Zoonotic Threats from Wildlife: Emerging Risks and Global Implications

Wild animals harbor a wide array of pathogens and act as natural reservoirs, living in complex ecosystems that allow diseases to persist and spread. These wildlife-borne pathogens not only threaten animal populations, including endangered species, but also pose significant risks to human health. In fact, over 60% of emerging infectious diseases in humans originate from animals, with nearly 72% coming specifically from wildlife. Migration patterns of wild animals and birds further facilitate the global spread of diseases, often aided by vectors like ticks and mosquitoes.

---

Viral Zoonoses

Viral diseases transmitted from wildlife include avian influenza, AIDS, COVID-19, Monkeypox, and hemorrhagic fever with renal syndrome. Historical pandemics such as influenza, HIV, and COVID-19 highlight shared factors in disease emergence and the importance of interventions, both pharmaceutical and non-pharmaceutical.

Studies of avian influenza subtypes like H11N3, H5N8, and H3N2 reveal their ability to infect mammals, adapt across species, and reassort genetically. These findings underscore the pandemic potential of rare influenza strains and the need for continuous surveillance. Similarly, COVID-19 research demonstrates variations in immune responses between asymptomatic and symptomatic patients, showing how pathogen-host interactions can shape disease severity. Other viruses, including Monkeypox and tick-borne encephalitis virus, illustrate the risks of localized outbreaks expanding geographically, emphasizing the importance of vaccines, antiviral treatments, and rapid detection.

Bacterial Zoonoses

Rodents and other wildlife can carry zoonotic bacteria like Bartonella and Yersinia pseudotuberculosis. Surveillance in rodents has revealed multiple species of Bartonella with human infection potential, highlighting public health risks. Novel antibacterial strategies, such as Ebselen combined with silver nitrate, have shown promising results in reducing bacterial loads and modulating immune responses, offering potential therapeutic options.

Parasitic Zoonoses

Parasitic infections, such as alveolar echinococcosis caused by Echinococcus multilocularis, continue to challenge human and animal health. Current drugs like albendazole can limit parasite growth but have high toxicity and limited curative effects. Research on Pseudolaric acid B (PAB) shows effective anti-parasitic activity with lower toxicity, suggesting it may be a safer and more effective alternative for treatment.

Conclusion

Pathogens from wildlife can rapidly evolve when introduced to new hosts, sometimes acquiring traits that increase their virulence and transmissibility. Wildlife migration enables these pathogens to spread locally and globally, while vectors like ticks and mosquitoes amplify disease transmission. Understanding these dynamics is crucial for implementing effective surveillance, prevention, and treatment strategies, ultimately reducing the public health risks posed by wildlife-borne zoonoses.

References

1. Chai, H., Liu, Q., Gaudreault, N. N., & Zhang, W. (2023). Editorial: Zoonotic diseases originating from wildlife: Emergence/re-emergence, evolution, prevalence, pathogenesis, prevention, and treatment. Frontiers in microbiology, 14, 1165365. https://doi.org/10.3389/fmicb.2023.1165365

2. sphweb. (2025, October 10). Wild Warnings: The Rise of Animal-borne Diseases - Fall 2025 - Advances Magazine - School of Public Health - University of Minnesota. Advances Magazine. https://advances.umn.edu/fall-2025/wild-warnings-the-rise-of-animal-borne-diseases/

Assessed and Endorsed by the MedReport Medical Review Board