What is a vaccination?
A vaccine for your cat is just like a vaccine for your children. It contains a modified or
dead virus that enters the blood stream through an injection, intranasal spray, or edible form. The
immune system reacts to this intruder and creates antibodies for the specific virus being introduced.
Over the course of a few weeks, these antibodies will be created and remembered for future protection
providing larger and faster responses. If the cat is ever exposed to a dangerous or live form of the
virus, they now have an adequate response system that will keep them from getting sick or help to lessen
the severity of the illness.
It is important that you do not vaccinate a cat that is ill as their weakened immune system may not be able to
fight off the injected virus.
Why do I want to vaccinate my cat?
Vaccinating your cat helps them build an immunity to certain diseases that could lead to expensive vet bills or
death. Some vaccines, such as Rabies, are also mandated by law.
What are the vaccines my cat should have?
There are two main groups of vaccines, core and non-core. Core vaccines are recommended for all cats and
include Rabies. Non-core vaccines are recommended based on your cat and your situation. If your cat is an
outdoor cat, more non-core vaccines are recommended than would be for an indoor cat.
The core vaccines are Panleukopenia (FPV), herpesvirus (FHV), calicivirus (FCV), and Rabies. The first three
are usually combined into one vaccine called FVRCP and cover most respiratory diseases. The first injection of
FVRCP should occur between six and eight weeks, before rehoming, and with boosters every three to four weeks
until the kitten reaches sixteen weeks. Most Vets then recommend a booster at one year and then boosters every
three years after. Like with any vaccine, it is possible that your cat may still get an infection, but it will
be less severe than if they were not vaccinated.
The frequency of a Rabies vaccine is usually mandated by state or local ordinance and often must be
administered by a vet. It is recommended that kittens receive their first vaccine at 8-12 weeks, then a booster
at one year. Then, depending on ordinance, you may be able to shift to an approved three year booster.
The non-core vaccines are FeLV (feline leukemia virus), FIP (feline infectious peritonitis), FIV (feline
immunodeficiency virus), Chlamydophila felis, and Bordetella bronchiseptica. These vaccines should be discussed
with your Vet as your pet may not need all or any of them.
The FeLV is a non-core vaccine that does not have a 100% protection rate. Some cats may become infected
regardless of vaccination. Cats who remain indoors should not be at risk for this. Cats with outdoor access may
need it as it can be transmitted through bites received in cat fights. Vets recommend giving it to kittens with
a booster, and then if the cat is established as an indoor cat they will not need to be vaccinated for it
again. A small, in house, blood test called a snap test should be performed before vaccination as positive cats
should not be vaccinated. If your cat is an outdoor cat, it is recommended that they receive two vaccines
two-three weeks apart, a booster at one year and then annual boosters.
FIP is caused by coronaviruses which are transmitted by feces. Many cats infected with coronaviruses never
develop FIP, less than 1-5% of cats develop it. The vaccine is not recommended often as there is much
controversy surrounding it. Coronaviruses can be avoided by keeping litter boxes clean.
FIV should be discussed carefully with your doctor. It protects against some, but not all, strains of the virus
and is recommended for cats that go outdoors. However, it also currently causes the serological snap-test to
read as positive, so it is important that if you have your cat vaccinated that you keep close watch on them and
have it noted in a visible location on their chart.
Chlamydophila felis prevents some forms of feline penumonitis. It is still possible to come down with some
strains of it, however cats that have been vaccinated against it have a shorter, milder illness. It should be
given with caution as it has caused adverse reactions in 3% of cats. It is recommended for multi-cat households
in which there have been confirmed cases of the virus.
Bordetella bronchiseptica comes in the form of a modified live intranasal (inhaled through the nose) vaccine,
and prevents a severe lower respiratory tract disease that is found mostly in kittens. The virus normally
responds well to antibiotics, so the vaccine is not normally recommended except for multi-cat homes with a
When should I vaccinate my cat?
When you should vaccinate depends on what vaccines you are giving. FVRCP is recommended at 6-8 weeks, with
boosters every three-four weeks until sixteen weeks, a booster at one year and then three year upkeep. Rabies
is recommended at 8-12 weeks, with a one year booster and annual or three year upkeep. Non-core vaccines should
be discussed with your Veterinarian.
My cat is a senior, should I bother to continue vaccinating?
Yes. Part of being a responsible pet owner is protecting your cat and preserving their quality of life.
Vaccines keep cats happy and healthy by preventing serious, life threatening diseases.
How much do vaccines cost?
This depends on your veterinarian, but on average the first years' vaccines cost between $45 and $85, then
$10-$35 each year after. This cost varies based on which vaccines are administered. If you adopt from a rescue
or shelter be sure to ask if they have already administered the first round of kitten vaccines.
There are a number of low-cost clinics, and you can administer some vaccines (never Rabies) yourself. If you
choose to vaccinate at home, however, be sure to order from a reputable company such as DrsFosterSmith.com.
Should I have my cat dewormed when I get him vaccinated?
Sure! Why not? You're already there and as part of your kitten's first exam or your cats annual check up your
Vet should be performing a fecal exam. If there are signs of infestation you will need to deworm, and kittens
are often dewormed as a preventative measure. Deworming can cause nausea and diarrhea and should only be done
under Vet supervision. Kittens should be dewormed at two-three weeks and then again at 5-6 weeks with
subsequent treatments if necessary. Many Vets will recommend deworming with a safe dewormer every month till
Cats who are ill should NOT be dewormed. Deworming is essentially injecting or ingesting a poison that is
deadlier for the worms than their feline host. A weakened cat may not be able to resist the toxic effects.
Roaming, outdoor cats should be tested twice a year and it is reasonable to deworm for round and tape worms
regularly even without a positive test result.
What side-effects can occur after vaccinating?
As with most things in any practice of medicine, there are risks of side effects. Most side effects from
vaccines are mild and come in the form of injection site discomfort, mild fever, loss of appetite, sneezing for
up to a week following an intranasal vaccine, and a small, firm swelling at the site.
More serious side effects include severe allergic reactions and VAS or vaccine associated sarcoma. Sarcoma's
are soft-tissue cancers that can show up at injection sites. It can take up to ten years before these develop
and they are very rare, affecting 1:1000 to 1:10,000 vaccinated cats. There appear to be genetic
predispositions and geographic factors.
Contact your Vet immediately if you think your cat is having a reaction to their vaccines.
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