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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Yes. A proxy for an extinct species could carry pathogens, become vulnerable to unfamiliar diseases, or cause ecological harm after release. None of those outcomes is automatic: risk depends on the organism, its health and traits, the release location, and how that environment has changed. The IUCN SSC treats disease and ecological effects as distinct risks that need case-specific assessment before any release.
What “revived species” means for risk
De-extinction efforts may create a proxy that resembles an extinct species rather than recreate the original organism in every respect. A proxy can differ genetically or behaviorally, and captive rearing can shape its exposure history and behavior. The surrounding habitat and species community may also have changed since the extinct species disappeared. These differences matter when predicting how the organism will interact with pathogens and the ecosystem. IUCN SSC’s 2016 guiding principles frame the issue around proxies and their proposed release settings.
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How disease could spread—or affect the proxy
Disease risk is not limited to an animal bringing a familiar infection into a new place. IUCN SSC states: “No organism can be or remain entirely free of infection with micro-organisms or parasites.” That is a general warning about translocation, not evidence that a particular proxy is infected.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitches- Pathogens or parasites travel with release candidates. Infections may be passed to wildlife at the destination. Health status and exposure history, including exposure in captive facilities, should therefore be assessed.
- The proxy encounters unfamiliar disease. A proxy may be susceptible to pathogens it has not encountered. Specialized pathogens or parasites associated with the extinct species may also have disappeared along with it.
- A new host relationship develops. A proxy could form a novel relationship with a disease-causing agent and potentially act as a vector for a pathogen it did not historically transmit. This is a possible pathway, not proof that a de-extinction project has created such a vector.
- Ancient genetic material raises a question for assessment. IUCN’s principles flag the possible inadvertent resurrection of endogenous retroviruses in genomes. That risk consideration is not evidence that a dangerous ancient pathogen has been revived.
The principles recommend beginning disease-risk assessment during planning and matching its depth to the estimated likelihood and severity of pathogens of concern. General guidance does not specify a universal test panel; relevant checks depend on the organism, location, and potential infections.
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When could a proxy be considered invasive?
“Invasive” does not simply mean non-native, newly created, or released. The IUCN definition concerns an organism introduced outside its natural range that establishes and causes negative impacts on biodiversity, ecosystem services, or human economy and well-being. A proxy is therefore not automatically invasive because it has been revived. The question is whether it establishes and causes harm in the particular proposed setting. See the IUCN overview of invasive alien species.
IUCN’s de-extinction guidance warns that a proxy could become invasive if its establishment and growth cause environmental, economic, or health damage. Effects may emerge long after release. They could be associated with traits arising from proxy creation or rearing, or with changes in the ecosystem since the species disappeared. Even a genetically identical proxy could threaten biodiversity if its former range has changed.
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Disease introduction and invasiveness are separate questions. An organism could cause ecological damage without spreading disease, or carry an infection without becoming invasive.
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IUCN SSC identifies several factors that can increase the risk of releasing a proxy. They are comparison points for an assessment, not a formula that produces a probability:
- Differences from the extinct form: genetic distance, possible novel traits, and behavior shaped by captive rearing.
- Time and habitat change: how long the species has been absent and how much the proposed release environment has changed.
- Health and exposure: pathogens and parasites of concern, the candidates’ health status, and possible transmission to resident wildlife.
- Ecological interactions: likely effects on existing species and ecosystem functions, including the importance of interactions the proxy would need to perform.
- Consequences and reversibility: possible harm to biodiversity or people, whether it can be remedied, and whether monitoring and contingency plans are in place.
- Learned behavior: the extent to which the proxy must learn critical behaviors before it can survive and interact safely in the wild.
The IUCN SSC’s 2016 principles also identify unacceptable ecological impacts and negative effects on human interests as factors to weigh. A longer absence, greater environmental change, or more consequential ecological interactions can make assumptions based on the extinct species’ former range less reliable.
What safeguards should an assessment consider?
IUCN guidance supports case-by-case assessment rather than reliance on one test or containment measure as a guarantee. The IUCN’s 2013 Guidelines for Reintroductions and Other Conservation Translocations address the justification, design, and implementation of conservation translocations generally. Its 2025 Policy on Synthetic Biology in relation to Nature Conservation calls for assessment of intended and unintended effects, in the short and long term, alongside characteristics of the receiving environment. It also calls for monitoring and contingency plans where needed.
- Assess before release planning is locked in. Identify plausible disease, ecological, and invasion risks early enough to shape the project and its proposed location.
- Match health review to the case. Evaluate infections and diseases of concern, health status, and exposure history with appropriate veterinary expertise. IUCN SSC’s July 2025 Guidelines on Responsible Translocation of Displaced Organisms provide relevant general translocation context; they are not a de-extinction-specific protocol.
- Evaluate the receiving ecosystem. Consider resident species, ecosystem functions, environmental change, and how the proxy’s traits and behavior could affect them.
- Plan for monitoring and response. Set out how possible effects will be detected, what outcomes would trigger action, and what contingency measures are available. Consider whether harm could be reversed or remediated.
The appropriate protocol depends on the organism, pathogens of concern, location, release design, legal framework, and available veterinary and ecological expertise. IUCN guidance is technical and policy guidance; binding legal requirements depend on jurisdiction.
What the available evidence cannot tell us
For an unspecified species and release site, there is no supported numeric probability of disease spillover or invasion. The cited guidance identifies pathways and factors to assess, not the likelihood that a particular proposal will cause harm. It also does not establish an incident rate for de-extinction releases.
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Invasive alien species provide context, not a proxy-specific forecast: the IUCN topic page attributes to the 2022 IUCN Red List the estimate that invasive alien species threaten 1 in 10 Red List species. It also attributes to Diagne and colleagues’ 2021 analysis a minimum economic cost of biological invasions of USD 1.288 trillion over 1970–2017. Neither figure estimates the probability or cost of a revived species becoming invasive.
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