Abstract: The present invention broadly relates to a therapeutic agent effective in mitigating disease associated with Feline Leukemia Virus (FeLV) in a feline infected with FeLV. A feline is an animal of the family Felidae. The novel therapeutic agent is composed of feline excised lymph nodes which have been subjected to mitogenic stimulation for their expansion dispersed in a pharmaceutically-acceptable carrier. Mitogenic stimulation conditions include culturing the excised lymph nodes in the presence of Interleukin-2. Optionally, culture conditions can include the presence of allogeneic or autologous FeLV tumor. The inventive therapeutic agent is prepared by excising lymph nodes from a feline infected the FeLV, mitogenically stimulating said excised lymph nodes for their expansion, and administering to the infected feline the expanded lymph nodes. Multidose regimens can be used as is necessary or desirable in convenient fashion.

Abstract: A vaccine for the prevention of disease caused by feline infectious peritonitis virus (FIPV) which comprises FIP viral precursor immunogens derived from in vitro produced cells persistently infected with FIPV. A method of producing FIP viral precursor immunogens is disclosed which comprises culturing in vitro FIP-persistently infected cells in a serum-containing growth medium, subsequently transferring and maintaining said cultured cells in a serum-free medium under conditions for a time adequate to accumulate FIP viral precursor immunogens shed from said cells, and then separating the cells from the supernatant containing the viral precursor immunogens. Any live virus present in the mixture is inactivated and the supernatant containing the FIP viral precursor immunogens is blended with a pharmaceutically-acceptable adjuvant in order to form the FIP vaccine disclosed herein.

Abstract: One aspect of the present invention comprises a vaccine for the prevention of disease caused by feline infectious peritonitis virus (FIPV). Such vaccine comprises FIP viral precursor immunogens derived from in vitro produced cells persistently infected with FIPV. Preferred in the production of viral immunogens forming the vaccine of the present invention is the Crandall Feline Kidney (CrFK) cell line. Thus, a second aspect of the invention comprises FIP-infected Crandall Feline Kidney cell line, deposited at the American Type Culture Collection (ATCC), Rockville, MD, on Sep. 23, 1992, and granted Accession No. CRL11137.

Abstract: Disclosed is a vaccine for the prevention of disease caused by canine distemper virus (CDV). The vaccine is prepared from CDV immunogens derived from CDV persistently-infected cells cultured in vitro. CCL-64 mink lung cells are the preferred cell line. CDV persistently-infected cells are cultured in serum-containing growth medium, the cells transferred and maintained in serum-free medium under conditions and for a time adequate to accumulate in said serum-free medium said CDV immunogens, and the cells separated from said CDV immunogen-containing supernatant. The CDV vaccine is made by diluting said supernatent and blending with a pharmaceutically-acceptable adjuvant.