hi maikki,
have u thought of using a search engine & see what it can find about FIP? there are plenty of search engines around (more than my list below).
they often bring up different results. & you may have to refine the results you get by checking their indexes.
you could even type in & check if there is such a thing as a veterinarian search engine, this would most likely get you the best results.
cheerio silhobby