Holding(s) in Company

23 July 2009

Microgen plc (the "Company")

Notifiable Interests

The Company received notice on 23 July 2009 in compliance with the Disclosure
and Transparency Rules from Invesco Limited confirming that it is interested in
the voting rights of 4,491,984 Ordinary Shares representing 5.17% of the issued
share capital of the Company.

The shares are registered in the name of:

                                                      No. of Ordinary Shares
                                                                            
Bank of New York                                                   3,249,474
                                                                            
JP Morgan Chase                                                      305,374
                                                                            
Citibank                                                             937,136

If you require further information please contact:

A. Siddiqi, Company Secretary Tel: [phone]

www.microgen.com