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?

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?

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?

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?

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?

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?

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?

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?

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?

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?

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?

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?

Ignaz Semmelweis

In the 1850’s many women mysteriously diedafter 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?

Ignaz Semmelweis

The disease wascalled childbed fever. Many people believed that thosethat 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?

Ignaz SemmelweisHe 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?

Ignaz SemmelweisHe 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?

Ignaz SemmelweisSemmelweis 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?

Ignaz SemmelweisHis 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?

Task 2You 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?

Peer Marking PointsChildbed 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?