Biology B1 1.4 Pathogens and disease.

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What are pathogens?
Pathogens are tiny microorganisms, usually either bacteria or viruses.
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What happens once pathogens are inside the body?
They reproduce rapidly and may produce toxins (poisons) that make you feel ill.
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Where inside the body do viruses reproduce and what happens?
Viruses reproduce inside the cells and damage them.
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Why is it important to wash hands?
Washing hands removes pathogens from them.
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Who was the first doctor to realise that washing hands removes pathogens from them?
Semmelweiss.
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What do pathogens cause?
Infectious diseases.
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Which are smaller, bacteria or viruses?
Viruses are much smaller than bacteria and reproduce inside cells, causing damage to the cells also make you ill.
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How did Semmelweiss realise that hand washing would reduce the spread of infection?
Despite there being no knowledge of bacteria and viruses at that time, Semmelweis realised that infection could be transferred from person to person in a hospital.
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What did Semmelweiss do when he realised that infection could spread between patients?
He instructed his staff to wash their hands between treating patients.
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How do pathogens make you feel ill?
They produce toxins/damage cells.
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Why did it take a long time for others to accept the ideas of Semmelweiss?
No-one knew about bacteria and viruses.
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Card 2

Front

What happens once pathogens are inside the body?

Back

They reproduce rapidly and may produce toxins (poisons) that make you feel ill.

Card 3

Front

Where inside the body do viruses reproduce and what happens?

Back

Preview of the front of card 3

Card 4

Front

Why is it important to wash hands?

Back

Preview of the front of card 4

Card 5

Front

Who was the first doctor to realise that washing hands removes pathogens from them?

Back

Preview of the front of card 5
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