Covering bio-terrorism:

Anthrax:

• CDC on Anthrax terrorism    Start here for basic facts from the US CDC
• Poynter Institute - basic guide
• Poynter Institute -- How to cover anthrax
• Official US militiary site
• Center for Civilian Biodefense Studies page on Anthrax
  A useful factsheet

Bio-terrorism in general:

• CDC Special page - BioTerrorism