Click through to Symantec's web site and you see that the worldwide number of infections is between 0 and 49. Which probably means 1, or 0.0000001% of the number of S60 smartphones in the world. Hardly on the 'loose'. And, now that more people are educated about not installing programs they receive unsolicited, the number of infections might be up to, ooh, maybe as much as 10 by 2007. A truly terrifying 0.000001% of installed S60 devices and well worth blasting some self-publicity across the Symbian world.... Not.
Shame on Symantec for trying to frighten the world with a press release.
Relevant link: The truth about Symbian OS 'viruses'