The immune system has to establish which cells belong to us and which are foreign, no mean feat.
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Nobel laureate Peter Doherty explains immunity.
An increasingly mobile global population is making it easier for infectious diseases to spread.
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Travel allows us to see the world – and bring foreign diseases home. Here’s why spreading disease is easier than ever.
Isolated peoples’ immune systems haven’t learned how to resist bugs.
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There are numerous examples of the havoc infectious diseases can play on communities that have not previously been exposed to them.