Malaria vaccine shows early promise in clinical trials
9 August 2013 Last updated at 01:37 BST
A malaria vaccine has shown promising results in early stage clinical trials, according to researchers.
Researchers found the vaccine, which is being developed in the US, protected 12 out of 15 patients from the disease, when given in high doses.
The method is unusual because it involves injecting live but weakened malaria-causing parasites directly into patients to trigger immunity.
Stuart Hughes reports.