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It's not inconceivable that people suffering viral infections emit characteristic odours that canines smell, but it's very hard to imagine dogs could ever alight on specific viruses.
Here's the Malaria study, based on the plausible premise that Plasmodium parasites cause infected humans to emit specific mosquito-attracting odours. No similar mechanism exists for Corona.https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(19)30220-8/fulltext …
