Best articles I've come up to so far...
https://coronavirusexplained.ukri.org/en.... Referencing:
Addie D, Belk S, Boucraut-Baralon C, et al. Feline infectious peritonitis. ABCD guidelines on prevention and management. Journal of Feline Medicine and Surgery. 2009 Jul;11(7):594-604. DOI: 10.1016/j.jfms.2009.05.008.
Takano T, Kawakami C, Yamada S, Satoh R, Hohdatsu T. Antibody-dependent enhancement occurs upon re-infection with the identical serotype virus in feline infectious peritonitis virus infection. The Journal of Veterinary Medical Science. 2008 Dec;70(12):1315-1321. DOI: 10.1292/jvms.70.1315.
Vennema H, de Groot RJ, Harbour DA, et al. Early death after feline infectious peritonitis virus challenge due to recombinant vaccinia virus immunization. Journal of Virology. 1990 Mar;64(3):1407-1409.
Olsen CW. A review of feline infectious peritonitis virus: molecular biology, immunopathogenesis, clinical aspects, and vaccination. Veterinary Microbiology. 1993 Jul;36(1-2):1-37. DOI: 10.1016/0378-1135(93)90126-R.
I have not read any of these yet.