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Vaccine /'vasksim/

^ E Comprehension

Read the text and choose the correct answer.

  1. Pasteur used his work on pasteurisation to A move his specialisation to microbiology. В find ways to protect food and people from infection.

С make a theory of germs.

D prevent microorganisms being in the air.

  1. Pasteurisation A kills only dangerous microorganisms.

В works for a limited time.

С doesn’t work with wine.

D kills all the microorganisms.

  1. Pasteur’s vaccinated animals A recovered from the disease.

В died from the disease.

С didn’t suffer from the disease.

D didn’t catch the disease.

  1. Pasteur became a hero when A he invented pasteurisation.

В a vaccine saved a boy’s life.

С he discovered vaccines.

D a colleague developed a rabies vaccine.

  1. Because of Pasteur,

A we eat less tasty food.

В there are no germs anymore.

С many serious diseases are rare.

D we don’t need to keep food cool.

Before you listen

Discuss these questions with your partner.

What vaccinations have you had?

Do you know of any diseases for which we cannot be immunised?

What vaccines would you like to see developed?

H F Listening N)))

Listen to the extract from a lecture about immunisation. Then listen again and fill in the gaps in the tapescript.

Historically, being immunised against diseases is a relatively new thing but that doesn’t mean the idea hadn’t been thought of before. If we go as far back as 429 BC, the historian Thucydides

noted that after a (1) plague in

Athens, those who survived did not become infected again. This was at a time before there was even recognition of such things as

(2) and viruses.

Nowadays, we take it for granted that we will be vaccinated and avoid diseases like polio but how many of us actually stop to ask

ourselves what is behind the (3)

we have? How does vaccination work? Basically, it is the process by which a person is exposed, that is, made open to an agent so

t

т.

hat his or her immune system develops against that agent. The immune system makes antibodies which fight against infection.

Once the human immune system is exposed to a disease, it is able to act against any future infection. Vaccination exposes a person to an immunogen - something which helps develop immunity - in a controlled way by using

a (4) dose so he or she

doesn’t become ill while being immunised.

The good thing about a vaccination programme is that it can limit the spread of a disease among a population, reducing the risk for people who have not been vaccinated so we have something which is known as herd

  1. That means when the

number of non-immune people has dropped to a certain level, the disease will disappear from the whole population. This is how nowadays we have achieved the elimination of many diseases.

H G Speaking

Discuss these questions with your partner.

How do you think Redi’s work helped Pasteur?

How do you think Jenner’s work helped Pasteur?

Do we need vaccination? Are there any negative aspects to it?

Task

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