Humans can spot small signs of sickness at a glance, research suggests

Humans may use a host of facial cues - visible just hours after an infection starts - to avoid contracting illnesses from others, study indicates

Coughing, sneezing and clutching the stomach might be obvious signs of sickness, but humans can also spot if someone is healthy simply from a glance at their face, new research suggests.

Scientists have found that signs of a person being acutely unwell - such as pale lips, a downward turn of the mouth and droopy eyelids - are visible just hours after an infection begins.