EcoHealth Alliance Identifies Ebola’s Flight Path to the U.S.

NEW YORK – August 14, 2014

Airline Data from Flights Originating in West Africa Show Highest Risk Destinations

EcoHealth Alliance, a nonprofit organization focused on local conservation and global health issues, developed a series of global maps using available airline flight route data to calculate and predict the probable arrival of Ebola hemorrhagic fever virus from infected travelers in West Africa. The data was collected from flight schedules from Liberia, Guinea, Sierra Leone, Morocco, Nigeria and Ghana. The analysis shows that the highest risk countries are the United States and much of Europe. The methods used in this risk analysis were developed by EcoHealth Alliance’s previous examination of the global spread of Influenza A/H1N1 that originated in Mexico in 2009 with findings published in the scientific journal PLoS One.

The Ebola outbreak in West Africa has caused significant concerns over the possible spread from the region. EcoHealth Alliance’s modeling team identified five U.S. airports that had passenger arrivals from affected countries but were not necessarily connected by direct flights. The analysis looked at two or fewer leg journeys from West Africa to determine which U.S. airports were most likely to receive infected travelers from West Africa. In order of risk, they include New York’s JFK International Airport, Washington Dulles International Airport, Hartsfield-Jackson Atlanta International Airport, Houston’s George Bush Intercontinental Airport and Boston Logan International Airport. Last week, the World Health Organization declared the Ebola outbreak in West Africa to be an international public health emergency.

The capacity of diseases to spread via traveling passengers varies significantly and scientists cannot predict the actual date or times of the plausible arrival of the Ebola virus via an infected traveler. Scientists can estimate the relative risk of the virus spreading from country to country by identifying the most direct entry points. EcoHealth Alliance is on the frontlines of predicting and preventing pandemic events globally. The nonprofit’s research spans specific emerging disease ‘hotspots’ regions from Central and South America to South Asia. EcoHealth Alliance has researched over 60 years of disease data to focus its programs, partnerships and capacity building efforts in regions most likely to be the point of origin for new emerging infectious disease outbreaks. Ecological disturbances such as deforestation, intensive agricultural expansion, wildlife trade, and climate change – all human-induced changes to the environment – are driving disease emergence and outbreaks with more frequency. Over the past four decades, approximately 75 percent of emerging infectious diseases affecting people are diseases from an animal origin, and approximately 60 percent of all human pathogens are zoonotic.

“It’s easy to point the finger at wildlife as the reservoirs of disease but the real culprit in this scenario is human interaction with wildlife from bushmeat hunting, illegal wildlife trade, habitat destruction and deforestation,” said Dr. William Karesh, wildlife veterinarian and Executive Vice President of Health and Policy at EcoHealth Alliance.

The global maps prepared by EcoHealth Alliance scientists illustrate how Ebola may spread via international flight routes.  Other countries most at risk include the U.K., Netherlands, Germany, France, Switzerland, Denmark, Portugal, Austria, Ireland, Italy, Spain, Senegal, Ghana, Gambia, Israel, United Arab Emirates, Qatar, and Japan.  “Our initial work identifying the pathways of the 2009 outbreak of Influenza A/H1N1 formed the basis of our approach to understand the plausible routes that Ebola could present as a risk to global communities,” said Dr. Parviez Hosseini, Senior Research Fellow at EcoHealth Alliance.

The global spotlight on the current Ebola outbreak and its pandemic potential, point to a larger issues around zoonotic disease emergence. Human-induced changes to the natural environment are causing rapid and frequent disease emergence. The lack of a unified global approach to public health issues and wildlife conservation is a driving force that requires international action and funding. Diseases such as Malaria, Dengue, Lassa fever, Chikungunya and other vector-borne diseases have collectively infected and caused higher morbidity rates than Ebola has historically – these other diseases require concerted effort to control on a global basis. “Our focus must be on all known zoonotic diseases that threaten human health, not only the outbreaks that garner the most media attention,” said Dr. Peter Daszak, disease ecologist and President of EcoHealth Alliance. “Treating the disease is a necessary reactive response but a proactive approach is clearly needed.  Our predictive modeling tools and expertise allow us to target these diseases before they become a global pandemic on a global scale.”

About EcoHealth Alliance

Building on over 40 years of groundbreaking science, EcoHealth Alliance is a global, nonprofit organization dedicated to protecting wildlife and safeguarding human health from the emergence of disease. The organization develops ways to combat the effects of damaged ecosystems on human and wildlife health.  Using environmental and health data covering the past 60 years, EcoHealth Alliance scientists created the first-ever, global disease hotspots map that identified at-risk regions, to help predict and prevent the next pandemic crisis. That work is the foundation of EcoHealth Alliance’s rigorous, science-based approach, focused at the intersection of the environment, health, and capacity building.  Working in the U.S. and more than 20 countries worldwide, EcoHealth Alliance’s strength is founded on innovations in research, training, global partnerships, and policy initiatives.  For more information, please visit


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