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Effect of Community-Based Lassa Fever Surveillance on Lassa Fever Case Detection in Nigeria

Abstract

Lassa fever remains an important public health concern in Nigeria and is endemic in several parts of the country, with periodic outbreaks associated with substantial morbidity and mortality. Early detection of suspected cases is essential for prompt isolation, laboratory confirmation, treatment, contact tracing, infection prevention and control, and outbreak response. However, delays in recognizing symptoms, limited access to healthcare facilities, inadequate surveillance coverage, weak community reporting mechanisms, and insufficient awareness may contribute to delayed detection of Lassa fever cases. Community-based surveillance provides an opportunity to strengthen disease detection by involving community health workers, volunteers, traditional leaders, and other community stakeholders in identifying suspected cases and promptly reporting unusual illnesses to the appropriate health authorities. Against this background, this study investigates the effect of community-based Lassa fever surveillance on Lassa fever case detection in Nigeria. The study will be anchored on the Social Ecological Model, Health Belief Model, and Health Systems Framework. The Social Ecological Model emphasizes the interaction between individuals, households, communities, healthcare facilities, and broader health systems in influencing disease surveillance and reporting. The Health Belief Model explains how community members' perceptions of Lassa fever susceptibility and severity, perceived benefits of early reporting, perceived barriers, and cues to action may influence their willingness to report suspected cases. The Health Systems Framework emphasizes surveillance, service delivery, health workforce, health information systems, financing, governance, and access to appropriate healthcare services as essential components of effective disease detection and outbreak response. Collectively, these theoretical perspectives provide a suitable framework for explaining how community-based surveillance may influence Lassa fever case detection in Nigeria. The study will adopt a quantitative quasi-experimental or community-based comparative research design. The study population will comprise residents of selected communities in Lassa fever-prone areas of Nigeria, community health workers, community-based surveillance volunteers, and relevant healthcare personnel involved in disease surveillance. A multistage sampling technique will be used to select states, local government areas, communities, households, surveillance units, and healthcare facilities. Community-based Lassa fever surveillance will be assessed using indicators such as availability of community surveillance activities, number and coverage of trained community surveillance personnel, frequency of household visits, community sensitization activities, availability of case definitions and reporting tools, identification of suspected cases, timeliness of notification, communication between communities and health facilities, referral arrangements, feedback mechanisms, and surveillance supervision. Lassa fever case detection will be assessed using indicators such as number of suspected cases identified, suspected cases reported through community surveillance, time from symptom onset to notification, time from notification to healthcare assessment, number of cases tested, laboratory-confirmed cases, proportion of suspected cases appropriately referred, and completeness and timeliness of surveillance reports. Data will be collected using structured questionnaires, community surveillance registers, healthcare facility records, disease notification forms, laboratory records, referral records, surveillance reports, and programme monitoring documents. Descriptive statistics will be used to summarize participants' characteristics, surveillance coverage, reporting patterns, and case-detection outcomes. Inferential statistical techniques, including chi-square tests, t-tests, correlation analysis, and logistic or multiple regression analysis where appropriate, will be used to determine the effect of community-based Lassa fever surveillance on case detection. Where a quasi-experimental design is adopted, case-detection indicators before and after implementation or strengthening of community surveillance activities may be compared, or communities with enhanced surveillance may be compared with similar communities receiving routine surveillance. Diagnostic tests will also be conducted to assess the reliability, validity, and robustness of the findings. The study is expected to find that community-based Lassa fever surveillance has a significant positive effect on Lassa fever case detection in Nigeria. Communities with functional surveillance systems, trained community health workers, regular sensitization, and effective communication with healthcare facilities are expected to identify and report suspected Lassa fever cases earlier than communities with limited surveillance activities. Early community-level identification may facilitate timely referral, laboratory testing, isolation where indicated, initiation of appropriate treatment, contact tracing, and implementation of infection prevention and control measures. However, limited surveillance resources, inadequate training, poor communication networks, fear and stigma associated with Lassa fever, delays in laboratory testing, insufficient healthcare access, and weak referral and feedback mechanisms may reduce the effectiveness of community-based surveillance. The study therefore expects well-coordinated, adequately resourced, community-responsive, and regularly supervised surveillance systems to contribute significantly to improved Lassa fever case detection in Nigeria. The study is expected to contribute to the literature on community-based disease surveillance, Lassa fever case detection, infectious disease surveillance, outbreak preparedness, community health, viral haemorrhagic fever surveillance, and public health in Nigeria. The findings will provide useful information to the Nigeria Centre for Disease Control and Prevention, Federal Ministry of Health and Social Welfare, National Primary Health Care Development Agency, state ministries of health, local government health authorities, healthcare facilities, community health workers, traditional and community leaders, development partners, and policymakers regarding strategies for strengthening Lassa fever surveillance. The study will also provide evidence-based recommendations for expanding community-based surveillance coverage, strengthening training and supervision of community surveillance personnel, improving community awareness and early reporting, strengthening communication between communities and health facilities, improving access to laboratory testing and referral services, enhancing surveillance data management, and integrating community-based surveillance into broader infectious disease preparedness and outbreak response systems across Nigeria.

Keywords: Community-based surveillance, Lassa fever, case detection, disease surveillance, outbreak preparedness, infectious disease surveillance, community health workers, viral haemorrhagic fever, Nigeria, public health.