Exposure to pesticides has been implicated in a variety of health complications, including birth defects, nerve damage, cancer, and even decreased sperm count. A research team from George Washington University's Department of Environmental and Occupational Health investigated 17 recent studies testing the effects of certain pesticides on male fertility. Researchers targeted studies that involved pyrethroids and organophosphates, two pesticides that humans are commonly exposed to. Out of all 17 studies, 15 reported significant damage to sperm quality due to pesticide exposure. Almost all studies found that sperm concentration had decreased while some reported sperm motility obstruction.