Scientists have succeeded in making human volunteers immune to malaria by injecting them with genetic material. The breakthrough brings the prospect of a much-needed vaccine significantly closer. Malaria kills between one and two million people every year – mostly and mostly in Africa - and makes a further 500 million people ill. The hunt for a vaccine has lasted for more than 20 years. Dr Stephen Hoffman and his team of researchers have
taken from the malarial microbe, which can not cause the disease in themselves, into 20 volunteers, following successful tests on animals. The volunteers' immune systems were found to be as good as those of people who have naturally contracted the infection through a mosquito bite and recovered.
The passage states that scientists……… .
A)have just been successful in finding an effective vaccine against malaria
B)illegally carried out tests on more than 500 people
C)forced people to take part in their experiment to find a cure for malaria
D)have been looking for a way to protect people from malaria for over two decades
E)have so far found approximately one million volunteers to take part in their tests
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