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Controlling Disease
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Slide 1

Controlling Disease

Controlling Disease

We are an attractive dish for microbes!

Slide 2

Louis Pasteur

Louis Pasteur

People thought that food went off because it was in contact with air. They thought:

Air + food microorganisms grow

Pasteur said that microbes come from microbes

He did som experiments to prove this -

Slide 3

Louis Pasteur

Louis Pasteur

Slide 4

Pasteurs Experiment

Pasteurs Experiment

He poured some grape juice in 2 flasks

He then produced a swan neck in the glass

He heated the flasks to boiling

One flask was left

The other had its neck broken off

Which went off? Why?

Slide 5

Pathogens

Pathogens

= microorganisms which cause disease

Drugs are used to help people with diseases

Painkillers relieve the symptoms without curing the disease

Antibiotics chemicals which kill bacteria, but not viruses. Viruses develop in cells and are hard to kill

Slide 6

Bacteria Drug Resistance

Bacteria Drug Resistance

Bacteria in nature are varied. A few have the resistance to antibiotic

When the antibiotic is used there is a natural selection for the bacteria with the most drug resistance.

These survive and breed and become more common

Slide 7

Testing for Antibiotic Resistance in Bacteria

Testing for Antibiotic Resistance in Bacteria

Clear of bacteria

Bacteria colonies growing near disc of antibiotic

Discs of different antibiotics

Slide 8

Antibiotic Resistance in Bacteria

Antibiotic Resistance in Bacteria

Many strains of bacteria have resistance to antibiotic due to natural selection

So we need a range of antibiotics to fight disease with the best one for the job

To slow down more antibiotic resistance developing in pathogenic bacteria we need to avoid over using antibiotics

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