Infection and response
- Pathogens
- Viruses
- Bacteria
- Protists
- Fungi
- Spread
- Direct contact
- Water
- Air
- Diseases
- Measles, HIV, TMV
- Salmonella, gonorrhoea
- Rose black spot
- Malaria
- Non-specific defences
- Skin
- Nose
- Trachea and bronchi
- Stomach
- White blood cells
- Phagocytosis
- Antibodies
- Antitoxins
- Vaccination
- Dead or inactive pathogen
- Quick antibody response
- Population protected
- Antibiotics and painkillers
- Kill bacteria only
- Painkillers treat symptoms
- Resistant strains
- Drug development
- Plant sources
- Preclinical testing
- Clinical trials
- Placebo, peer review