Panleukopenia (also known as feline distemper and infectious feline enteritis) is highly contagious, often fatal parvovirus which causes severe vomiting and diarrhea. (thinkingoutsidethecage.org)
Your cat will need protection against feline enteritis and cat «flu. (cats.org.uk)
Kittens can be vaccinated against a variety of diseases, including feline enteritis virus, cat «flu» (actually 3 different diseases Feline calicivirus, feline herpes virus and Feline chlamydia), feline immunodeficiency virus (FIV) and feline leukaemia virus. (thearkvet.com)