Klez virus the worst ever

Making its first appearance in mid April, the Klez.H email virus has become the most prolific of all time, with UK email filtering firm Message Labs reporting that they have blocked 775 000 infected emails since the outbreak began. Although the virus can only be spread through the opening of infected email attachments, it confuses recipients by constantly evolving in form and selecting random names from victims' address books to use as the sender's address.