WHO Declares Ebola Outbreak in DRC and Uganda Public Health Emergency

Over the weekend, the World Health Organization (WHO) declared the Ebola epidemic in the Democratic Republic of the Congo (DRC) and Uganda a public health emergency of international concern. The WHO stated that while there is currently no risk of a pandemic, the situation necessitates urgent international coordination to mitigate the risks of the disease spreading to other countries in Africa and beyond. Reports from Ituri province indicate at least 80 suspected deaths, with a total of 246 suspected cases spread across three health zones. Currently, there are eight confirmed laboratory cases, though challenges in collecting samples and conducting tests in remote areas have hampered accurate assessment. In Uganda, two confirmed cases have emerged, both involving individuals who came from the DRC; one of these individuals has died, and importantly, the two cases do not appear related to one another. The WHO has expressed concerns that the Ebola outbreak could be more extensive than initially thought, primarily due to the lack of adequate contact tracing efforts. The potential number of infections may be higher, particularly given a recent uptick in reports of suspected deaths in urban regions. The contagion has already breached the borders of the DRC, underscoring the importance of strengthening diagnostic testing, isolating those suspected of infection, and enhancing public communication to raise awareness about the disease's risks. Ebola, which is highly contagious and carries a significant mortality rate among those infected, is caused by a group of viruses first identified in the late 1970s in the DRC (then Zaire) and South Sudan. The current epidemic is caused by the Bundibugyo ebolavirus, a species recognized approximately two decades ago in Uganda. This particular strain is historically less prevalent, leading to less extensive research and consequently fewer tools available to combat its spread. Vaccines developed for the Zaire ebolavirus may not be effective against the Bundibugyo strain, complicating diagnostic testing and treatment efforts. Clinically, both the Zaire and Bundibugyo ebolaviruses produce similar symptoms. Initial symptoms like fatigue, headaches, and fever typically emerge within a few days after an incubation period that can last from a couple of days up to three weeks. However, in the second phase of the illness, symptoms deteriorate, leading to hemorrhagic fevers that frequently result in fatal outcomes. Historically, the mortality rate for the Bundibugyo ebolavirus is around 35%, indicating that one in three individuals who contract the virus may succumb to it. While this is lower than the mortality associated with Zaire ebolavirus, estimating the exact mortality rate is challenging due to the numerous variables influencing each outbreak. Transmission occurs through direct contact with the bodily fluids of an infected individual, including blood, saliva, and sweat. As the disease progresses, it can instigate symptoms such as vomiting and diarrhea, increasing the risk of transmission among caregivers. Additionally, inadequate burial practices common in poorer, more isolated areas contribute to the risk of contagion, as the virus remains infectious for an extended period even after death. In 2022, the DRC experienced its sixteenth registered Ebola outbreak since the virus was first recognized, which included over 50 confirmed cases and at least 45 deaths. Uganda also reported 12 confirmed cases and four deaths last year. The 2019 outbreak in the DRC was notably severe, with over 3,500 cases and approximately 2,300 deaths, while the largest outbreak occurred in West Africa from 2014 to 2016, which saw nearly 30,000 cases and over 11,000 deaths. In response to the present outbreak, the WHO advises postponing large public events in both DRC and Uganda and enhancing control measures to prevent further spread. Experts have suggested, however, that closing borders is unnecessary, as widespread travel and cargo restrictions may prompt informal and uncontrolled crossings, hindering health institutions' abilities to conduct effective contact tracing. Related Sources: • Source 1 • Source 2