Norton Anti-Virus (NAV) for

From Symantec:

Symantec AntiVirus for Palm OS is a Palm application that scans for and detects viruses in all Palm OS compatible devices. Symantec AntiVirus for Palm OS ensures maximum security for your data by running on-demand scans that detect and remove viruses directly on your handheld device, protecting data even between synchronizations. This is important because users can exchange files using the infrared port or can download files and email through a wireless Internet connection, and need access to antivirus protection at all times, not just when they are synchronizing data between their PC and their handheld device.