| bacillus licheniformis | 78 | species | bacteria | bacteria | 1402 |
| mycoplasma genitalium | 78 | species | bacteria | bacteria | 2097 |
| trichinella spiralis | 78 | species | invertebrates | helminths | 6334 |
| bartonella henselae | 77 | species | bacteria | bacteria | 38323 |
| salmonella enterica subsp. enterica serovar typhimurium | 77 | no rank | bacteria | bacteria | 90371 |
| brucella abortus | 76 | species | bacteria | bacteria | 235 |
| pseudomonas stutzeri | 76 | species | bacteria | bacteria | 316 |
| candida tropicalis | 76 | species | plants | fungi | 5482 |
| sars coronavirus | 76 | no rank | viruses | viruses | 227859 |
| [enterobacter] aerogenes | 75 | species | bacteria | bacteria | 548 |
| francisella tularensis | 74 | species | bacteria | bacteria | 263 |
| haemonchus contortus | 74 | species | invertebrates | helminths | 6289 |
| neospora caninum | 72 | species | invertebrates | protozoa | 29176 |
| cowpox virus | 71 | species | viruses | viruses | 10243 |
| citrobacter freundii | 70 | species | bacteria | bacteria | 546 |
| bovine herpesvirus 1 | 70 | species | viruses | viruses | 10320 |
| feline leukemia virus | 69 | species | viruses | viruses | 11768 |
| fasciola hepatica | 68 | species | invertebrates | helminths | 6192 |
| reticuloendotheliosis virus | 68 | species | viruses | viruses | 11636 |
| coxiella burnetii | 67 | species | bacteria | bacteria | 777 |
| mannheimia haemolytica | 67 | species | bacteria | bacteria | 75985 |
| klebsiella oxytoca | 66 | species | bacteria | bacteria | 571 |
| infectious bronchitis virus | 66 | no rank | viruses | viruses | 11120 |
| campylobacter coli | 65 | species | bacteria | bacteria | 195 |
| pasteurella multocida | 65 | species | bacteria | bacteria | 747 |
| ascaris suum | 65 | species | invertebrates | helminths | 6253 |
| canine parvovirus | 65 | no rank | viruses | viruses | 10788 |
| parainfluenza virus 5 | 65 | no rank | viruses | viruses | 2905673 |
| bovine leukemia virus | 65 | species | viruses | viruses | 11901 |
| borna disease virus | 65 | species | viruses | viruses | 12455 |
| porcine reproductive and respiratory syndrome virus | 65 | species | viruses | viruses | 28344 |
| porcine circovirus | 65 | species | viruses | viruses | 46221 |
| bluetongue virus | 64 | species | viruses | viruses | 40051 |
| enterococcus hirae | 63 | species | bacteria | bacteria | 1354 |
| gallid herpesvirus 2 | 63 | species | viruses | viruses | 10390 |
| chlamydia psittaci | 63 | species | bacteria | bacteria | 83554 |
| chlamydia abortus | 63 | species | bacteria | bacteria | 83555 |
| anaplasma phagocytophilum | 62 | species | bacteria | bacteria | 948 |
| streptococcus agalactiae | 62 | species | bacteria | bacteria | 1311 |
| equine infectious anemia virus | 62 | species | viruses | viruses | 11665 |
| echinococcus granulosus | 61 | species | invertebrates | helminths | 6210 |
| equine arteritis virus | 61 | species | viruses | viruses | 11047 |
| visna/maedi virus | 61 | species | viruses | viruses | 11741 |
| equid herpesvirus 1 | 60 | species | viruses | viruses | 10326 |
| infectious bursal disease virus | 60 | species | viruses | viruses | 10995 |
| transmissible gastroenteritis virus | 60 | no rank | viruses | viruses | 11149 |
| canine distemper virus | 60 | species | viruses | viruses | 11232 |
| chicken anemia virus | 60 | species | viruses | viruses | 12618 |
| actinobacillus pleuropneumoniae | 59 | species | bacteria | bacteria | 715 |
| myxoma virus | 59 | species | viruses | viruses | 10273 |
| lelystad virus | 59 | no rank | viruses | viruses | 11049 |
| feline calicivirus | 59 | species | viruses | viruses | 11978 |
| encephalitozoon cuniculi | 58 | species | plants | fungi | 6035 |
| rotavirus a | 58 | species | viruses | viruses | 28875 |