Dogs can be trained to detect Covid-19 by sniffing human sweat, study suggests

A trained dog takes part in a Covid-19 sniffing test.

(CNN)Dogs can be trained to detect Covid-19 by sniffing human sweat, according to a proof-of-concept study published on Thursday.

Detection dogs are already a common sight in airports and some other public places -- usually, they're sniffing out drugs, weapons or explosives.
But specially trained dogs have also been taught to detect infections and diseases, including colon cancer, malaria and Parkinson's disease.
Now, many countries worldwide are exploring the possibility of using dogs as a rapid, reliable and relatively cheap way to prescreen people for Covid-19 or perform rapid checking in certain circumstances, like at airports.