Regular malaria attacks, fatal forms of tuberculosis, persistent outbreaks of syphilis, and rotting wounds and cuts were a common threat to the life of our ancestors. Modern mankind has been much more fortunate: thanks to the development of ever new ways to prevent epidemics, the population of our planet can safely prevent outbreaks of diseases not only among people, but also in many species of animals. Howbeit, in the 21st century, other non-communicable diseases began to threaten the well-being of people. But what if we are mistaken in underestimating some “non-contagious” diseases for their contagiousness?

What are non-contagious diseases?

According to official statistics, about 41 million people die every year due to diseases that are not transmitted from person to person. Different types of cancer, cardiovascular diseases, severe forms of diabetes, respiratory diseases and other chronic diseases take many lives. According to the World Health Organization, non-communicable diseases are the main cause of death in more than 70% of all recorded deaths in the world.

Non-communicable diseases are thought to arise from a combination of genetic factors with environmental factors or the lifestyle of an individual, but are not transmitted by bacteria, viruses or fungi. Experts note that microbes located both on the human body and inside it have a great impact on human health.

According to an article published on, some types of microorganisms daily help with the vital functions of the human body by controlling important physiological systems, including metabolism, digestion and immunity.

During the research, experts collected saliva and stool samples from 290 people living in close proximity to each other in order to determine the types of bacteria that inhabit their microbiomes. As a result of the experiment, scientists revealed specific patterns of bacterial transmission in each of the communities, especially among people living in the same house. And if the mother and her children had many similar microorganisms, then the spouses had even more. Thus, a couple with type 2 diabetes is more likely to get this disease within a year of being diagnosed with one of the partners. Similar trends were observed in experiments with inflammatory bowel diseases in both humans and animals.