Aptitude Regulatory News (APTD)

5 October 2011

Microgen plc ("Microgen" or the "Company")

Application for Block Listing

The Company announces that an application has been made to the UK Listing Authority and the London Stock Exchange for a block listing of 422,191 ordinary shares of 5p each in relation to the Microgen Company Share Option Plan 2006 and the Microgen Performance Share Plan 2006, to trade on the London Stock Exchange and to be admitted to the Official List upon issuance. The shares will rank pari passu with the existing ordinary shares of the Company.

For further information, please contact:

A. Siddiqi, Company Secretary

Tel: 020 7496 8100

www.microgen.com