An eery kind of computer virus

How is a computer virus similar to a biological virus?  As biological viruses threaten biological body parts, computer viruses can pose threats to mechanical implanted body parts.  A British scientist has "infected" himself  with a computer virus as he studies how computer viruses might effect artificial parts, such as pacemakers, cochlear implants, and automated limbs.  He noted that once the RFID chip that was implanted in his body was infected, the computer virus spread to the system that the chip communicated with.  For a more complete story, see this Financial Times article.