The US Centers for Disease Control and Prevention has sounded the alarm over a fresh outbreak of Ebola virus disease in the Democratic Republic of Congo, where 37 confirmed cases and 19 deaths have been recorded as of September 18.
The agency, in addition to its September 8 travel notice, is urging travelers to Congo to avoid contact with sick individuals and to monitor themselves for symptoms of Ebola while in the outbreak zones and for 21 days after leaving.
CNN wellness expert, Dr. Leana Wen, emergency physician and clinical associate professor at George Washington University, explained the seriousness of the situation. “Ebola is a serious illness with a high fatality rate in humans. On average, one in two infected people will die,” she said, citing World Health Organization (WHO) figures that put the case fatality rate at around 50%.
What causes Ebola?
Ebola belongs to a group of viruses within the Orthoebolavirus family, first identified in 1976 in what is now the DRC. Variants include the Ebola virus itself, Sudan virus, Bundibugyo virus, and Taï Forest virus, all of which can cause severe illness in humans.
The latest outbreak in Congo is attributed to the Ebola virus, marking the country’s 16th reported outbreak since 1976.
Symptoms and progression
The disease has an incubation period ranging from two to 21 days, with most patients showing signs within eight to 10 days after exposure.
“Patients often begin with what we call ‘dry’ symptoms, fever, joint and muscle aches, severe headaches, and fatigue,” Wen explained. These nonspecific symptoms are easily mistaken for other tropical illnesses such as malaria, influenza, or typhoid fever.
Within days, many progress to the more dangerous “wet” phase of the illness. This includes abdominal pain, vomiting, diarrhea, rash, chest pain, and sometimes bleeding from the eyes, nose, mouth, or rectum. In severe cases, the infection can escalate to organ failure, seizures, brain inflammation, and death.
How the virus spreads
Ebola is primarily spread from person to person through direct contact with the blood or body fluids of an infected individual, whether alive or deceased. Contaminated objects like bedding, clothes, and medical equipment also pose risks. Transmission has been documented through semen from infected men, even after recovery.
Animal-to-human transmission is another route, typically from handling or consuming infected wildlife, such as bats, monkeys, and antelope. “Activities like hunting or even entering caves where bats live can put people at risk,” Wen warned.
Treatment options
There is no universal cure for Ebola, but supportive care significantly improves survival. Patients are immediately isolated, and treatment focuses on replacing fluids and electrolytes, stabilizing blood pressure and oxygen levels, and addressing secondary infections.
Two FDA-approved treatments exist: a monoclonal antibody cocktail and a single monoclonal antibody therapy. Wen noted that “while these medicines reduce mortality, the death rate remains high even with treatment. Access is also limited in sub-Saharan Africa, where most outbreaks occur, due to cost and logistical challenges.”
Vaccines and prevention
A major breakthrough came in 2019 when the FDA approved Ervebo, the first vaccine against Ebola virus disease. A second vaccine exists in Europe but is not available in the US.
Ervebo is deployed using a “ring vaccination” strategy, vaccinating contacts of confirmed patients, their close contacts, and frontline health workers. WHO has already deployed 400 doses to outbreak hotspots in Congo, with more on the way.
Why the CDC issued alerts
While the current outbreak is confined to Congo, US health authorities want to ensure vigilance. “Issuing a health advisory alerts clinicians to consider Ebola in patients with concerning symptoms who have recently traveled to outbreak areas,” Wen said. The notice also equips hospitals, labs, and public health departments with resources on handling potential cases.
She stressed that the risk to the United States remains low, with no suspected or confirmed cases linked to this outbreak outside Congo. However, CDC guidance for travelers is clear: avoid contact with sick individuals, monitor symptoms for 21 days after departure, and seek immediate medical attention if illness develops.
Safety advice for the public
For those in affected areas, precautions are vital. This includes avoiding contact not only with sick people but also with contaminated surfaces and medical equipment. Traditional burial practices involving touching the body of the deceased should be avoided. Contact with wild animals—especially bats, monkeys, and antelope—also poses significant danger.
“There are no special recommendations for the public outside outbreak zones,” Wen emphasized. “But for people in affected areas, strict adherence to precautions can mean the difference between safety and exposure.”
