A new version of the fast-spreading Bagle mass-mailing worm was discovered Friday, with its threat level quickly rising to a moderate level, according to security experts. <A HREF="http://news.zdnet.com/2100-1009_22-5432334.html?tag=zdnn.alert">Bagle.BB, also known as W32/Bagle.bb@MM,</A> was raised to a medium risk assessment by security company McAfee. The virus had triggered more than 100 reports to McAfee's antivirus and vulnerability emergency response team by early morning in Europe. Antivirus software makers have also identified two other variants of the Bagle virus that are successfully spreading.