CDC Warns Ebola Outbreak in Central Africa Could Rival 2014 Epidemic

A new analysis from U.S. health officials suggests the Ebola outbreak in Central Africa could spread to a magnitude similar to the deadliest outbreak in history, which struck West Africa from 2014 to 2016 and killed more than 11,000 people. The report, released Friday by the U.S. Centers for Disease Control and Prevention (CDC), presents multiple scenarios based on computer modeling, ranging from 10,000 cases to over 20,000. During the West Africa outbreak, more than 28,000 infections were recorded.

The CDC said cases could climb to 20,000 or more, depending on how quickly infected individuals are isolated to slow transmission. Satish Pillai, the CDC's Ebola response lead, said that without robust public health interventions, “the modeling work suggests such a large-scale outbreak is entirely possible.”

Jennifer Nuzzo, director of the Pandemic Center at Brown University, said the model “confirms what we feared from the start: the outbreak is on a dangerous trajectory” without greater efforts to curb spread. However, she also cautioned that precise predictions are difficult. “I wouldn't read too much into the specific numbers. It's really hard to make accurate forecasts with limited data,” she said.

According to the Africa Centers for Disease Control and Prevention, as of Friday, around 400 confirmed Ebola cases had been reported, including 63 deaths. Experts believe other cases may remain undiagnosed or unreported.

The Ebola virus spreads through contact with bodily fluids such as vomit, blood, and semen. There is currently no specific treatment or vaccine for the Bundibugyo strain responsible for the current outbreak. The disease is often fatal.

The World Health Organization (WHO) declared the outbreak a global health emergency in May. Some experts believe cases may have emerged as early as February, but health officials initially tested for a different Ebola virus.

Response efforts have been complicated by armed conflict between the Congolese government and the Rwanda-backed M23 rebel group, as well as attacks by the Allied Democratic Forces (ADF), linked to the Islamic State (IS). Violence has triggered mass displacement in conflict zones, according to officials.

The CDC modeling report attempts to forecast scenarios based on various factors, including the number of infections and deaths already recorded, and the speed at which response teams can identify and isolate infected individuals before they transmit the virus. Pillai said the actual isolation rate remains unclear but is considered “low within the scenarios” modeled by the CDC. With higher isolation rates—50% or 70%—cases could be limited to around 10,000, according to CDC officials. However, if the actual death toll by the end of May is higher than currently estimated, the outcome could be worse.

Some CDC models during the large West Africa Ebola outbreak showed significant discrepancies. In 2014, as the disease spiraled out of control and international health officials scrambled to mount a response, the CDC estimated that in the worst-case scenario (without any measures), up to 1.4 million people could be infected—more than 50 times the actual figure.