The human immune system is a complex system that has developed in the evolution process and the exchange of genes between different subspecies of ancient man. The results of the study can be read on the pages of The American Journal of Human Genetics.
Human development and genetic mixing of Neanderthals to the denisovans created a basis for immunity, experts say. Most modern human populations was the result of crossing the people of Eastern Europe and Africa. This fact allowed the person to buy a whole set of factors that protect it from viral and bacterial diseases.
However, not all scientists agree with this position. There is a theory according to which a mixture of two species has resulted in the emergence of people have allergies and asthma. So far, this theory has no scientific confirmation.