Holding(s) in Company

3 December 2008

Microgen plc (the "Company")

Notifiable Interests

Further to the Company's recent announcement of a decrease in its issued share
capital to 86,830,192 Ordinary Shares, the Company received notice on 2
December 2008 in compliance with the Disclosure and Transparency Rules from
Aberforth Partners LLP confirming that its holding of 20,451,277 Ordinary
Shares now represents 23.55% of the issued share capital of the Company.

Aberforth Partners is interested in 17,780,577 of the voting rights of these
Ordinary Shares representing 20.48% of the issued share capital of the Company.
The shares are registered in the name of:

                                                               No. of shares
                                                                            
Aberforth Smaller Companies Trust plc                              9,706,126
(Nortrust Nominees Ltd A/c Aberfrth)                                                                            
                                        
                                                                            
Aberforth UK Small Companies Fund                                  5,216,351
(Nortrust Nominees Ltd A/c Aberfrth)                                        
                                        
                                                                            
The Church Commissioners for England                               1,471,800
(The Church Commissioners for England (Chase GIS) Nominees                  
Ltd)                                                                        
                                                                            
                                                                            
Aberforth Geared Capital & Income Trust plc                        1,386,300
(Nortrust Nominees Ltd A/c Aberfrth)                                        
                                                                            

If you require further information please contact:

A. Siddiqi, Company Secretary Tel: [phone]

www.microgen.com