Sniffing out a diagnosis

http://www.sciencealert.com/scientists-have-developed-a-new-biosniffer-that-can-detect-diseases-on-your-breath

PS

When we were medical students in the early 1960s, we were regaled with stories of respected older physicians who entering the wards for a ward round, would detect the presence of a Typhus patient in the ward, by an identifiable smell.

Philip G V