-8wks
Earliest to administer Rabies
12-16wks
Earliest to administer FeLV
8-12 wks
Earliest to administer Lepto/Lyme/Influenza
12wks
How often to booster vaccines?
3-4 wks
If wait longer than 6wks to booster vaccines
won’t get appropriate secondary immune response
First annual boosters should include
EVERYTHING
Typical 3 year vaccine schedule
canine rabies, DA2pp, frcp
Typical 1 year vaccine schedule
lepto, lyme non adjuvanted rabies vaccine
How often to administer bordetella vaccines?
6m, 1 yr
Reason to vaccine failures
- maternal antibodies
- acute disease state
- stressors
- Administration Errors
Mild adverse vaccine reactions
mild general malaise and pain around injection site
Severe adverse vaccine reactions
anaphylaxis or sarcoma
T. 1 Hypersensitivity reaction
anaphylaxis
mediated by IgE & antigen
Tx: Antihistamines +/- glucocorticoids +/- epinephrine
T.2 Hypersensitivity reaction
Mediated by IgM & IgG
Autoimmune resulting in ab +/- complement
Ex: IMHA, IMTP
T. 3 Hypersentitivity reaction
Mediated by IgM & IgG
Serum sickness
Ex: anterior uveitis
T. 4 Hypersensitivity reaction
cell-mediated immune response only; delayed reaction
Ex: granuloma formation, cutaneous vasculitis
Risk factors for adverse vaccine reactions
- total number of vaccines administered during a single visit
- bacterial or spirochete vaccines
- patient–breed, wt, age
Examples of noninfectious vaccines
rabies, canine influenza, coronavirus, whole killed cell bacterins, western diamondback rattlesnake avenomous vaccine
Safest kind of vaccine?
Noninfectious vaccines– considered the safest because they cannot revert to virulence and cannot cause disease
Noninfectious vaccines require how many doses and why?
2, first dose primes the immune response and second dose provides protective immune response
Examples of Infectious Vaccines
Distemper, parvovirus, adenovirus-2, parainfluenza
Infectious vaccines require how many doses and why?
1 at 14-16wks; one dose will prime, immunize and boost the immune response– if MDA does not interfere
Canine Distemper Virus
SS enveloped RNA virus
quickly inactivates in environment
survives longer in cooler temps
Canine Distemper Virus Transmission
direct contact or exposure to infectious secretions/excretions (resp and urine)
**Inc susceptiblity 3-6m old
CDV pathogenesis
enters via oral nasal route, replicates in lymphoid tissue, shedding begins at time of epithelial colonization, occurs from all body secretions, shedding at 60-90 days
CDV infection and severity vary on
viral virulence, age of animal and immune status
CDV strong immune response
virus is cleared & animal completely recovers
CDV weak immune response
virus able to reach epithelial tissue and CNS initial clinical signs disappear or may be mild, but virus persists in system (lungs, skin, CNS)
CDV No immune response
virus continuous to replicate and spread throughout the body– in CNS there is acute demyelinization and most dogs die in 2-4 wks after ifnection
Where can CDV be harbored in subclinical infections?
CNS
CDV acute signs
purulent bilateral serous oculonasal discharge
diarrhea
vomiting
dermal pustules
neuro signs: seizures, vestibular signs, paresis, myoclonus
CDV longterm signs
“Old dog encephalitis”
enamel hypoplasia
hyperkeratosis
CNS signs
CDV dx
- vaccine hx & C/S
- inclusion bodies on conjunctival, blood and urine
- virus neutralization– Gold Standard
Canine Adenovirus 1 (CAV1)
Nonenveloped DNA virus (more resistance, more stable)
Canine Adenovirus 1 (CAV1) transmission
animal to animal contact or indirectly through exposure to infectious saliva feces, urine or resp secretions fomites
Canine Adenovirus 1 (CAV1) pathogenesis
enters via oral or nasal cavity, replicates in vascular endothelial cells, renal and hepatic parenchymal cells
incubation period: 4-6 d
shed in urine for 6-9 months after ifnection
Canine Adenovirus 1 (CAV1) C/S
- fever, lethargy, inappetance
- vasculitis
- vomiting, diarrhea, anorexia, icterus, DIC, coagulopathy
- Glomerulonephritis
- CNS & resp signs
- ocular lesions
Canine Adenovirus 1 (CAV1) Dx
- based on C/S &/or no vaccines hx
- PCR on ocular secretions, feces or urine
- PM
Canine Parvovirus (CPV2)
Nonenveloped, ss DNA virus, very small
Highly resistant to inactivation, highly contagious, environmentally stable
Canine Parvovirus (CPV2) Transmission
Direct oral contact with contaminated feces or virus
indirect via fomites (including humans)
Canine Parvovirus (CPV2) Pathogenesis
- incubation 7-10 days
- viremia 1-5 d post infection
- virus replication occurs in rapidly dividing cells (intestinal crypt cells & myocardial cells & bone marrow)
Canine Parvovirus (CPV2) primarily affects which cells?
