Disease How are diseases spread?

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Starter

A - Z � Can you list a disease for each letter?

A = Autism � B= Blisters � C = Cancer � D = …..????

Are all these diseases caused By microbes?

Do all microbes cause disease?

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What are microbes?

Microbes are very small living things and are sometimes called micro-organisms.

Microbes are so tiny that they cannot be seen with the naked eye.

How many different microbes can you name?

They can only be seen using a microscope.

Research the three types

Bacteria Virus Fungi

Microbes

�  Draw a picture of each

�  Describe their shape �  Describe their

structure �  Describe their

reproduction

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Different types of microbes There are three types of microbes:

bacteria viruses fungi

Bacteria fact file Microbe: Bacteria (e.g. salmonella and streptococcus)

Size: 1/1000 mm

Shape: Bacteria can be spherical, rod-shaped or comma-shaped.

Structure: Bacteria are single-celled organisms. Their genetic material is not contained within a nucleus. Some cause disease, but many are useful. Reproduction: Bacteria reproduce very quickly. Two can very quickly become four, then eight and so on.

Structure of a bacterium

How do bacteria divide?

Virus fact file Microbe: Virus (e.g. flu virus and HIV)

Size: 1/1,000,000 mm

Shape: Viruses have regular and geometric shapes. Structure: A virus is a simple organism that does not display all the characteristics of a living thing. It is made up of a protein coating and some genetic material. Reproduction: Viruses can only grow and reproduce within other living things. Viruses change and adapt to their environment very quickly.

Structure of a virus

Fungi fact file Microbe: Fungi (e.g. penicillium and yeast)

Size: Some fungi can actually be seen with the naked eye, others are slightly bigger than bacterial cells.

Shape: Fungi come in many different shapes.

Structure: Fungi have the most complex structures of all the microbes. They feed off other living things.

Structure of a fungus

Looking at microbes

How do we diagnose if people have a disease?

� We go to the doctor

� Work in pairs � One person acts as

the patient and reads out the symptoms

�  The other person acts as the doctor

�  The doctor will use the flow chart to decide which disease the patient has

�  They only get one guess �  The patient will let them

know if they are correct

Disease

Task �  Independently research a specific disease

– ebola, yellow fever or malaria �  You have 8 minutes to answer the

research questions on your sheet �  Form groups to discuss all of the diseases

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Plenary

� What are the three types of microbe that can cause disease?

� Write down one thing you have learned about each of malaria, ebola and yellow fever

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