WHO’s Polaris II Exercise Tests Global Pandemic Preparedness with 26 Nations

Global health preparedness took center stage this month as the World Health Organization (WHO) concluded its largest-ever pandemic simulation exercise, testing international coordination in the face of a fictional but alarmingly realistic disease outbreak. Exercise Polaris II, held on April 22 and 23, 2026, brought together 26 countries and territories, 600 health emergency experts, and over 25 partner organizations to simulate the rapid spread of a novel bacterial pathogen across borders. The two-day drill provided a critical opportunity to evaluate emergency response frameworks, workforce mobilization, and cross-border collaboration under real-world conditions.

Testing Global Readiness for the Next Pandemic

The exercise built on the success of Polaris I, conducted in April 2025, which focused on a fictional viral outbreak. While the first iteration involved 15 countries, Polaris II expanded participation to include nations from all six WHO regions, reflecting growing recognition of the need for collective action in health emergencies. Each participating country activated its national emergency coordination structures, working under simulated real-life conditions to share information, align policies, and deploy surge teams.

The simulation centered on two key WHO frameworks: the Global Health Emergency Corps (GHEC), published in June 2025, and the National Health Emergency Alert and Response Framework, released in October 2025. The GHEC framework provides guidance for strengthening health workforces during emergencies, emphasizing principles of sovereignty, equity, and solidarity. It aims to improve collaboration by facilitating information exchange and deploying regional and global emergency personnel when needed. The national framework, meanwhile, outlines coordination systems and actions required for effective response at local, sub-national, and national levels.

Dr. Tedros Adhanom Ghebreyesus, WHO Director-General, emphasized the exercise’s significance in demonstrating the necessity of global cooperation. In a statement following the simulation, he said, Exercise Polaris II showed what is possible when we act together. It demonstrated that global cooperation is not optional – it is essential. This is the purpose of the Global Health Emergency Corps: coordination across the emergency workforce, building trust, strengthening connections, and working as one across borders.

A Real-World Test of Emergency Frameworks

Polaris II was not merely a theoretical exercise. Participants engaged in hands-on testing of emergency protocols, including the activation of workforce structures, information-sharing mechanisms, and coordination with international partners. The simulation also explored the use of AI-enabled tools to support workforce organization and planning, reflecting the growing role of technology in public health preparedness.

Edenilo Baltazar Barreira Filho, Director of the Public Health Emergencies Department at Brazil’s Ministry of Health, highlighted the practical value of the exercise. By simulating the spread of a dangerous pathogen under real-life conditions, Exercise Polaris II helped us turn existing plans into action. It is not enough to have plans on paper – what matters is how they perform in practice, he said. His remarks underscored the gap between theoretical preparedness and real-world execution, a challenge that the simulation aimed to address.

The exercise also provided a platform for practicing coordinated technical support and surge assistance. Over 25 national, regional, and global health agencies and organizations participated, including the Africa Centres for Disease Control and Prevention (Africa CDC), the International Federation of Red Cross and Red Crescent Societies (IFRC), Médecins Sans Frontières (MSF), the Robert Koch Institute, UK-Med, UNICEF, and emergency networks such as the Global Outbreak Alert and Response Network (GOARN) and the Emergency Medical Teams (EMT) initiative. These partnerships demonstrated the importance of a unified response in managing large-scale health emergencies.

Expanding Participation and Strengthening Networks

Polaris II saw broader participation than its predecessor, with 26 countries and territories taking part, including Bangladesh, Brazil, Brunei, Colombia, Egypt, El Salvador, France, Georgia, Ghana, India, Indonesia, Jordan, Kenya, Kosovo, Libya, Malaysia, Nepal, Oman, Paraguay, the Philippines, Qatar, the Republic of Congo, Rwanda, Suriname, Thailand, and Yemen. The exercise also incorporated new networks, such as the recently launched Health Emergency Leaders Network for Africa and the Eastern Mediterranean, which aims to enhance regional collaboration in health crisis management.

Dr. Chikwe Ihekweazu, Executive Director of WHO’s Health Emergencies Programme, praised the exercise for showcasing the readiness of the global health workforce. Exercise Polaris II showed what it looks like when countries are prepared and ready to act together. This reflects the spirit of the Global Health Emergency Corps: a well-organized, trained, coordinated and connected emergency workforce ready to respond wherever and whenever it is needed, he said.

Part of a Broader Strategy for Global Health Security

Exercise Polaris II is a component of HorizonX, WHO’s multi-year simulation exercise program. The initiative is designed to operationalize and practice emergency frameworks under realistic conditions, ensuring that global preparedness is not a one-time effort but a continuous investment in health security. By conducting regular simulations, WHO aims to identify gaps in preparedness, refine coordination mechanisms, and build trust among participating nations and organizations.

The exercise also comes at a time when global health systems continue to grapple with the lessons of the COVID-19 pandemic. The rapid spread of SARS-CoV-2 exposed vulnerabilities in international coordination, workforce deployment, and information-sharing, prompting calls for stronger, more resilient systems. Polaris II represents a step toward addressing these challenges by fostering collaboration and testing response mechanisms before a real crisis emerges.

Looking Ahead: The Role of Technology and Innovation

One of the notable aspects of Polaris II was its exploration of AI-enabled tools to support emergency response. While the specifics of these tools were not detailed in the exercise summary, their inclusion reflects a growing trend in public health: the integration of technology to enhance decision-making, workforce allocation, and logistical planning. AI has the potential to analyze vast amounts of data in real time, predict outbreak trajectories, and optimize resource distribution, though its implementation in health emergencies remains an evolving field.

The use of such tools also raises questions about data privacy, equity in access, and the need for standardized protocols. As WHO and its partners continue to refine these technologies, ensuring they are accessible to low- and middle-income countries will be critical to achieving truly global health security.

The Path Forward for Global Health Preparedness

While Exercise Polaris II provided valuable insights into the strengths and weaknesses of current emergency response frameworks, it also highlighted areas for improvement. The simulation revealed the importance of clear communication channels, rapid decision-making, and the ability to deploy resources swiftly across borders. However, it also underscored persistent challenges, such as disparities in health infrastructure, varying levels of preparedness among nations, and the need for sustained political and financial commitment to global health security.

For WHO and its partners, the next steps will likely involve analyzing the data and feedback from the exercise to refine the Global Health Emergency Corps and other frameworks. This may include developing targeted training programs, expanding regional networks, and advocating for increased investment in health emergency preparedness at the national and international levels.

As the world continues to face emerging health threats—from antimicrobial-resistant pathogens to climate-sensitive diseases—the lessons from Polaris II serve as a reminder that preparedness is not a static goal but an ongoing process. The exercise demonstrated that while no single country can tackle a global health crisis alone, coordinated action can make a decisive difference. In the words of Dr. Tedros, Together for health. Stand with science—a theme that resonates as WHO and its partners work to build a safer, healthier future for all.