Absolute Beginner

Ebola is a very dangerous disease. It spreads from person to person. It can kill many people quickly.

There is an outbreak of Ebola in Africa right now. An outbreak means many people are getting sick in the same place at the same time.

More than 136 people have died in the outbreak. It started in the DRC, which is a country in Africa. It has also moved to Uganda, a nearby country.

The CDC is a US government group. It helps keep people safe from disease. The CDC has new rules for travelers coming from DRC or Uganda.

These travelers must fly into one of three airports: Atlanta, New York JFK, or Los Angeles. At these airports, health workers will check if the travelers are sick. Doctors also have a new medicine to help sick people.

Ebola

a very serious and often deadly disease caused by the Ebola virus

outbreak

a sudden increase in the number of people getting a disease in the same area

CDC

the US Centers for Disease Control and Prevention, a government health agency

traveler

a person who goes from one place to another, often by plane

airport

a place where planes take off and land

disease

an illness that makes people sick

medicine

a drug or treatment used to help sick people get better

health worker

a person whose job is to take care of sick people or prevent disease

Elementary

A serious Ebola outbreak in central Africa has prompted the United States to tighten its border health rules. The outbreak began in the Democratic Republic of Congo and has spread to Uganda, a neighboring country.

More than 136 people have died so far. The Ebola strain involved is called the Bundibugyo strain, which was first identified in 2007. It is less deadly than the better-known Zaire strain but still kills roughly 25 to 35 percent of those infected.

The World Health Organization declared a Public Health Emergency of International Concern on May 17, 2026. This is the highest global health alert. It signals that the outbreak could affect countries beyond Africa.

The US CDC responded by opening a Level 2 Emergency Operations Center. It also issued an order telling airlines that all passengers traveling from DRC or Uganda must land at one of three US airports: Atlanta, New York JFK, or Los Angeles. Health officials will screen travelers at these hubs.

A new antibody treatment called MBP134 has been sent to field hospitals near the outbreak. Scientists at the Sabin Vaccine Institute have also restarted a vaccine trial that was paused in 2023. Doctors hope this ring vaccination program, which vaccinates people who had contact with a sick person, can help stop the spread.

Bundibugyo strain

a type of Ebola virus first found in Uganda in 2007, less deadly than the Zaire strain

Public Health Emergency of International Concern

the highest alert level declared by the World Health Organization for a global disease threat

Emergency Operations Center

a control room that coordinates a health agency's response to a major crisis

channelling order

a US government rule that directs all travelers from a specific region to land at a limited set of airports for health screening

antibody treatment

a medicine made from proteins that can recognize and attack a specific virus

ring vaccination

a strategy of vaccinating everyone who had contact with a sick person to create a protective ring around an outbreak

screening

checking people for signs of illness, often at borders or transportation hubs

hub

a central airport or city through which many travelers pass

Intermediate

A Bundibugyo Ebola virus disease outbreak centered in North Kivu province of the Democratic Republic of Congo has crossed into Uganda's Kisoro district, raising the total confirmed and probable death toll to at least 136 as of May 23, 2026. The Bundibugyo strain carries a case fatality rate of roughly 25 to 34 percent in field settings, significantly lower than the Zaire strain's historical average above 60 percent, but sufficient to overwhelm regional health systems that were already strained by concurrent cholera and mpox transmission chains.

The World Health Organization convened an emergency committee under International Health Regulations Article 12 and declared a Public Health Emergency of International Concern on May 17, triggering coordinated international assistance, COVAX stockpile releases, and bilateral laboratory surge support from the UK's UKHSA and Germany's RKI.

The US CDC escalated its Emergency Operations Center to Level 2 on the same day and, acting under authority granted by 42 CFR Part 71, issued a federal quarantine-station channelling order. The order requires all commercial carriers to route passengers with recent presence in DRC or Uganda through Hartsfield-Jackson Atlanta, John F. Kennedy International, or Los Angeles International, where CBP-coordinated medical officers can conduct structured symptom and exposure interviews and issue monitoring agreements to travelers without signs of illness.

