15 May 2011 Updated at 13:04 ET
Malaria blocks 'super-infection'
People can be bitten by 700 malaria-infected mosquitoes a year in some countries
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The malaria parasite can ensure it keeps a host body all to itself by preventing further malarial infections, according to international researchers.
link-
http://www.bbc.co.uk/news/health-13387983