Outbreaks of disease in settings affected by crises grow rapidly due to late detection and weakened public health systems. Where surveillance is underfunctioning, community-based surveillance can contribute to rapid outbreak detection and response, a core capacity of the International Health Regulations. We reviewed articles describing the potential for community-based surveillance to detect diseases of epidemic potential, outbreaks, and mortality among populations affected by crises. Surveillance objectives have included the early warning of outbreaks, active case finding during outbreaks, case finding for eradication programmes, and mortality surveillance. Community-based surveillance can provide sensitive and timely detection, identify valid signals for diseases with salient symptoms, and provide continuity in remote areas during cycles of insecurity. Effectiveness appears to be mediated by operational requirements for continuous supervision of large community networks, verification of a large number of signals, and integration of community-based surveillance within the routine investigation and response infrastructure. Similar to all community health systems, community-based surveillance requires simple design, reliable supervision, and early and routine monitoring and evaluation to ensure data validity. Research priorities include the evaluation of syndromic case definitions, electronic data collection for community members, sentinel site designs, and statistical techniques to counterbalance false positive signals.

BackgroundIn the last decade, community mobilisation (CM) interventions targeting female sex workers (FSWs) have been scaled-up in India’s national response to the HIV epidemic. This included the Bill and Melinda Gates Foundation’s Avahan programme which adopted a business approach to plan and manage implementation at scale. With the focus of evaluation efforts on measuring effectiveness and health impacts there has been little analysis thus far of the interaction of the CM interventions with the sex work industry in complex urban environments.Methods and FindingsBetween March and July 2012 semi-structured, in-depth interviews and focus group discussions were conducted with 63 HIV intervention implementers, to explore challenges of HIV prevention among FSWs in Mumbai. A thematic analysis identified contextual factors that impact CM implementation. Large-scale interventions are not only impacted by, but were shown to shape the dynamic social context. Registration practices and programme monitoring were experienced as stigmatising, reflected in shifting client preferences towards women not disclosing as ‘sex workers’. This combined with urban redevelopment and gentrification of traditional red light areas, forcing dispersal and more ‘hidden’ ways of solicitation, further challenging outreach and collectivisation. Participants reported that brothel owners and ‘pimps’ continued to restrict access to sex workers and the heterogeneous ‘community’ of FSWs remains fragmented with high levels of mobility. Stakeholder engagement was poor and mobilising around HIV prevention not compelling. Interventions largely failed to respond to community needs as strong target-orientation skewed activities towards those most easily measured and reported.ConclusionLarge-scale interventions have been impacted by and contributed to an increasingly complex sex work environment in Mumbai, challenging outreach and mobilisation efforts. Sex workers remain a vulnerable and disempowered group needing continued support and more comprehensive services.

BackgroundThe period 2006–2009 saw intensive scale-up of HIV prevention efforts and an increase in reported safer sex among brothel and street-based sex workers in Mumbai and Thane (Maharashtra, India). Yet during the same period, the prevalence of HIV increased in these groups. A better understanding of sex workers’ risk environment is needed to explain this paradox.MethodsIn this qualitative study we conducted 36 individual interviews, 9 joint interviews, and 10 focus group discussions with people associated with HIV interventions between March and May 2012.ResultsDramatic changes in Mumbai’s urban landscape dominated participants’ accounts, with dwindling sex worker numbers in traditional brothel areas attributed to urban restructuring. Gentrification and anti-trafficking efforts explained an escalation in police raids. This contributed to dispersal of sex work with the sex-trade management adapting by becoming more hidden and mobile, leading to increased vulnerability. Affordable mobile phone technology enabled independent sex workers to trade in more hidden ways and there was an increased dependence on lovers for support. The risk context has become ever more challenging, with animosity against sex work amplified since the scale up of targeted interventions. Focus on condom use with sex workers inadvertently contributed to the diversification of the sex trade as clients seek out women who are less visible. Sex workers and other marginalised women who sell sex all strictly prioritise anonymity. Power structures in the sex trade continue to pose insurmountable barriers to reaching young and new sex workers. Economic vulnerability shaped women’s decisions to compromise on condom use. Surveys monitoring HIV prevalence among ‘visible’ street and brothel-bases sex workers are increasingly un-representative of all women selling sex and self-reported condom use is no longer a valid measure of risk reduction.ConclusionsTargeted harm reduction programmes with sex workers fail when implemented in complex urban environments that favour abolition. Increased stigmatisation and dispersal of risk can no longer be considered as unexpected. Reaching the increasing proportion of sex workers who intentionally avoid HIV prevention programmes has become the main challenge. Future evaluations need to incorporate building ‘dark logic’ models to predict potential harms.

enabled Red Cross staff and partners to decide whether follow up, investigation or response was required for alerts. Scripts in Rstudio were furthermore used to generate automatic epidemiological reports based on SMS database and case investigation data, and shared with stakeholders to monitor trends over time.Results: The CBS system had the sensitivity and specificity required to detect cholera outbreaks, as evidenced by comparing temporal variation in the rate of occurrence of cases in the CBS data with available line-list data from cholera treatment facilities. However, the data from the CBS system is noisy. Our results show positive proof of concept for disease surveillance by volunteers with mobile phones, and the ability, for the first time, to detect cholera in rural areas that are often missed in formal surveillance. Furthermore, our results illustrate that community-based surveillance works best when integrated with the formal healthcare system-coupling the high sensitivity and low specificity of community surveillance with the high specificity and low sensitivity of formal surveillance, which cannot always penetrate rural areas, or areas recently affected by environmental or humanitarian emergencies.Conclusion: Community-based surveillance is an important strategy to broaden the reach of public health surveillance to rural communities in resource poor settings, especially during outbreaks. The project demonstrates the potential for scale and sustainability by utilising existing volunteer networks in response to disease outbreaks.http://dx.

Purpose: The objective of this study was to explore the volunteers' experiences with and perspectives on the community event-based surveillance system in Sierra Leone.Methods and materials: 62 volunteers from 14 different chiefdoms participated in in-depth interviews and focus group discussions, which were audio recorded and transcribed. A comprehensive and systematic thematic analysis was conducted, which identified key benefits and challenges. Results:The volunteers believe CEBS positively impacts their communities. CEBS increases knowledge and behavior change, contributing to the prevention of Ebola and other diseases and decreasing overall mortality. Volunteers are motivated to participate by an aspiration of helping their community, although many volunteers also participated in the hope of receiving monetary incentives. Communities were initially reluctant to participate in surveillance due to fear of Ebola, but acceptance increased with improved community engagement. Reporting by phone call and SMS was perceived as a quick and simple way of reporting, although challenges with access to mobile network, sim registration and cost for charging were identified. Many of the volunteers could not repeat or explain the different case definitions and explained reporting on symptoms solely or other health events, suggesting that the volunteers did not have a clear understanding of case definitions or purpose of CEBS.Conclusion: SMS reporting directly from the community is perceived as a timely, easy and reliable way of sharing important information, but the usefulness of the system relies not only on the structure of the system itself, but also on external factors, such as the relationship between the community members and the volunteers, and the logistical structure.