DOGS can be trained to detect more than 90 percent of Covid-19 infections even when patients are asymptomatic, according to research published on Monday, which authors hope could help replace the need to quarantine new arrivals.
Using their remarkable sense of smell - which can pick up the equivalent of half a teaspoon of sugar in an olympic-sized swimming pool - dogs have already shown that they can sniff out maladies such as cancer, malaria and epilepsy.
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