Pathogens, transmission and the body's external defences

What this note covers

1. Pathogens cause infectious disease through invasion
2. Direct and indirect contact use different routes
3. Fluids, vectors, food and water can carry pathogens
4. Skin and digestive defences block entry
5. Respiratory, urogenital, ear and eye surfaces defend themselves
6. Transmission evidence links route to prevention

6 sections · 10 key terms & formulas · 6 common mistakes