Mosquitos began biting humans more than a million years ago | An analysis of 38 modern mosquitoes’ DNA suggests an ancestral mosquito species developed a preference for feeding on early humans between 2.9 and 1.6 million years ago,

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The NHS says it is life-threatening and can be hard to spot, while the UK Sepsis Trust says there are about 50,000 sepsis-related deaths in the UK each year.

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