A lot of research depends upon making comparisons between healthy and sick individuals. And the results of these comparisons have been used to develop newer and better diagnostics, prophylactics and treatments. The current study is also pretty much based on comparison between ducks that are infected with the Bird Flu virus and those that were completely healthy. The only difference here being that the comparison involved the smell of the feaces of the two groups of ducks in question, and the ‘detectors’ of these olfactory differences were lab-trained mice!

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