While discussing about Transmissible Diseases in Health Education class, Leony asked about immunizations.
Here's some information for you :
(credit :
http://www.nlm.nih.gov/medlineplus/ency/article/002024.htm)
Vaccines are used to improve your immune system and prevent serious, life-threatening diseases.
Information
HOW VACCINES WORK
Vaccines "teach" your body how to defend itself when germs, such as viruses or bacteria, invade it:
- They expose you to a very small, very safe amount of viruses or bacteria that have been weakened or killed.
- Your immune system then learns to recognize and attack the infection if you are exposed to it later in life.
- As a result, you will not become ill or you may have a milder infection. This is a natural way to deal with infectious diseases.
Four types of vaccines are currently available:
- Live virus vaccines
use the weakened (or attenuated) form of the virus. The measles, mumps,
and rubella (MMR) vaccine and the varicella (chickenpox) vaccine are
examples.
- Killed (inactivated) vaccines are made from a protein or other small pieces taken from a virus or bacteria. The flu vaccine is an example.
- Toxoid vaccines
contain a toxin or chemical made by the bacteria or virus. They make
you immune to the harmful effects of the infection, instead of to the
infection itself. Examples are the diphtheria and tetanus vaccines.
- Biosynthetic vaccines contain manmade substances that are very similar to pieces of the virus or bacteria. The Hib (Haemophilus influenzae type B) conjugate vaccine is an example.
WHY WE NEED VACCINES
For
a few weeks after they are born, babies have some protection from germs
that cause diseases. This protection is passed from their mother
through the placenta before birth. After a short period, this natural
protection goes away.
Vaccines help protect against many diseases
that used to be much more common. Examples include tetanus, diphtheria,
mumps, measles, pertussis (whooping cough), meningitis, and polio. Many
of these infections can cause serious or life-threatening illnesses and
may lead to lifelong disabilities. Because of vaccines, many of these
illnesses are now rare.
SAFETY OF VACCINES
Some people worry
that vaccines are not safe and may be harmful, especially for children.
They may ask their health care provider to wait or even choose not to
have the vaccine. But the benefits of vaccines far outweigh their risks.
Scientific
studies have shown that vaccines and their components, such as the
preservative thimerosal, do not cause autism or ADHD. Based on these
studies, the American Academy of Pediatrics, the Centers for Disease
Control and Prevention, as well as the Institute of Medicine conclude
that the benefits of vaccines outweigh their risks.
Other information about risks:
- Getting the actual infection from vaccines:
Unless a person's immune system is weakened, it is unlikely that a
vaccine will give the person the infection. Vaccines, such as the
measles, mumps, rubella, the chickenpox, and nasal spray flu contain
live but weakened viruses and should not be received by persons with
weakened immune systems.
- Allergic reactions: Such reactions are rare and are usually to some part (component) of the vaccine.
- Danger of live vaccines:
Certain live vaccines may be dangerous to the fetus of a pregnant
woman. These include the measles, mumps, rubella vaccine, the chickenpox
vaccine, and the nasal spray flu vaccine. To avoid harm to the baby,
pregnant women should not receive any of these vaccines. The health care
provider can tell you the right time to get these vaccines.
COMMON IMMUNIZATIONS
