Ebola Outbreak in the Democratic Republic of the Congo
Researchers in infectious diseases suggest that an Ebola outbreak in the Democratic Republic of the Congo (DRC) might have been spreading unnoticed for several weeks or even months. The World Health Organization (WHO) designated this situation as a public health emergency of international concern on May 17. Currently, at least 10 confirmed cases of the Ebola virus have been identified, while over 330 individuals are suspected of infection, as per the US Centers for Disease Control and Prevention. Tragically, more than 80 deaths are believed to be linked to the outbreak.
Additionally, Uganda has reported cases of the virus after two individuals, who were confirmed to be infected, crossed over from the DRC. Both countries announced their outbreaks last week, according to a statement from the Africa Centres for Disease Control and Prevention.
Tedros Adhanom Ghebreyesus, the director-general of WHO, noted that infections have arisen among people with no apparent connection. Disturbingly, at least four healthcare workers from the same hospital have died, raising concerns about possible transmission within healthcare settings. The actual number of cases might be significantly higher than what is currently reported, and how those confirmed or suspected cases contracted the virus remains unclear, according to Tedros.
Vinod Balasubramaniam, a molecular virologist from Monash University, pointed out that issues arise when healthcare workers are affected, as it undermines the health system and can hasten the spread of the outbreak.
The outbreak, confirmed on May 15 by a national laboratory, is caused by the Bundibugyo species of the Ebola virus, which has a fatality rate reported between 25% and 50%. Like other Ebola strains, this type spreads through contact with the bodily fluids of an infected person.
Siouxsie Wiles, a microbiologist from the University of Auckland, highlighted that there have only been two previous documented outbreaks of the Bundibugyo species—one in Uganda in 2007 and another in the DRC in 2012. There are currently no approved vaccines or treatments for this particular species, and many rapid diagnostic tests in use are designed for the more prevalent Ebola Zaire.
Kirsten Spann, a virologist at Queensland University of Technology, emphasized the urgency of increasing diagnostic testing capabilities in the DRC, Uganda, and surrounding regions. This would allow for the identification of infections in those displaying mild symptoms, which could help control the spread of the virus.
Origin of the Outbreak
The outbreak was initially reported in Ituri province in eastern DRC, where a healthcare worker who exhibited fever, vomiting, and bleeding on April 24 is believed to be the first case; they died shortly thereafter.
The virus has a lengthy incubation period, ranging from 2 to 21 days. Given the number of reported cases so far, it’s plausible that the virus has been spreading for several months, noted Raina MacIntyre, an epidemiologist at the University of New South Wales. The delay in recognizing the outbreak could also be due to the simultaneous presence of other diseases, such as measles, mpox, and malaria, that healthcare workers are currently addressing.
It’s also worth considering that the ongoing conflict in the DRC, with armed groups still conducting attacks in Ituri province, likely has allowed the spread of this strain of Ebola to go undetected for an extended period. Wiles pointed out that the region has a highly mobile population trying to evade conflict. Continuous migration, paired with limited access to healthcare, could facilitate unnoticed viral transmission.
A significant concern for public health officials is the potential for the virus to spread to additional countries. The WHO has identified bordering countries as high-risk areas for further contagion and has urged them to initiate active surveillance efforts.
