Annual Information Update

Microgen plc

Information Management Solutions

Annual Information Update

5 May 2006

                    Microgen plc: Annual Information Update                    

In accordance with Prospectus Rule 5.2, Microgen sets out below a summary of
the information which has been published or made available to the public during
the period 1 April 2005 to 4 May 2006.

This annual information update is required by and is being made pursuant to
Article 10 of the Prospectus Directive (Prospectus Rule 5.2) and not for any
other purpose. Information is referred to in this update rather than included
in full. The information referred to was up to date at the time it was
published; however, some information may now be out of date.

1. Regulatory announcements

The following UK regulatory announcements have been issued through PRN or RNS,
both Regulatory Information Services. They can be viewed or downloaded from the
London Stock Exchange Web Site (www.londonstockexchange.com) in the Market News
section, searching under Microgen's code MCGN.

Date Regulatory Headline and Detail

10-Apr-06 PDMR Shareholding

06-Apr-06 Director/PDMR Shareholding

05-Apr-06 Block Listing Return

03-Apr-06 Directorate Change

29-Mar-06 PDMR Shareholding

15-Mar-06 Final Results

24-Feb-06 Notice of Results

15-Dec-05 Pre-Close Trading Update

14-Nov-05 Notifiable Interests

07-Nov-05 Acquisition

03-Nov-05 Notifiable Interests

06-Oct-05 Notifiable Interest

23-Sep-05 Director Shareholding

19-Sep-05 Notifiable Interests

15-Sep-05 IFRS Statement

15-Sep-05 Interim Results

05-Sep-05 Notice of Results

01-Aug-05 Notifiable Interests

26-Jul-05 Acquisition of Freehold Property

13-Jul-05 Trading & Acquisition

01-Jul-05 Acquisition

13-May-05 Offer Withdrawal

05-May-05 Offer Update

29-Apr-05 Offer Update

28-Apr-05 Offer Update

28-Apr-05 Offer for AttentiV

12-Apr-05 Result of AGM

12-Apr-05 AGM Trading Update

2. Documents filed at Companies House

Date Document Type

03-Apr-06 Form 88(2) Return of Allotment of Shares

23-Mar-06 Form 88(2) Return of Allotment of Shares

23-Mar-06 Form 88(2) Return of Allotment of Shares

15-Mar-06 Form 88(2) Return of Allotment of Shares

06-Mar-06 Form 88(2) Return of Allotment of Shares

22-Feb-06 Form 88(2) Return of Allotment of Shares

13-Feb-06 Form 88(2) Return of Allotment of Shares

03-Feb-06 Form 88(2) Return of Allotment of Share

11-Jan-06 Form 88(2) Return of Allotment of Shares

05-Jan-06 Form 403a Declaration of Satisfaction of Mortgage or Charge

05-Jan-06 Form 403a Declaration of Satisfaction of Mortgage or Charge

09-Dec-05 Form 88(2) Return of Allotment of Shares

05-Dec-05 Form 88(2) Return of Allotment Shares

23-Nov-05 Form 88(2) Return of Allotment of Shares

08-Sep-05 Form 287 Change in Registered Office

30-Sep-05 Share Agreement Relating to the issue of shares on acquisition of R/
Base Limited

02-Sep-05 Form 88(2) Return of Allotment of Shares in connection with
acquisition of

R/Base Limited

07-Jun-05 Form 363 Annual Return made up to 12 April 2005

11-May-05 Annual Accounts For the Year ended 31 December 2004

21-Apr-05 Mem/Arts Memorandum and Articles of Association

21-Apr-05 AGM resolutions

3. Annual and interim reports

The Group's Annual Report for the year ended 31 December 2005 (submitted to the
UK Listing Authority's Viewing Facility on 10 April 2006) and Interim Report
for the six months to 30 June 2005 can be downloaded from the Investor
Relations section of the Microgen Web Site (www.microgen.co.uk).

A copy of this Annual Information Update and all documents referred to in it
can be obtained from the Group's registered office:

Microgen plc

Fleet House

3 Fleetwood Park

Barley Way

Fleet

Hampshire

GU51 2QJ

For further information, please contact:

Gerry Liddle, Company Secretary 01252 772313