How do white blood cells respond when the same pathogen re-enters the body after vaccination?
How do white blood cells respond when the same pathogen re-enters the body after vaccination?

How do white blood cells respond when the same pathogen re-enters the body after vaccination?
What happens when small quantities of dead or inactive forms of a pathogen are introduced into the body during vaccination?
How can the spread of pathogens be reduced by immunizing a large proportion of the population?
How does vaccination help prevent illness in an individual?
Even with modern synthesis, how might a chemical extracted from a plant be used in developing new drugs?
How are most new drugs synthesised in the pharmaceutical industry?
How was penicillin discovered, and who discovered it?
From which plant does the painkiller aspirin originate?
Where does the heart drug digitalis originate from?
How were drugs traditionally extracted from plants and microorganisms?