How Your Immune System Detects and Fights Infection
Imagine inhaling droplets containing a virus, getting bacteria into a cut or swallowing a harmful microorganism. The body does not wait until you feel ill before responding: barriers, chemical defences, immune cells and signalling molecules may begin reacting straight away. This raises our central question: how does the human body recognise an invading pathogen, organise a defence and remember some infections for the future?
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