Notifiable Interests

microgen

Information Management Solutions

www.microgen.co.uk

1st August 2005

Microgen plc (the 'Company')

Notifiable Interests

The Company received notice on 29th July 2005 under Sections 198-202 of the
Companies Act 1985 that Aberforth Partners is interested in 11,513,151 Ordinary
Shares representing 11.25% of the issued share capital of the Company, which is
currently 102,327,567 Ordinary Shares.

The shares are registered in the name of:

                                                                  No. of shares
                                                                               
Nortrust Nominees Limited A/C ABERFRTH                                9,278,351
                                                                               
Bank of Ireland Nominees Limited                                        584,000
                                                                               
The Church, Commissioners for England (Chase                            769,900
GIS) Nominees Limited                                                          
                                                                               
State Street Nominees Limited A/C JD59                                  880,900
                                                                               
                                                                     11,513,151

If you require further information please contact:

G.E. Liddle, Company Secretary

Tel: [phone]