Reverse zoonosis
Human-to-animal pathogen transmission, a reverse of zoonosis.
A reverse zoonosis, also known as a zooanthroponosis or anthroponosis, is a pathogen reservoired in humans that is capable of being transmitted to non-human animals. This concept contrasts with zoonosis, the transmission of a pathogen from nonhuman animals to humans, and highlights the bidirectional nature of infectious disease exchange between species.
- definition
- Pathogen reservoired in humans transmitted to non-human animals
- synonyms
- Zooanthroponosis, anthroponosis
- contrast
- Zoonosis (animal to human)
- etymology
- Greek zoon 'animal', anthropos 'man', nosos 'disease'
Lore & Background
The term reverse zoonosis, also called zooanthroponosis or anthroponosis, describes pathogens that originate in humans and can infect non-human animals. Anthroponosis can also include human-to-human transmission, adding further complexity.
Reader's Guide
Reverse zoonosis is significant because it challenges the human-centered bias in disease classification, revealing that pathogens can cycle between humans and animals in both directions. The article notes that diseases like malaria, African sleeping sickness, and arboviruses (e.g., yellow fever, dengue, Zika) can involve reverse zoonotic transmission, where infected humans pass pathogens to arthropod vectors or other animals, which may then reinfect humans or sustain sylvatic cycles. This bidirectional flow complicates disease control, as seen with Trypanosoma brucei gambiense in African sleeping sickness, where human-to-livestock transmission may maintain reservoirs. The concept also intersects with sapronoses, where pathogens replicate in abiotic environments, though obligate intracellular parasites cannot be sapronotic agents. Understanding reverse zoonosis is crucial for predicting spillback events and managing emerging infectious diseases.
Did You Know?
- Reverse zoonosis is also known as zooanthroponosis or anthroponosis.
- Malaria can involve reverse zoonosis when a human infects a mosquito, which then infects another human or non-human primate.
- Obligate intracellular parasites like viruses cannot be sapronotic agents because they cannot replicate outside cells.
Frequently Asked Questions
What is a reverse zoonosis?
A reverse zoinosis is the spread of a pathogen from humans (who act as the reservoir) to non-human animals. It is the mirror image of the more familiar animal-to-human disease transfer.
What are the alternative names for reverse zoonosis?
Epidemiologists also call it zooanthroponosis or simply anthroponosis. All three labels point to the same human-to-animal direction of pathogen transmission.
How does reverse zoonosis differ from a regular zoonosis?
A standard zoonosis describes a pathogen jumping from an animal into a human host, whereas a reverse zoonosis describes the opposite flow from humans into animals. Recognizing both directions shows that cross-species disease exchange is inherently bidirectional.
What do the Greek roots behind the term mean?
The components zoon (animal), anthropos (human), and nosos (disease) encode the idea of illness moving between human and animal populations. Adding 'reverse' simply flips the default animal-to-human direction implied by the word zoonosis.
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