LONDON - On World Malaria Day 2011 news was released that an experimental form of vaccination for malaria has given protection against the disease and should help scientists to understand the immune processes which need to be harnessed to achieve effective vaccination. The findings are written up in an article in the medical journal The Lancet by Professor Robert Sauerwein from Nijmegen University in The Netherlands and his colleagues, who report that when volunteers were deliberately infected with malaria while being treated with the prophylactic drug chloroquine they became resistant to subsequent infection 2.5 years later. Audio News hears from Professor Brian Greenwood of the London School of Hygiene and Tropical Medicine who co-wrote a comment article on this in The Lancet.