2.3 avoiding microbes
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2.3 Avoiding microbes. Slide 1. 2.3 How clean is it?. Where might you find most microbes?. Slide 2. 2.3 Avoiding microbes. Picking up microbes. Sneezes are an obvious source of microbes but where else can you pick them up?. Slide 3. 2.3 Avoiding microbes. Removing microbes. - PowerPoint PPT PresentationTRANSCRIPT
© Oxford University Press 2009
2.3 Avoiding microbes
Slide 1
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Where might you find most microbes?
2.3 How clean is it?
Slide 2
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Sneezes are an obvious source of microbes but where else can you pick them up?
Picking up microbes
2.3 Avoiding microbes
Slide 3
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Whenever new homes are built, pipes like this are used to connect them to sewers.
Sewers take human wastes away so diseases have less chance to spread.
Removing microbes
2.3 Avoiding microbes
Slide 4
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Microbes reproduce fast when they have a good source of food…
…and what’s food for us is food for them too.
Growing your own
2.3 Avoiding microbes
Slide 5
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Many foods are stamped with dates to show when they should be eaten by.
Often that’s just before the microbes in them have made the food smell rotten.
Use by dates
2.3 Avoiding microbes
Slide 6
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Find out which sorts of food have the closest use-by dates.
Out of date?
2.3 Avoiding microbes
Slide 7
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It’s hard to avoid colds, or know who passed you the virus.
The microbes that cause STI’s (sexually transmitted infections) only survive for a few seconds outside the body…
…so it’s easier to protect yourself.
2.3 Staying safe
Slide 8
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During sex, body fluids mix.
Condoms stop body fluids mixing during sex.
STI transmission
2.3 Staying safe
Slide 9
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2.3 Match up
Match the hazardous microbe to a method that will stop it spreading.
1. Chlamydia
2. Salmonella
3. Cold virus
4. E. coli from faeces
Good sewers
Wash hands often
Use a condom
Cook food well, don’t keep it warm
Show answers
Slide 10
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2.3 Match up
Match the hazardous microbe to a method that will stop it spreading.
1. Chlamydia
2. Salmonella
3. Cold virus
4. E. coli from faeces
Good sewers
Wash hands often
Use a condom
Cook food well, don’t keep it warm
Slide 11
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Questions to answer
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Questions to answer
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Q10. List four sources of microbes.
Slide 23
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Q11. Why is it good to keep sewers in a good state of repair?
Sewers take human wastes away so diseases have less chance to spread.
Slide 24
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Q12. Use by dates on food are only a rough guide. Explain why.
Many foods are stamped with dates to show when they should be eaten by.
Often that’s just before the microbes in them have made the food smell rotten.
Slide 25
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2.3 Match up
1. Chlamydia
2. Salmonella
3. Cold virus
4. E. coli from faeces
Good sewers
Wash hands often
Use a condom
Cook food well, don’t keep it warm
Show answers
Q13.
Match the hazardous microbe to a method that will stop it spreading.
Slide 26
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Q14. Describe four ways of cutting the number of infections you get
Slide 27
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