Emerging Infection of Sudan Ebola Virus: Implications and India’s Role

Dear Sir, The recent declaration of a Sudan virus disease (SVD) epidemic in Uganda by the Ministry of Health on 30 January 2025 underscores the persistent threat posed by filoviruses in endemic areas. The SVD is caused by Sudan Ebola virus (SUDV) that is genetically distinct from other Ebola viruses despite the symptoms and transmission being almost the same. Despite Uganda’s effective management of previous outbreaks, growing evidence indicates the potential for cryptic transmission, necessitating a modification in surveillance and response techniques.[1] Bosa et al.[2] proposed that the recurrence of Sudan virus epidemics may not be only ascribed to fresh zoonotic spillover events, but also to ongoing circulation within the population or environment. The genomic sequencing of the present epidemic strain reveals its close affinity to the 2012 SVD strain, implying possible intermediate hosts or extended asymptomatic transmission. This challenges the traditional perspective that filovirus outbreaks arise solely from discrete spillover episodes and necessitates a more comprehensive ecological and epidemiological inquiry.[3] A primary issue in tackling cryptic transmission is the extended viral persistence in convalescent patients. Research from the 2022–2023 outbreak indicates that virus RNA can be identified in semen and breast milk for more than 145 days following infection, with certain instances lasting up to 2 years. Considering the persistence of the virus in the body, the possibility of asymptomatic transmission must not be overlooked. This underscores the necessity for ongoing clinical monitoring and focused immunology research to identify those at risk.[4] These steps will decrease the possibility of outbreaks and further epidemics in the concerned population. The epidemic response must integrate improved diagnostic methods, particularly multiplex fast diagnostic tests that distinguish SVD from other endemic febrile diseases such as malaria and typhoid. In areas with frequent outbreaks, point-of-care diagnostics combined with community-based surveillance can address knowledge deficiencies and enhance early case identification.[5] Moreover, proactive investigation into the natural reservoirs of SVD, encompassing anthropological and ecological studies, is essential to prevent future outbreaks. India, leveraging its proficiency in infectious disease surveillance (National Centre for Disease Control, New Delhi) and laboratory capabilities (Indian Council of Medical Research institutes such as National Institute of Virology Pune, National Institute for Research in Bacterial Infections NIRBI, Kolkata), can enhance these initiatives via joint research, data-sharing platforms, and technical support. Investing in epidemiological modelling, immunological profiling, and quick diagnostics can facilitate worldwide initiatives to proactively manage filovirus epidemics before they develop into public health crises. The ongoing SVD outbreak in Uganda highlights the dynamic characteristics of viral hemorrhagic fevers. An extensive response—incorporating cryptic transmission research, long-term survivor surveillance, and novel diagnostic methodologies—is crucial for the effective management and prevention of future epidemics. The Indian scientific and public health sectors must participate in international collaborations to tackle this developing challenge. Rishabh Kumar Rana Dewesh Kumar Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.