8 Infectious and Non-infectious Diseases infectious Diseases Unit 4 Prevention Is Better than Cure 1 What are infectious diseases? 1. Look at the pictures below and answer the questions. (1) According to Jenny’s symptoms, what infectious disease may she have? (2) How did she most likely catch the disease? (3) Do you think she could have prevented or reduced the risk of catching it?
If I had received the vaccination earlier, I might not have caught the disease.
2
1
Jenny
2. There are three main factors causing infectious diseases. We can use a triangle to show these three factors.
bacteria, fungi, viruses and parasites that get into the human body
1. Sources of infection places where pathogens live and reproduce (e.g. human body and sewage) 2. Transmission routes droplets in the air, contact, blood, food and vectors (e.g. mosquitoes)
Pathogens
Infectious diseases
young, old or weak people
Environment
People at high risk of infection
Triangle of infectious diseases
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