Why are vaccines effective in preventing disease?

Answer 1

Vaccines help prevent disease because they insert a slightly different strain (or species) of the disease. They usually change the disease so that it only effects chickens. Your body learns basiclly how to fight it and reconize it.

Answer 2

Because they trick the immune system into thinking you are sick with that disease-causing organism and so it uses the pattern of the organism contained in the vaccine to create antibodies which are capable of fighting that specific organism if it is ever encountered again after the vaccine has taken effect.

The vaccines contain pieces of the organisms (that are unable to make you sick), so as to provide the pattern/template for your immune system to make perfectly shaped defensive antibodies.

Answer 3

Vaccines introduce the weakened or killed bacteria or viruses into the body so the immune system will have an easier time fighting this easier version of the illness and build up a stronger immunity. Then the immune system can remember how to combat the disease and have the antibodies ready so that if the person catches the disease they can be immune to the illness.

Answer 4

Rather than "diseases", vaccines target "illnesses", usually caused by viruses.

In order to create a vaccine, medical researchers must identify the type of illness, the cause, and determine how to interrupt the mechanism by which the "bug" makes us sick. Researchers unlock the DNA strands of a virus, for example, to find a way to replace a piece, thereby preventing the virus from multiplying.

Vaccines can be a "dead" virus or a "live" virus in diluted strength, just enough to trigger an immume response but not enough to cause the illness. Usually, it takes a year or many years to work on a virus, develop a vaccine, test it, and then release small batches for community testing.

Diseases, on the other hand, usually are not treated with vaccines because the causes of diseases are varied and are not caused by a virus. Researchers are beginning to try to unlock the mysteries of certain diseases, but it will be decades likely before they develop any standard vaccine to prevent disease.

Answer 5

It's a very faulty theory. Vaccines for certain viruses have traces of the virus it's meant to protect from. They believe the immune system will adjust & familiar itself with the virus. But on some occasions, you can actually get the virus you're trying to protect yourself from by being vaccinated. The Swine Flu vaccine was recalled due to massive "allergic reactions", of course this was not the case. The Swine flu vaccine had traces of both Swine flu & Bird flu. The truth is, getting vaccinated for any virus can actually kill you via the very virus you got vaccinated for.

Answer 6

They create immunity, preventing the spread of infectious and often deadly disease.

The disease smallpox (which could kill up to 30% of those infected and leave serious scarring on many survivors) is now extinct due to vaccines. The disease polio was eliminated from all but four countries at one time due to vaccines, but prejudice and ignorance has since allowed polio to spread back out to more than ten countries. Many other diseases are kept in control with vaccines.

Answer 7

they help you immune system get used to the germ and your white cells will know that there is a kind of this germ