Holding(s) in Company

20 April 2007

Microgen plc (the "Company")

Notifiable Interests

The Company received notice from Aberforth Partners LLP dated 18 April 2007 in
compliance with the Disclosure and Transparency Rules that following an
acquisition Aberforth Partners LLP is interested in a total of 19,091,277
Ordinary Shares in the Company representing 18.60% of the Issued share capital
of the Company.

The notification from Aberforth Partners states that the registered holders of
shares to which it can exercise voting rights are as follows:

                                                                     Number of 
                                                                       Shares  
                                                                               
Aberforth Smaller Companies Trust plc                                 7,246,426
(Nortrust Nominees Ltd A/c Aberfrth)                                           
                                                                               
Aberforth UK Small Companies Fund                                     6,763,451
(Nortrust Nominees Ltd A/c Aberfrth)                                           
                                                                               
Aberforth Geared Capital & Income Trust plc                           1,206,500
(Nortrust Nominees Ltd A/c Aberfrth)                                           
                                                                               
The Church Commissioners for England                                  1,216,800
(The Church Commissioners for England (Chase GIS) Nominees Ltd)                
                                                                               
                                                               Total 16,433,177


The total number of voting rights in Microgen plc is 102,651,776.

If you require further information please contact:

G.E. Liddle, Company Secretary

Tel: [phone]

www.microgen.co.uk