Which disease is primarily associated with aerosols from infected animals?

Which disease is primarily associated with aerosols from infected animals?

• A. Plague
• B. Brucellosis
• C. Coxiella burnetii
• D. Anthrax

Answer: (C)

Aerosol transmission from infected livestock is the hallmark of disease caused by Coxiella burnetii. Infected goats, sheep, and cattle shed large amounts of the organism in birth products, urine, milk, and feces. The bacteria can persist in dust and travel through air as tiny particles, so people working with these animals or in environments with birthing events can inhale enough of the organism to become infected, often with only a small exposure. This inhalational route is why Q fever is classically tied to aerosols from livestock and is a common occupational hazard for farmers, veterinarians, and slaughterhouse workers. Prevention focuses on minimizing exposure during birthing, using protective equipment, and, in some settings, vaccinating animals to reduce shedding. Plausible alternative transmissions for the other diseases don’t center on aerosols from everyday animal exposure. Plague is primarily vector-borne by fleas and can spread via respiratory droplets in pneumonic cases, rather than through routine aerosols from infected animals. Anthrax involves inhalation of spores from contaminated animal products or soil, not general aerosols from infected animals. Brucellosis mainly transmits through direct contact with infected animals or consumption of unpasteurized dairy.

Aerosol transmission from infected livestock is the hallmark of disease caused by Coxiella burnetii. Infected goats, sheep, and cattle shed large amounts of the organism in birth products, urine, milk, and feces. The bacteria can persist in dust and travel through air as tiny particles, so people working with these animals or in environments with birthing events can inhale enough of the organism to become infected, often with only a small exposure. This inhalational route is why Q fever is classically tied to aerosols from livestock and is a common occupational hazard for farmers, veterinarians, and slaughterhouse workers. Prevention focuses on minimizing exposure during birthing, using protective equipment, and, in some settings, vaccinating animals to reduce shedding.

Plausible alternative transmissions for the other diseases don’t center on aerosols from everyday animal exposure. Plague is primarily vector-borne by fleas and can spread via respiratory droplets in pneumonic cases, rather than through routine aerosols from infected animals. Anthrax involves inhalation of spores from contaminated animal products or soil, not general aerosols from infected animals. Brucellosis mainly transmits through direct contact with infected animals or consumption of unpasteurized dairy.