Starter : If you exercise regularly:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

19. 1.What are pathogens? Pathogens and Disease Task 2 You are Dr. IgnazSemmelweis 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. 2. How do pathogens cause disease? 3. How did IgnazSemmelweis change the way we look at disease?

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