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The smell of disease passes from the sick to the healthy

06.10.2018

The inflammation that starts with illness changes the smell of the body, so that those who are close to the sick person can literally smell the disease. Moreover, not only animals, but also humans can smell it, despite the fact that our sense of smell leaves much to be desired.

Researchers from the Monell Center found that the immune system of a healthy individual in the smell of someone else's inflammation senses a potential threat. In the experiment, mice were injected with bacterial lipopolysaccharides - pieces of polymer molecules that make up the bacterial cell wall. The mouse's immunity sensed this as an infection and included various defenses, including an inflammatory response. Sick mice were placed with healthy ones, which, however, could not get infected from sick mice - they still did not have a real bacterial infection.

The urine of healthy and sick animals was given to sniff other mice, which were accustomed to distinguish the smell of inflammation. It turned out that after some time spent together, the urine of healthy rodents began to smell like the urine of sick mice - sniffing mice confused them with each other. When the urine was analyzed by chemical methods, it turned out that the urine of healthy animals actually became similar in composition to the urine of patients.

The experiment was repeated, only now sick and healthy mice were kept so that they could not physically contact each other, but could smell each other. The results were the same. This means that it was not a matter of physical contact (although, as we said, mice could not become infected from each other), but of smell: healthy animals smelled the disease, and their immunity took preventive measures - which, in turn, affected their actual smell. It is possible that the human immune system behaves in the same way, but whether it is so or not, it will become clear after additional research.

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The student is recognized by the eyes 11.11.2003

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The system, which costs £60, is supposed to speed up and improve service in the school cafeteria and library. Schoolchildren pay at the beginning of the week for daily breakfasts, and the money is accepted by the machine.

Every day, a student, coming to the dining room, looks from a distance of 15 centimeters into the eyepiece of a special retinal scanner - and the cost of the dishes taken by him is debited from his personal account. In addition, the child's special dietary requirements related to allergies, other illnesses, or the family's religious practices may be entered into the computer. If a student takes a dish that is not allowed to him, the system will warn the attendant in the canteen about this.

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