| west nile virus | 97 | species | viruses | viruses | 11082 |
| classical swine fever virus | 84 | species | viruses | viruses | 11096 |
| bovine viral diarrhea virus 1 | 80 | species | viruses | viruses | 11099 |
| hepatitis c virus | 289 | species | viruses | viruses | 11103 |
| infectious bronchitis virus | 66 | no rank | viruses | viruses | 11120 |
| transmissible gastroenteritis virus | 60 | no rank | viruses | viruses | 11149 |
| newcastle disease virus | 93 | species | viruses | viruses | 11176 |
| parainfluenza virus 5 | 65 | no rank | viruses | viruses | 2905673 |
| canine distemper virus | 60 | species | viruses | viruses | 11232 |
| measles virus | 119 | species | viruses | viruses | 11234 |
| rabies virus | 96 | species | viruses | viruses | 11292 |
| influenza a virus | 135 | species | viruses | viruses | 11320 |
| lymphocytic choriomeningitis mammarenavirus | 148 | species | viruses | viruses | 11623 |
| reticuloendotheliosis virus | 68 | species | viruses | viruses | 11636 |
| equine infectious anemia virus | 62 | species | viruses | viruses | 11665 |
| feline immunodeficiency virus | 80 | species | viruses | viruses | 11673 |
| human immunodeficiency virus 1 | 410 | species | viruses | viruses | 11676 |
| human immunodeficiency virus 2 | 399 | species | viruses | viruses | 11709 |
| visna/maedi virus | 61 | species | viruses | viruses | 11741 |
| mouse mammary tumor virus | 125 | species | viruses | viruses | 11757 |
| feline leukemia virus | 69 | species | viruses | viruses | 11768 |
| murine leukemia virus | 184 | species | viruses | viruses | 11786 |
| bovine leukemia virus | 65 | species | viruses | viruses | 11901 |
| human t-lymphotropic virus 1 | 137 | no rank | viruses | viruses | 11908 |
| feline calicivirus | 59 | species | viruses | viruses | 11978 |
| hepatovirus a | 95 | species | viruses | viruses | 12092 |
| encephalomyocarditis virus | 105 | no rank | viruses | viruses | 12104 |
| foot-and-mouth disease virus | 89 | species | viruses | viruses | 12110 |
| borna disease virus | 65 | species | viruses | viruses | 12455 |
| chicken anemia virus | 60 | species | viruses | viruses | 12618 |
| respiratory syncytial virus | 164 | species | viruses | viruses | 12814 |
| porcine reproductive and respiratory syndrome virus | 65 | species | viruses | viruses | 28344 |
| rotavirus a | 58 | species | viruses | viruses | 28875 |
| salmonella enterica | 107 | species | bacteria | bacteria | 28901 |
| neospora caninum | 72 | species | invertebrates | protozoa | 29176 |
| mycobacterium avium complex | 95 | species | bacteria | bacteria | 37162 |
| human herpesvirus 8 | 140 | species | viruses | viruses | 37296 |
| bartonella henselae | 77 | species | bacteria | bacteria | 38323 |
| bluetongue virus | 64 | species | viruses | viruses | 40051 |
| stenotrophomonas maltophilia | 80 | species | bacteria | bacteria | 40324 |
| porcine circovirus | 65 | species | viruses | viruses | 46221 |
| rhizopus oryzae | 86 | species | plants | fungi | 64495 |
| mannheimia haemolytica | 67 | species | bacteria | bacteria | 75985 |
| escherichia coli o157:h7 | 138 | no rank | bacteria | bacteria | 83334 |
| chlamydia psittaci | 63 | species | bacteria | bacteria | 83554 |
| chlamydia abortus | 63 | species | bacteria | bacteria | 83555 |
| chlamydia pneumoniae | 143 | species | bacteria | bacteria | 83558 |
| salmonella enterica subsp. enterica serovar typhimurium | 77 | no rank | bacteria | bacteria | 90371 |
| fusarium verticillioides | 97 | species | plants | fungi | 117187 |
| enterovirus c | 118 | species | viruses | viruses | 138950 |
| salmonella enterica subsp. enterica serovar enteritidis | 87 | no rank | bacteria | bacteria | 149539 |
| sars coronavirus | 76 | no rank | viruses | viruses | 227859 |
| bovine spongiform encephalopathy agent | 101 | species | | | |
| scrapie agent | 79 | species | | | |