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THE CITIZEN, THURSDAY, MARCH 4, 2004. PAGE 11.
Healthy Pets
are Happy Pets
What is a vaccine?
Little speakers, big winners
Public school students from Brussels and Grey Central Public Schools competed against
each other in the annual public speaking contest at the Royal Canadian Legion in Brussels
on Feb. 25. These winning storytellers provided a good deal of enjoyment for the audience
with the stories they memorized. With Legion representative Jo-Ann McDonald are from left:
Jonathon Blake, Heidi Bachert, Megan Dolmage, Victoria Kellington winning first place,
Jordyn Sholdice, Brody TenPas and Chelsey Terpstra winning second place. (Ely,e DeBruyn photo)
Vaccines are administered to
stimulate an immune response and
provide protection against infectious
disease. The first vaccine was
developed by Dr. Edward Jenner in
1798. When Dr. Jenner vaccinated
people against the cattle disease
cowpox-(known as `vaccinia'), they
remained healthy when exposed to
the deadly smallpox virus (a virus
closely related to cowpox).
The immune system is a complex
series of body defense mechanisms
that protects against disease. The
main components of immunity are
lymphocytes (a type of white blood
cell) and chemicals produced by the
body called antibodies. Viruses,
bacteria, and other infectious
organisms act as antigens causing
lymphocytes to respond by
producing specific antibodies.
Newborn animals receive
temporary immunity froni their
mothers. Maternal immunity
declines steadily during the first 12
weeks of life. Young animals should
receive an initial series of two or
,more vaccines starting around eight
weeks of age. The first dose of
vaccine is a priming dose, while the
second dose boosts the response to a
higher, longer-lasting level of
immunity. Immunity has memory, so
that subsequent exposureqo the same
antigen results in a much faster
response, stopping the new infection
before, it can cause illness. Immune
memory fades with time; which is
why periodic booster vaccines are
needed.
Vaccination cannot guarantee 100
per cent immunity. Immunity can be
overcome by overwhelming
exposure to a high dose of a
particularly harmful strain of the
organism or when the animal is
unduly stressed or its immune
system is otherwise depressed. It is
important that the animal is healthy
when vaccinated to ensure proper
development of immunity. The
veterinary check-up prior to
vaccination ensures that your pet is
not sick when vaccination occurs.
This information is for educational
purposes and does not replace
regular veterinary care. Always
consult your veterinarian regarding
questions about your animal.
Copyright 2004 Dr. Kathleen Day.
All rights reserved.
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