AEterna Zentaris Announces Second Quarter Financial Results Conference Call and Webcast QUEBEC CITY, Aug. 4 /PRNewswire-FirstCall/ -- AEterna Zentaris Inc. (TSX: AEZ; Nasdaq: AEZS) announced that its quarterly conference call and webcast have been scheduled for Wednesday, August 11, 2004 at 10:00 a.m. Eastern time. The call will follow the press release of AEterna Zentaris' second quarter 2004 financial results issued earlier on the same day. Participants may access the live webcast via the Company's website at http://www.aeternazentaris.com/ or by telephone by using the following numbers: 416-640-4127, 514-807-8791 or 1-800- 814-4941. A replay of the webcast will also be available on the website from August 11 through September 11, 2004. AEterna Zentaris is a biopharmaceutical company with an extensive portfolio of marketed and development-stage products in oncology, endocrine therapy and infectious diseases. DATASOURCE: AETERNA ZENTARIS INC. CONTACT: AEterna Zentaris, Media Relations, Paul Burroughs, (418) 652-8525 ext. 406, ; U.S. Investor Relations, Lippert/Heilshorn & Associates, Kim Golodetz, (212) 838-3777, ; Investor Relations, Jacques Raymond, (418) 652-8525 ext. 360, (514) 703-5654 cell., To request a free copy of this organization's annual report, please go to http://www.newswire.ca/ and click on reports@cnw.

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