Notifiable Interest

19th January 2007

Microgen plc (the "Company")

Notifiable Interests

The Company received notice on 18th January 2007 under Sections 198-202 of the
Companies Act 1985 that Aberforth Partners LLP is interested in 17,767,151
Ordinary Shares representing 17.31% of the issued share capital of the Company,
which is currently 102,651,776 Ordinary Shares.

The shares are registered in the name of:

                                                                  No. of shares
                                                                               
Nortrust Nominees Limited A/C ABERFRTH                               14,197,751
                                                                               
Bank of Ireland Nominees Limited                                        767,800
                                                                               
The Church Commissioners for England (Chase GIS)                      
Nominees Limited                                                      1,118,500
                                                           
Chase Nominees Limited A/C 43721                                      1,683,100
                                                                               
                                                                     17,767,151

If you require further information please contact:

G.E. Liddle, Company Secretary

Tel: [phone]

www.microgen.co.uk