Viruses

Feline panleukopenia virus, feline enteric coronavirus, feline rotavirus, feline astroviruses

Bacteria

Salmonella species, Yersinia enterocolitica, Campylobacter jejuni, Clostridium species, Mycobacterium species, Shigella species, Escherichia coli

Protozoa

Isospora species, Sarcocystis species, Besnoitia species, Hammondia species, Toxoplasma species, Giardia species, Trichomonas species, Entamoeba histolytica, Balantidium coli, Cryptosporidium species

Fungi

Histoplasma capsulatum, Aspergillus species, Candida albicans, phycomycetes

Algae

Prototheca species

Parasites

Numerous