IF YOU HAVE TO USE MULTIPLE PENDRIVES FROM A LOT OF VARIED SOURCES THEN YOU ARE DEFINITELY RUNNING ON A HIGH RISK OF GETTING INFECTED WITH A VIRUS.OF COURSE ANTIVIRUS IS A TOOL TO PREVENT THIS BUT YOU HAVE THOSE LONG CHORES OF SCANNING AND IF NOT ON AUTO MODE YOU MIGHT END UP GETTING A VIRUS.USE USB DISK SECURITY, SPECIFICALLY DESIGNED FOR PROTECTION AGAINST USB.IT WILL SCAN UP YOUR USB AS SOON AS YOU INSERT IT.