Question 4

Question 4

Now read a passage about vaccinations. You will have 45 seconds to read the passage. Begin reading now.

Now listen to part of a lecture on this topic get a medical science class. As you listen, be sure to take notes.

The vaccinations against smallpox is one of the most successful ways vaccine for the nearest, about 200 years ago smallpox was a common and deadly disease.

If you contracted smallpox there was a 20 to 30 percent chance that you would die.

Yet, when doctors introduced a vaccine for smallpox in 1796. It helps the body to develop a crucial resistance against the disease.

This resistance occurred through two stages. Initially, the body develop antibodies or special sounds to destroy the disease in order to develop these antibodies. A weakened form of smallpox had to be administered to the patient through a vaccine.

Then patient’s immune system could recognize the disease. the weakened smallpox disease was not strong enough to kill the patient. Bryant was enacted because the body to generate antibodies specially designed sounds to find again smallpox.

These antibodies were released into the patient’s bloodstream and a tank that weakened smallpox disease destroying it in the process.

After the first stage, the patient’s body then stored some of the smallpox antibodies impulse in the future smallpox infection.

If the patient encountered the more lethal smallpox disease in the future. The patient had the antibodies ready to destroy the disease shortly after infection.

In this way, the smallpox vaccine eradicated the disease.

Today the smallpox disease has been killed off completely.

The professor discusses how vaccinations help people become immune to smallpox.

Explain how the smallpox vaccine because the body to develop an effective resistance to the disease.