myocardium & GI epithelium
Canine Parvovirus (CPV2) causes what, if infected in utero or <8wk
Fading Puppy Syndrome
***crying, dyspnea, enteritis
Canine Parvovirus (CPV2) lives in GI epithelium causing
sloughing of villi leading to profuse vomiting, diarrhea and anorexia
Canine Parvovirus (CPV2) Dx
Fecal ELISA – ag test
PCR– more costly
Rabies Virus
ss, enveloped RNA
-extremely labile to UV light & heat
can remain viable in carcass for several days
routine disinfection & cleaning easily kills
Rabies Virus Phases
Prodromal Stage, Furious, Paralytic
Rabies Virus: what leads to hydrophobia?
paralysis of larynx
Rabies Virus Dx
- signs, vx hx
- no pre-mortem test
- immunofluorescence of neural tissue
Feline Herpes Virus-1 (FHV-1)
Enveloped, double stranded DNA virus
Very fragile in environment; highly contagious
Feline Herpes Virus-1 (FHV-1) Transmission
direct cat to cat via ocular, oral or nasal seretions, indirectly via fomites
Feline Herpes Virus-1 (FHV-1) Pathogenesis
- Enters via oral or nasal cavity
- Replicates in teh nasal, nasopharyngeal tissues and tonsils
- Incubation period is 2-5 days
- acutely infected shed virus for 1-3 weeks
Feline Herpes Virus-1 (FHV-1) Latent infection
in Trigeminal ganglia, with period recrudescence
Feline Herpes Virus-1 (FHV-1) C/S
Mild to severe URD
ulcerative keratitis with dendritic ulcerations and corneal sequestrums
chroni crhinitis
Feline Herpes Virus-1 (FHV-1) Dx
C/S
Definitive– virus isolation by ELISA and IF
Calicivirus
Enveloped RNA virus
Calicivirus Transmission
direct cat to cat via ocular oral or nasal secretions, indireclty via fomites
Calicivirus Pathogenesis
- Enters via the oral or nasal cavity
- Incubation period 3-4d
- acutely infected shed virus for 2-4 wks
- carries are common and shed continuously, ilfelong carriers exist but not as common as herpes
Calicivirus C/S
Oral ulcers most prominent feature
UR signs mild to more severe with conjunctivits and rhinitis
lameness and joint swelling
may be assoc with lymphoplasmocytic gingivitis
Calicivirus Dx
C/S
Defintiive- virus islation and IF
Feline Parvovirus–Panleukopenia
Nonenveloped, single stranded DNA virus, very small
Feline Parvovirus–Panleukopenia Transmission
Direct contact with contaminated feces or virus
indirect via fomites
in utero
Feline Parvovirus–Panleukopenia Pathogenesis
- incubation period 7-10 d
- Virus replication occurs rapidly in dividing cells (intestinal crypt cells and myocardial cells) and bone marrow
- Viral shedding lasts only 1-2 days, but can be as long as 6 wks
Feline Parvovirus–Panleukopenia C/S if infected in-utero or <2 wks can cause
cerebellar hypoplasia
Feline Parvovirus–Panleukopenia Peracute Form
Fading Kitten Syndrome
- Sudden death– die w/in 12 hrs
- Accounts for 25% of kitten mortality
Feline Parvovirus–Panleukopenia Acute Form C/S
Enteritis, fever, depression, anorexia
Secondary effects such as dehydration and septicemia, DIC
Feline Parvovirus–Panleukopenia Dx
- Hx/C/S– profound leukopneia
- Fecal ELISA– canine ag test
- PCR and titers– costly
Which pathogens are included in the canine infectious tracheobronchitis vaccine?
parainfluenza
bordetella bronchiseptica
adenovirus T1 & 2
Which pathogens are not included in the canine infectious tracheobronchitis vaccine?
mycoplasmas strep canis influenza resp coronavirus herpesvirus canine pneumovirus
Which bacteria are missing a cell well and why is this significant?
