The observed homicide variability between Latin American countries can be explained largely by differences in the countries' social contexts and political models. In those countries where homicide rates are extremely high, governments should review their current policies and take preventive actions. Fortunately increasingly nowadays there are promising advancements in that direction.

Objetivos. Mostrar la utilidad de un modelo eficaz y oportuno de información y llamar la atención acerca de la gravedad del problema de los homicidios, así como demostrar la necesidad de mantener este tipo de modelo y de sostener proyectos preventivos integrales, como el Programa Desarrollo, Seguridad y Paz (DESEPAZ (OR: 3,1; IC95%: 2,6 a 3,6). En los casos que ocurrieron durante una riña personal o de grupo se observó su asociación con el uso de un arma cortopunzante y con el consumo de bebidas alcohólicas por parte de la víctima (OR: 1,9; IC95%: 1,6). Conclusiones. Se presenta un mapa de la distribución de los homicidios por barrio y se comentan los beneficios del modelo de vigilancia de base poblacional, en especial su valor para identificar los factores de riesgo y las medidas para prevenir y controlar este tipo de violencia.

Introduction: Dengue is a priority public health problem. During epidemics in Cuba and Haiti, ethnic African descendant population had lower risk of dengue, and the ethnic factor was proposed as a protective one. Objective: To determine the relation between the Dengue's cumulative incidence and the Afro-Colombian proportion in communities of Cali, during the epidemic of 2013. Methods: This study was conducted in Cali, Colombia. The design was ecological, using information from the National Census 2005 projected to 2013, from the National Administrative Department of Statistics (DANE), and the National Epidemiological Surveillance System. It was obtained the Pearson´s correlation coefficient between cumulative incidence and the proportion of Afro-Colombian population by communities. Additionally, the cumulative incidences of dengue were evaluated in two zones with different proportion of Afro-Colombian population. The association was also evaluated for aggregation bias, confounding by social variables, and interaction by area of ​​residence. Results: Dengue´s cumulative incidence was significantly lower for Afro-Colombians regardless of the proportion of Afro-Colombian population in the area of residence. The relative risk of dengue between non-AfroColombians and AfroColombians was 9.4 (95% CI=8.4-10.6) in zones with high proportion of Afro-Colombian population, while the relative risk of dengue was 4.0 (95% CI :3.6 - 4.4) in the zone with lower proportion of Afro-Colombian population. There was no evidence of aggregation bias or confounding in the association by social variables. Conclusions: The Afro-Colombian population had a significantly lower risk of getting dengue and its complications, compared with the non-Afro-Colombian population. The non-Afro-Colombian populations living in areas with a high proportion of AfroColombians increase their risk of dengue more than double, suggesting an asymptomatic viremic environment.

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The establishment and implementation of a combination of prevention strategies was more effective than a single or non-articulated strategy.