ONE HEALTH - Action Track 2
Reducing the risks from emerging and re-emerging zoonotic epidemics and pandemics
ONE HEALTH: A Comprehensive Approach for Addressing Health Threats at the Human-Animal-Environment Interface
Action Track 2, titled “Reducing the risks from emerging and re-emerging zoonotic epidemics and pandemics,” is an integral component of the efforts by PAHO, Member States, and international partners to enhance surveillance, preparedness, and response to pathogens with epidemic and pandemic potential. As most of these pathogens have an animal reservoir and vector, these efforts must be conducted at the human-animal-environmental interface.
The Region of the Americas is at great risk for the emergence and reemergence of zoonotic pathogens. The ecologically diverse Amazon basin and Darien Gap harbor a myriad of potentially emerging pathogens, with animals as possible reservoirs and vectors. The spillover risk to human populations is ever-increasing because of factors such as the encroachment of human settlements in sylvatic areas, unplanned urbanization, and the potential impact of climate change and more frequent extreme weather events. For instance, epizootic spread of the yellow fever virus reached during 2016–2019 the southeast coast of Brazil for the first time, causing spillover human infections in densely populated areas. The investigation of a hemorrhagic fever cluster in Bolivia in 2019 eventually revealed the reservoir of the etiological pathogen (Chapare virus) in an autochthonous rodent species, with which rural workers come in contact. Avian influenza A(H5N1) virus has been spreading since 2014 in the Americas in wild birds as well as farm and domestic poultry. As of January 2024, spillover infections have been reported in wildlife mammals in six countries (e.g., red foxes and skunks in North America, and fur seals in South America), and three human cases have been identified between April 2022 and March 2023 in the United States, Ecuador, and Chile, respectively.
Along the human-animal-environmental interface, PAHO works together with Member States and international partners to develop and implement preparedness and response plans, epidemiologic/virologic/genomic surveillance systems, laboratory diagnostic and reference services and their networking, biosafety and biosecurity, and capacities on clinical management and infection prevention and control. In addition, PAHO forecasts and characterizes infection and disease risks, including in potential animal and wildlife reservoirs, and develops evidence-based strategies to predict, prevent, detect, and respond to zoonotic hazards. All these actions are also achieved through expert networks to leverage international expertise and to foster regional knowledge-sharing and collaboration, as well as by providing secretariat support to regional and global initiatives.
Partnerships
- PAHO/WHO Collaborating Centers
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, United Sates of Americas (WHO Collaborating Centre for Arthropod-Borne Viruses Reference and Research)
- Instituto de Diagnóstico y Referencia Epidemiológicos (InDRE) “Dr. Manuel Martínez Báez”, Ministry of Health, Mexico City, Mexico (WHO Collaborating Centre for Arboviruses)
- Instituto Evandro Chagas, Ministério da Saúde, Manaus, Brazil (WHO Collaborating Centre for Emerging and Re-emerging Arboviruses and other Emerging Zoonotic Viruses)
- Instituto Nacional de Enfermedades Virales Humanas, Pergamino, Argentina (WHO Collaborating Centre for Reference and Research of Arbovirus and Hemorrhagic Fevers Virosis)
- St. Jude Children's Research Hospital, University of Tennessee, Memphis, United States of America (WHO Collaborating Centre for Studies on the Ecology of Influenza in Animals)
- Viral Special Pathogens Branch, Centers for Disease Control and Prevention, Atlanta, United Sates of Americas (WHO Collaborating Centre for Viral Hemorrhagic Fevers)
- Global Outbreak Alert and Response Network (GOARN)
- World Organization for Animal Health (WOAH/OIE)
- UN food and Agriculture Organization (FAO)
- Global early warning system for major animal diseases including zoonoses (GLEWS)
- OIE/FAO Network of Expertise on Animal Influenza (OFFLU)
Best practices
- Establishment and strengthening of regional surveillance networks and communities of practice
- Severe Acute Respiratory Infections Network (SARInet plus)
- COVID-19 Genomic Surveillance Regional Network (COVIGEN)
- Arbovirus Diagnosis Laboratory Network of the Americas (RELDA)
- Genomic Surveillance of Dengue Virus in the Americas (ViGenDA)
- Regional Entomo-Virological Laboratory Network (RELEVA)
- Preparedness and Resilience for Emerging Threats (PRET) initiative in the Americas
- Generate and disseminate information on epidemic-prone disease occurrence
- Systematization of national experiences into best practices through regional and ad hoc expert consultations
- Taller regional de lecciones aprendidas sobre la preparación y la respuesta durante la pandemia de COVID-19 en la Región de las Américas, Buenos Aires, 16–19 August 2022 (in Spanish)
- Regional consultation for the strengthening of intersectoral work in the human-animal interface of influenza, Rio de Janeiro, 14–16 March 2023
Courses on the PAHO Virtual Campus
Course on respiratory protection in health-care settings, 2024 (upcoming)