On the therapeutic side, the US Department of Defense Strategic National Stockpile has deployed MBP134, a bispecific monoclonal antibody cocktail developed by the US Army Medical Research Institute of Infectious Diseases that showed 100 percent survival in nonhuman primate studies against Bundibugyo virus. Compassionate use protocols are active at three treatment units in Goma, Rutshuru, and Kisoro.

The Sabin Vaccine Institute reactivated its Phase II ring-vaccination trial of rVSV-BDBV, a recombinant vesicular stomatitis virus vectored vaccine targeting Bundibugyo antigen. The trial was suspended in late 2023 when the outbreak at that time was controlled. Regulators have granted an emergency Investigational New Drug extension, and the first cohort of healthcare contacts was enrolled in Kisoro on May 21.

case fatality rate

the percentage of people diagnosed with a disease who die from it during an outbreak

International Health Regulations

a legally binding WHO framework requiring member states to report and respond to events that may constitute international public health emergencies

channelling order

a US federal directive routing travelers from a specified region to designated airports equipped with CDC quarantine stations

Strategic National Stockpile

the US government's emergency reserve of medicines, vaccines, and medical supplies for large-scale health crises

monoclonal antibody cocktail

Advanced

The Bundibugyo ebolavirus (BDBV) outbreak now centred on North Kivu province and Kisoro district represents the third confirmed inter-country spill of BDBV since the species' index event in 2007 and the first to generate a PHEIC under the revised International Health Regulations (2005) Annex 2 decision instrument. The R-effective estimated from the first four weeks of transmission chains stands at approximately 1.4 for community cases and 0.7 for healthcare-facility-associated cases following the enforcement of enhanced PPE protocols at treatment units, consistent with BDBV's comparatively lower secondary attack rate relative to EBOV.

The federal quarantine-station channelling architecture operationalized under 42 CFR Part 71.40 builds on the infrastructure established during the 2014 to 2016 West Africa EBOV response. Unlike the 2014 mechanism, the current order incorporates an electronic Traveler Health Declaration integrated with CBP's Advance Passenger Information System, enabling pre-clearance risk stratification before aircraft landing and allowing officers to prioritize high-risk contacts for point-of-care BDBV RT-PCR testing from a nasopharyngeal swab with a 40-minute turnaround time.

MBP134, developed under BARDA contract HHSO100201700020C, is a bispecific antibody binding simultaneously to the Ebola glycoprotein receptor-binding domain and to a second conserved epitope on GP2, producing synergistic viral neutralization with an IC50 of 0.02 nanomolars in pseudovirus assays for BDBV. The compound's 100 percent survival efficacy in rhesus macaque challenge studies at a single 50 mg/kg IV dose provides the regulatory basis for its Emergency Use Authorization pending rapid Phase I safety data from the current compassionate-use cohort.

The rVSV-BDBV candidate being evaluated under the reactivated Sabin Phase II protocol employs the same VSV-based backbone as the licensed EBOV vaccine rVSV-ZEBOV (Ervebo), substituting the Zaire glycoprotein open reading frame with BDBV GP. Interim immunogenicity data from the 2022 to 2023 Phase II cohort showed seroconversion rates of 94 percent at Day 28 post-vaccination and sustained neutralizing antibody titres above a correlate-of-protection threshold of 1:400 at six months, providing the scientific rationale for the emergency IND extension granted by FDA under 21 CFR 312.310.

Epidemiological modeling from the London School of Hygiene and Tropical Medicine projects that combining MBP134 case management with 70 percent coverage ring vaccination could reduce the expected final size of the outbreak by 67 percent compared with standard supportive care alone, contingent on response capacity at Kisoro not being saturated by concurrent caseload from the North Kivu transmission cluster. WHO GOARN has pre-positioned a second epidemiological surge team in Kigali, Rwanda, as a forward hub to enable 48-hour deployment to either the DRC or Ugandan affected zones.

secondary attack rate

the probability that infection occurs among susceptible people within a defined group after one primary case has been identified, used to measure how easily a pathogen spreads