Centers for Disease Control and Prevention toenail fungus http://www.cdc.gov/fungal/nail-infections.html toenail fungus toenail fungus Centers for Disease Control and Prevention https://www.cdc.gov/fungal/nail-infections.html toenail fungus toenail fungus on this website toenail fungus https://www.cdc.gov/fungal/nail-infections.html toenail fungus cdc.gov cdc.gov toenail fungus toenail fungus Fungal Nail Infections toenail fungus affects about half of Americans by age 70 fungal infections toenail fungus