Page 33 - 新思维科学学生用书4 样章
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1  Living Things



              Continued

              Vaccinations today


              •  Is there a vaccination programme for children in your local area?

              •  If so, which diseases are children vaccinated against?

              •  How are the vaccinations for the different diseases given?
                  For example, an injection to prevent flu.

              •  How have the ways of giving vaccinations changed since the time of

                  the first vaccination?


              Be prepared to share your findings with your class.




           Infectious diseases


           An infectious disease is a disease that is caused by very tiny living

           things we call germs. The germs infect your body. This means

           the germs get into your body and make you ill. We take

           medicines to kill the germs that infect our bodies.

           People, animals and plants can all have infectious

           diseases. Flu, measles and malaria are some infectious                             leaf blast
           diseases that humans can have.                                                     disease

           Infectious diseases in plants can harm different parts

           of the plant. For example, leaf blast can kill young

           rice plants.

           Bird flu is an infectious disease that infects birds,

           humans and other animals. Almost all birds that get
           bird flu die. Bird flu spreads easily from sick birds to

           healthy birds. The farmer in the picture is checking

           the chicken for signs of bird flu. Many farmers give

           vaccinations to their chickens, geese and ducks to

           prevent them from getting bird flu.




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