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Explain that active immunity is gained after an infection by a pathogen, or by vaccination
Describe that specific antibodies have complementary shapes which fit specific antigens
State that each pathogen has its own antigens, which have specific shapes
Explain how development of antibiotic-resistant bacteria, including MRSA, can be minimised by using antibiotics only when essential
State that antibiotics kill bacteria but do not affect viruses
Describe a drug as any substance taken into the body that modifies or affects chemical reactions in the body
Describe the effects of tobacco smoke and its major toxic components (nicotine, tar and carbon monoxide): strong association with bronchitis, emphysema, lung cancer, heart disease, and the association between smoking during pregnancy and reduced birth weight of the baby
Describe the effects of excessive consumption of alcohol: reduced self-control, depressant, effect on reaction times, damage to liver and social implications
Explain that the cholera bacterium produces a toxin that causes secretion of chloride ions into the small intestine, causing osmotic movement of water into the gut, resulting in diarrhoea, dehydration and loss of ions from the blood
Explain the importance of a clean water supply, hygienic food preparation, good personal hygiene, waste disposal and sewage treatment in controlling the spread of cholera (details of the stages of sewage treatment are not required)
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