1. Starter :If you exercise regularly: You have a higher _ _ _ _ _ _ _ _ _ _ _ ratio, therefore you have a higher _ _ _ _ _ _ _ _ _ _ _ _ _. You have a lower _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ level which means you have less chance of getting _ _ _ _ _ _ _ _ _ _ _. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

2. Infectious Diseases Some infectious diseases are mild. e.g. Common cold Tonsillitis 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

3. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

4. Infectious Diseases Some infectious diseases kill. e.g. Influenza (Flu) HIV (AIDS) 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

5. Microorganism Infectious diseases are caused by microorganisms entering the body. Microorganisms that cause diseases are called pathogens. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

6. Infectious A person is said to be infectious if they can pass the microorganisms to another person. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

7. Types of Pathogen There are two groups of microorganisms that are pathogens. Bacteria Viruses 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

8. Differences Between Bacteria and Viruses Bacteria are single celled living organisms. Some are useful, like the ones used to make cheese, treat seweage or make medicine. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

9. Differences Between Bacteria and Viruses Viruses are smaller than bacteria and have regular shapes. Viruses cause disease in all living organisms, even in bacteria. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

10. The Cause of Disease When bacteria enter the body they reproduce rapidly by dividing into two. They often produce toxins. Some directly damage cells. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

11. The Cause of Disease When viruses enter the body they enter the cells. They reproduce, destroying the cell before they move onto another. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

12. Task 1: Answer the questions in full sentences. 1. What is a pathogen? 2. What is an infectious person? 3. Make a table to explain the differences between bacteria and viruses. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

13. Ignaz Semmelweis In the 1850’s many women mysteriously died after giving birth. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

14. Ignaz Semmelweis The disease was called childbed fever. Many people believed that those that died were being punished for having a baby outside of marriage. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

15. Ignaz Semmelweis He noticed that his medical students went straight from a dissection to delivering a baby, without washing their hands. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

16. Ignaz Semmelweis He insisted that all doctors at his hospital should wash their hands before delivering a baby. Much fewer women died from childbed fever. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

17. Ignaz Semmelweis Semmelweis made it his mission to educate other doctors about his findings. But he had trouble convincing doctors that there was an invisible infectious agent that doctors were carrying on their hands. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

18. Ignaz Semmelweis His battle still continues today. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

19. Task 2 You are Dr. Ignaz Semmelweis in 1857. Write a letter to Dr. R Bledstrom, head of medicine in Austria. Explain your theory about childbed fever and your struggle to convince doctors to take appropriate action. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?

20. Peer Marking Points  Childbed fever is caused by doctors carrying an infectious agent on their hands.  If doctors wash their hands prior to delivery, less women die.  Other doctors are unwilling to believe that something they cannot see could cause disease.  Other doctors are also unwilling to acknowledge that they might be responsible. 1.What are pathogens? Pathogens and Disease 3. How did Ignaz Semmelweis change the way we look at disease? 2. How do pathogens cause disease?