http://www.who.int/csr/delibepidemics/biochem1stenglish/en/
http://www.who.int/entity/csr/delibepidemics/biochem1stf/en/index.html

It groups in one place all the information that has now been published: the latest press releases from WHO, updated frequently asked questions about biological and chemical agents as well as links to other relevant information from WHO. Documents on PDF format, Acrobat Reader required.