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AQA GCSE Biology – Topic 3: Infection and Response – Revision Notes

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Comprehensive revision notes for AQA GCSE Biology Topic 3: Infection and Response. These notes cover the key content needed for GCSE Biology revision, including: Communicable and non-communicable diseases Viral, bacterial, fungal and protist diseases Human defence systems White blood cells and the immune response Vaccination and how vaccines work Antibiotics and antibiotic resistance Drug development and testing Plant diseases and plant defence responses Ideal for AQA GCSE Biology students preparing for class tests, mock exams and GCSE exams. The notes are organised by topic to make revision easier and quicker. Specification: AQA GCSE Biology Topic: 3 – Infection and Response Level: GCSE

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Pathogens : microorganism that can cause disease
Diseases → communicable / infectious disease. HOW
PATHOGENS SPREAD ?

• Influenzas
• measles
(Tiny droplet that
We cough or Sneeze )
Stop it Spreading :
• washing hands
• cleaning cooking items
• Spreading insecticides
• Malaria Protists • Quarantine /isolate
• vaccination
Microorganism> fungi, bacteria, Protists, Viruses
Through the air Diseases such as influenza and
measles can spread via tiny droplets of saliva that we
expel when we cough or . sneeze
Contaminated water - Diseases such as cholera can
spread through water sources contaminated by the
diarrhoea of infected people.
contaminated food - Diseases such as salmonella are
spread by eating food which has been infected with
salmonella, and then not cooked properly.
Direct contact - Athlete's foot is spread by walking

, barefoot on surfaces contaminated with the fungi.




WHAT ARE VIRUSES :
• Not calls, living ( 10 00 00 x smaller
• called ( organism) than animals cells )
• Can't reproduce by themselves ( damage our cells )

EXAMPLES OF VIRAL DISEASES TOBACCO
MEASLES HIV MOSAICVIRU
S
( TMV )
- Spread by droplets - Affects Plant :
when an infected • TOBACCO
person cough or Sneezes . TOMATO
Photosyn thesis can't
take place .
( not disease )

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September 21, 2026
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