A new study by geneticists from the US state of Kentucky sheds light on why the bugs are becoming increasingly resistant to insecticides - substances for killing insects.
Scientists have identified 14 genes have bugs related to biological changes.
Under the influence of toxic substances from the bugs thickened shell chitin, which is why they are less affected by chemicals, and the internal mutations do not allow toxins to harm their nervous system.
The prevalence of bedbugs increases in the US, Europe and Australia. The researchers hope that the results of their research will help find new ways to combat the insect.