Bluetooth connectivity actually serves the dual-purpose of wide interoperability and galvanic isolation. As of early 2014, BITalino will also start launching it's accessory line, which will include a special purpose opto-isolated USB adapter.
As it stands now, you can already use a standard FTDI breakout (BITalino has a compatible pinout to the ones used for the Arduino Pro Mini).
Keep in mind though that without an adequate accessory and if you have a sensor such as the ECG / EMG / EDA, in the unlikely event of a high-voltage power surge (e.g. lightning strike) capable of blasting through the protection on your electrical box, power outlet, or computer, it may lead to injury.