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Tanzania declared a Marburg Virus Disease (MVD) outbreak on March 21, 2023, reporting nine cases and six deaths (case fatality rate (CFR) 66.7%). Detection began when a Community Health Worker (CHW) reported unexplained illness via the electronic EBS (e-EBS) system, triggering a national outbreak response. This study documents the Early Warning, Alert and Response (EWAR) interventions carried out during the MVD outbreak response in the Kagera region to identify strengths and bottlenecks for strengthening future outbreak preparedness and response efforts. We documented EWAR interventions using retrospective surveillance document review. MVD outbreak detection and reporting timeliness were compared with Tanzania's EBS indicators and the 7-1-7 target. Surveillance interventions included additional staff deployment, equipment addition, and tool adoption. Community sensitization efforts utilized Swahili-translated informational cards to facilitate early detection and reporting of signals through multiple channels, including the 199-hotline number, EBS desk numbers and via e-EBS and verified using the standard case definition (SCD). Signals were compiled in Microsoft Excel, where descriptive analysis using frequencies to show trends was conducted. Suspected MVD cases were sent for laboratory confirmation. On March 15, 2023, a CHW reported a signal in the e-EBS system within 24 hours. However, a community member and HCWs missed unusual signs of the MVD index case. Five additional members were deployed to support data management using the equipment provided, including three laptops, ten smartphones, and adapted tools. A total of 6,260 informational cards were distributed during community sensitization; 176 MVD signals were reported, where 48 (27.3%) met the SCD, and 37 were sent for laboratory confirmation, of which 2.7% tested positive for the virus. Most signals, 107 (60.8%), were reported in April. The government should adopt the 7-1-7 target and strengthen community and health facility EBS through ongoing mentorship for EWAR.

Marburg viral disease (MVD) is a highly infectious disease with a case fatality rate of up to 90%, particularly impacting resource-limited countries where implementing Infection Prevention and Control (IPC) measures is challenging. This paper shares the experience of how Tanzania has improved its capacity to prevent and control highly infectious diseases, and how this capacity was utilized during the outbreak of the MVD disease that occurred for the first time in the country in 2023. In 2016 and the subsequent years, Tanzania conducted self and external assessments that revealed limited IPC capacity in responding to highly infectious diseases. To address these gaps, initiatives were undertaken, including the enhancement of IPC readiness through the development and dissemination of guidelines, assessments of healthcare facilities, supportive supervision and mentorship, procurement of supplies, and the renovation or construction of environments to bolster IPC implementation. The official confirmation and declaration of MVD on March 21, 2023, came after five patients had already died of the disease. MVD primarily spreads through contact and presents with severe symptoms, which make patient care and prevention challenging, especially in resource-limited settings. However, with the use of a trained workforce; IPC rapid needs assessment was conducted, identifying specific gaps. Based on the results; mentorship programs were carried out, specific policies and guidelines were developed, security measures were enhanced, all burial activities in the area were supervised, and both patients and staff were monitored across all facilities. By the end of the outbreak response on June 1, 2023, a total of 212 contacts had been identified, with the addition of only three deaths. Invasive procedures like dialysis and Manual Vacuum Aspiration prevented some deaths in infected patients, procedures previously discouraged. In summary, this experience underscores the critical importance of strict adherence to IPC practices in controlling highly infectious diseases. Recommendations for low-income countries include motivating healthcare providers and improving working conditions to enhance commitment in challenging environments. This report offers valuable insights and practical interventions for preparing for and addressing highly infectious disease outbreaks through implementation of IPC measures.