* Feline leukemia virus (FeLV)
* Feline immunodeficiency virus (FIV)
* Rabies virus
* Canine distemper virus
* Influenza virus
* Herpesvirus
Bacterial diseases
* Bartonella spp.
* Bordetella bronchiseptica
* Chlamydophila felis
* Mycoplasma spp.
* Pasteurella multocida
* Salmonella spp.
* Staphylococcus aureus
* Streptococcus spp.
Protozoal diseases
* Giardia spp.
* Cryptosporidium spp.
* Toxoplasma gondii
Fungal diseases
* Microsporum canis
* Trichophyton mentagrophytes