Holding(s) in Company

27 May 2008

Microgen plc (the "Company")

Notifiable Interests

Following the Company's recent announcement of an increase in its issued share
capital to 102,899,776 Ordinary Shares, the Company received notice on 23 May
2008 in compliance with the Disclosure and Transparency Rules that Aberforth
Partners LLP that its holding of 19,391,277 Ordinary Shares now represents
18.84% of the issued share capital of the Company.

Aberforth Partners is interested in 16,530,477 of the voting rights of these
Ordinary Shares representing 16.06% of the issued share capital of the Company.
The shares are registered in the name of:

                                                               No. of shares
                                                                            
Aberforth Smaller Companies Trust plc                              7,721,426
(Nortrust Nominees Ltd A/c Aberfrth)                                        
                                                                            
Aberforth UK Small Companies Fund                                  6,169,351
(Nortrust Nominees Ltd A/c Aberfrth)                                        
                                                                            
The Church Commissioners for England                               1,328,200
(The Church Commissioners for England (Chase GIS) Nominees                  
Ltd                                                                         
                                                                            
Aberforth Geared Capital & Income Trust plc                        1,311,500



If you require further information please contact:

G.E. Liddle, Company Secretary Tel: [phone]

www.microgen.com