Cambridge Biotech Corp. on Wednesday said it has signed adefinitive agreement with Virbac Laboratories SA to develop arecombinant vaccine against feline immunodeficiency virus(FIV), a retrovirus that affects cats.

Virbac of Carrons Cedex, France, will fund the development ofthe vaccine. No other terms were disclosed.

No vaccine exists for FIV, which infects from 1 percent to 3percent of the 55 million cats in the United States.

This is the second agreement between Cambridge and Virbac.The companies have developed a vaccine for feline leukemiavirus (FeLV), which went on the market in France andSwitzerland in 1989 and in the United States in 1990.

Cambridge (NASDAQ:CBCX) estimated it will gross $2 millionto $3 million from FeLV in 1991. It estimated an eventualworld market of $50 million to $75 million.

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