Researchers have discovered that a key chemical found in sweat is what attracts the mosquito that spreads malaria in Africa to bite its human victims. With this knowledge, scientists believe that they can develop a range of new anti-mosquito sprays and traps. Only the female mosquito bites people, and can identify a human victim largely using its sense of smell even up to hundreds of metres away. There are at least 300 million acute cases of malaria each year globally, resulting in more than a million deaths. Around 90% of these deaths occur in Africa, mostly in young children.

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