clamav antivirus

i'm using email server qmail vpopmail qmailadmin qmailscanner spamassassin and clamav

the mail server working fine until W32.Mytob spread over internet.

it seems my qmailscanner and clamav can;t filter / can detect the said virus and everyday i have lot of the virus in mailbox

qmailscanner and clamav i'm using is the latest version.

is there any solution the filter the W32.Mytob ?

 

 

 

 

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