Animals That Transmit Diseases to Humans: A Quick Reference Guide

Many animals act as vectors or reservoirs for human pathogens. Awareness and preventive measures reduce risk.

Animal / Vector	Key Diseases Transmitted	Transmission Route
Mosquitoes	Malaria, Dengue, Zika, Yellow fever, West Nile, Chikungunya	Bite (blood-feeding)
Ticks	Lyme disease, Rocky Mountain spotted fever, Ehrlichiosis, Babesiosis, Tularemia	Bite (attachment >24h for Lyme)
Fleas	Plague (Yersinia pestis), Murine typhus	Bite; contact with infected rodents
Lice (body)	Epidemic typhus, Trench fever, Relapsing fever	Close contact; contaminated clothing
Rodents (rats, mice)	Leptospirosis, Hantavirus, Plague, Lassa fever, Salmonellosis	Urine/feces aerosol, bite, contaminated food
Dogs	Rabies, Capnocytophaga, Pasteurella	Bite, saliva contact
Cats	Toxoplasmosis, Cat-scratch disease (Bartonella), Rabies	Feces (oocysts), scratch/bite
Snakes	Venomous envenomation (not infectious)	Bite
Spiders	Venomous envenomation (necrotic/neurotoxic)	Bite
Scorpions	Venomous envenomation	Sting
Bees/Wasps	Venom allergy (anaphylaxis)	Sting

Prevention Essentials

• Vector control: repellents (DEET, picaridin), permethrin-treated clothing, bed nets.
• Rabies: vaccinate pets; post-exposure prophylaxis after any mammal bite.
• Food/water safety: cook meat thoroughly; avoid rodent-contaminated supplies.
• Hygiene: handwashing after animal contact; litter box precautions in pregnancy.
• Prompt medical care for bites/stings with signs of infection or systemic symptoms.