IDEXX Laboratories Launches HerdChek* PRVgB Antibody Test Kit for Pseudorabies Virus Screening in Swine Herds

The Netherlands, EU July 1, 2004—IDEXX Laboratories, Inc. (NASDAQ: IDXX), announces the launch of a new ELISA test kit for the detection of antibodies in serum and/or plasma against pseudorabies virus (PRV) in swine. IDEXX's HerdChek PRVgB Ab Test Kit is a blocking ELISA format.

"This new ELISA is an excellent screening tool for monitoring presumed negative herds with potential exposure to PRV," said Dr. Ricardo Muñoz, Swine and Poultry Marketing Manager. The IDEXX HerdChek PRVgB Antibody Test Kit can be used with IDEXX xChek* software for monitoring antibody status of swine herds. Additionally, IDEXX's HerdChek PRVgB Antibody Test Kit uses the same test protocol as the HerdChek PRVgI Antibody Test Kit, also from IDEXX.

The new IDEXX HerdChek PRVgB Antibody Test Kit is available from IDEXX Europe B.V., a wholly-owned subsidiary of IDEXX. Orders can be placed by calling 31-20-655-23-00, your IDEXX sales representative or your local distributor.

IDEXX distributes a free monthly electronic newsletter providing the latest news on testing trends, products and services for the poultry and livestock industries. To register for this free newsletter, visit www.idexx.com/production/livestockpoultrynews/index.jsp.

IDEXX Laboratories, Inc., is a worldwide leader in the development and commercialization of innovative, technology-based products and services for animal health. The Company's largest business is focused on companion animal health, combining biotechnology, medical device technology and information technology to aid veterinarians in providing better medicine while building successful practices. IDEXX Laboratories is also focused on employing innovative technologies to monitor production animal health and the safety and quality of drinking water and milk. Headquartered in Westbrook, Maine, IDEXX Laboratories employs more than 2,500 people and offers products to customers in more than 100 countries.

This press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. These statements are based on management's current expectations of future events, which are subject to risks and uncertainties. If underlying assumptions prove inaccurate, actual results could vary materially from management's expectations. Risks and uncertainties include timing and success of new product introductions, competition and technological change, government regulation and obtaining government approvals, product demand and market acceptance of products, availability of products and raw materials, and litigation. A further description of these risks and uncertainties and other factors can be found in the Company's Annual Report on Form 10-K for the year ended December 31, 2003 (4,003 KB) and the Quarterly Report on Form 10-Q for the quarter ended March 31, 2004 (2,054 KB), in the section captioned "Management's Discussion and Analysis of Financial Condition and Results of Operations." The Company assumes no obligation to update any forward-looking statements as a result of new information or future events or developments.