Apo-E is thought to stop the damage being done to the cholesterol, but with varying degrees of effectiveness.

BBC: Gene linked to heart disease risk

Maintain several net identities and use disposable e-mail accounts to limit the damage if the address gets sold or passed on to spammers or vandals.

BBC: The leaky net

Once the virus has established itself on a host computer, it quickly destroys all music and image files and disables the e-mail system, causing irreparable damage at some companies.

CNN: 'Melissa' May Have Built a False Sense of Security