Total Voting Rights

31 July 2012

Microgen plc ("Microgen")

Total Voting Rights

In accordance with DTR 5.6.1 of the FSA's Disclosure Rules and Transparency Rules (DTR), Microgen announces that as at today's date, its issued share capital comprises 81,557,378 ordinary shares of 5p each with voting rights ("Ordinary Shares"). No Ordinary Shares are held in treasury. The voting rights of all of the Ordinary Shares are identical. The figure above may be used by shareholders as the denominator for the calculation by which they will determine if they are required to notify their interest in, or a change to their interest in, Ordinary Shares in Microgen under the DTR.

If you require further information please contact:

A. O'Neill, Company Secretary 020 7496 8100

www.microgen.com