Injects inactive pathogen into body to stimulate white blood cells to produce antiobodies.
if pathogen tries to enter body again, white blood cells RAPIDLY respond to produce antibodies, preventing infection.
If large population is immune, spread is reduced.
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B6.2 - Antibiotics and painkillers.
Painkillers treat symptoms but dont kill pathogens.
Antibiotics kill bacterial pathogens.
Resistant bacteria cannot be killed by antibiotics and can duplicate defeating antibiotics.
Antibiotics dont kill viruses as they reproduce inside the cell and every strand is different.
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B6.3 - Discovering drugs
Extracted from plants or microorganisms e.g penecilin.
Penecillin - Alexander Fleming - Penecillin mould
Chemical can be extracted by plant or fungus.
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B6.4 - Developing drugs
Tested in labs using cells, tissues and live animals.
Preclinical testing - in lab on cells tissues and animals.
Clinical trials - healthy volounteers and patients, used in low dosages for saftey and then higher dosage for optimum dose
Double blind trials - given real and placebo (fake) drug, neither doctor or volounteer knows which is which. used to test side effects and effectivness.
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