Many people have commented in the study , bed bugs are not harmful. But Borrell says no insects are without harm ; Its levels can be more or less. Insect saliva contains a type of protein that causes red rashes and other allergic infections. In addition, these insects infect the human body with a foul-smelling fluid that causes asthma. Insect bites also cause anemia. Borel traveled to eastern Europe and collected some beetles from some of the attics in the deep jungle. He looked at research and data and found that the first human contact with beetles occurred 200,000 years ago. Probably when our ancestors used to come to the cave to do their daily necessities. Getting rid of beetles is a daunting task.