The researchers said they found a "statistically significant" difference between the breath profiles of the mice infected with the bacteria and the mice that were uninfected.

BBC: Lung infection identified using 'breath-print'

Or at school admissions offices, where the under-the-breath sniping between the parents imperils the applicant's chances.

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For centuries, other cultures have understood the relationship between our breath and dealing with stress.

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Reaching for my bulging file of financial paperwork I had compiled, I tossed it on the table between us and took a deep breath in anticipation of what his sound advice would be.

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Moreover, the sheer sexiness of "A Little Night Music" (which is, among other things, a musical about the difference between sex and love) comes across with breath-catching directness.

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What remained to be seen was whether the breath's metabolic contents varied enough between people - and varied little enough within an individual - to be diagnostic - to act as a real and repeatable "breathprint".

BBC: Exhaled breath is unique fingerprint