Oral - Bacteria, parasites, viruses that can be introduced by mouth include:
| Anthrax | Avian Influenza | Bovine Papular Stomatitis | Brucellosis | Campylobacteriosis | Caseous lymphadenitis | Cryptosporidiosis | Enzootic Abortion | Erysipelas | Foot and Mouth Disease | Giardiasis | Leptospirosis | Listeriosis | Q fever | Rabies | Salmonellosis | Strangles | Vesicular Stomatitis |

Fecal / oral - Bacteria, parasites, viruses that can be introduced by mouth through contamination of food and water with feces include:
| Avian Influenza | Campylobacteriosis | Cryptosporidiosis | Erysipelas | Foot and Mouth Disease | Giardiasis | Leptospirosis | Listeriosis | Exotic Newcastle | Salmonellosis |

Aerosol - Bacteria and viruses transmitted thru the air that is contaminated with bacteria and viruses:
| Anthrax | Atrophic Rhinitis | Avian Influenza | Caseous lymphadenitis | Enzootic Abortion| Foot and Mouth Disease | Exotic Newcastle | Q fever |

Direct Physical Contact - Bacteria, parasites, viruses, fungi may spread to people and other animals through contact with; hair, feces, urine, saliva or by bites and scratches.
| Anthrax | Atrophic Rhinitis | Avian Influenza | Bovine Papular Stomatitis | Brucellosis | Caseous lymphadenitis | Cryptosporidiosis | Enzootic Abortion | Foot and Mouth Disease | Lice | Mange | Exotic Newcastle | Pseudocowpox | Q fever | Rabies | Ringworm | Sore Mouth | Strangles | Vesicular Stomatitis | Warts |

Insect vectors: Fleas, ticks, mosquitoes and other biting insects that are infected with viruses may spread the disease when they bite people or animals.
| Blue Tongue | Vesicular Stomatitis | West Nile Virus |