An international group of scientists from Brazil, USA, Peru and Puerto Rico found that the spectrum of microorganisms that come into contact living in the city people, different from what you are selling residents a less settlements. When citizens lack a lot of bacteria and microbes that support immunity.
Specialists conducted a study which found out that in urban homes South America can be seen not too many germs common in nature — for example, occurring in the soil. Scientists say that such microbes have evolved together with man and since ancient times coexisted with them and, therefore, may be necessary to maintain human health. Previously, the lack of “natural” bacteria already linked, including, with negative influence on the immune system and increased risk of allergies, reports livescience.com.
Only the researchers studied four types of settlements: an isolated village surrounded by jungle, rural community, small town and large city. Scientists took samples of microbes from the walls and floor kitchens, bedrooms and bathrooms in the homes of each of these places. Interestingly, the total number and biological diversity of bacteria was in all cases approximately the same: a large city was not “clean” a village or Vice versa. However, the specific set of bacteria was so different that, according to the scientists, it was possible to guess where it was taken, not even knowing about it in advance. The less urbanized the area was, the most “natural” bacteria in it occurs.
The experts, who published their work in the journal Science Advances, admit that their findings should not be considered final, the job was not too extensive and it used data from only one region. However, they expect that their findings will help in further studies.
That bacteria and other microorganisms are “good” and “bad” science has long been known. In the evolution of many bacteria have learned not to interfere with more complex living beings and to help and protect them. Today scientists know that the human body bacteria and germs more than its own cells.