Mycoplasma spp
**may antibiotics such as penicillins and beta lactams ineffective
CAV2 and Parainfluenza Transmission
Oral route of infection
CAV2 and Parainfluenza Pathogenesis
replicates and damages bronchial epithelial cells, can have extensive lung lesions w/o overt c/s– signs occur when it is complicated by other viral or bacterial pathogens
BOrdetella bronchiseptica Pathogenesis
affects ciliated epithelium and once colonizaiton occurs, bordetella produces a variety of potent toxins among other things that imparis cilium
Mycoplasma sp Pathogenesis
affects both cilianted and noniliated eptihlium and disturbs the upper and lower resp tract
Mycoplasma sp causes
purulent bronchitis and bronchiolitis
Viral infections are typically restricted to
Upper Respiratory Tract
**Causes edema in the larynx leading to honking cough then damage to teh tracheal epithelium that alows for secondary infections
Canine Resp Dz complex C/S
honking cough, laryngitis, cough on tracheal palpation, +/- productive cough, retching
mucoid to mucopurulent discharge, rhinitis, bronchopneumonia
Leptospira spp in dogs
L. Interrogans and L. kirschneri
Leptospira is a
spirochete with hook-shaped end
L. interrogans serovars of importance in USA
icterohaemorrhagiae canicola pomona bratislava ballum
L. kirschneri serovars of importance
grippotyphosa
What inactivates Leptospira?
freezing and UV radiation
Where does lepto cause disease?
maintained in renal tubules of reseroivr host and excreted in urine
Lepto reservoirs
rodents (icterhemorrhagica) mice coons possums fox skunks cows pigs deer horses
Lepto transmission
direct or indirect contact with infected host, urine or body excretions
***Can penetrate INTACT mucous membranes
Lepto C/S are commonly undiagnosed in canine’s because
many infections are asymptomatic
Lepto C/S
renal or hepatic failure, uveitis, pulmonary hemorrhage, acute febrile illness or abortion, bleeding tendencies d/t vasculitis & direct vascular damage by spirohceses
Lepto Dx Gold Standard
Leptospira Microscopic Agglutination Test (LMAT)
**needs to be performed during the acute stage of disease
OR PCR
Feline Leukemia Virus (FeLV)
SSRNA, enveloped virus
Feline Leukemia Virus (FeLV) Transmission
prolonged intimate contact
in utero
transfusions
milk
Feline Leukemia Virus (FeLV) susceptibility
kittens more susceptible, resistance increases with maturity but not absolute
Feline Leukemia Virus (FeLV) 3 outcomes of exposure
Effective Immune Response
Progressive Infection
Regressive infection
Feline Leukemia Virus (FeLV) Profressive infection
Cat succumbs to dz with a few years, with 3 subgroups
i. clinical illness and viremia
ii. clinical illness, viremia & neoplasia
iii. nonregenerative anemia
Feline Leukemia Virus (FeLV) Regressive infection
virus contained by still incorporated into hosts genome leads to latent infection
Canine Parvo– Coronavirus causes
enteritis in generally very young neonates, highly contagious
Canine Parvo– Coronavirus affects which cells?
small intestinal villus cells (parvo affects intestinal crypts)– bloody diarrhea not common
Lyme disease is caused by
Borrelia burgdorferi
**corkscrew shaped bacterium of the spirochete group
Borrelia burgdorferi is transmitted by
bite of Ixodes species of ticks after prolonged feeding (>12h)
Lyme disease–Borrelia burdorferi C/S
occur 2-5 months after tick exposure
**joint pain, lameness, fever, anorexia and lethargy
Lyme disease–Borrelia burdorferi Dx
- ELISA– ab test; can tell there has been exposure, but not necessarily dz
- Western blot for confirmation
Lyme disease–Borrelia burdorferi Vaccination
whole cell killed bacterin or recombinant OspA vaccine
Rattlesnake vaccine intended to protect against
western diamondback ratlesnake
Rattlesnake vaccine lasts for
6months
Rattlesnake vaccine works
by generating antibodies against venom which neutralize the venom
Rattlesnake vaccine is what kind of vaccine?
Toxoid– much like tetanus toxoid
Feline Immunodeficiency Virus (FIV)
enveloped RNA virus
Feline Immunodeficiency Virus (FIV) Transmission
bite wounds, kittens can acquire passive ab from FIV pos queen
Feline Immunodeficiency Virus (FIV) vaccine contains which clades?
A & D– challenge studies have been conflicting if these protect against other clades
Feline Immunodeficiency Virus (FIV) Dx
Ab test (cannot differentiate vx from natural infection) Western blot is the confirmatory test
Feline Infectious Peritonitis (FIP) is triggered by
feline coronavirus
Feline Infectious Peritonitis (FIP) vaccine is what kind of vaccine?
modified live virus