22 January 2012
Last updated at 18:01
Nanoparticles (green) pictured in the lymph node (red) just half an hour after injection
Tiny capsules engineered to mimic part of the body's immune system could strengthen its response to vaccines, say researchers.
The nanoparticles, described in the journal Nature Materials, are a message sent from cells in the skin to warn of a threat.
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