Introduction: Dengue Hemorrhagic Fever (DHF) is a disease caused by the dengue virus that infects the body. Dengue is a common viral infection in warm tropical climates. The infection is caused by one of four closely related dengue viruses. The disease now plagues many countries and even more than 100 countries within the WHO, including Africa, the Americas, the Eastern Mediterranean, Southeast Asia, and the Western Pacific. The Americas, Southeast Asia, and the Western Pacific are the most severely affected regions, with Asia representing 70% of the global disease burden. The high incidence rate of DHF in various regions of Indonesia is the background by several factors, one of which is the density of the seaters. The aim of this study was to analyze the correlation between population density and larvae free index and Incidence Rate (IR) Dengue Hemorrhagic Fever (DHF) in Blitar Regency in 2013-2017. Methods: The data were analyzed quantitatively using Spearman correlation tests to analyze relationships between variables. Result: The results of the analysis found there was no correlation between dengue fever incidence rate and larvae free index (p = 0.603 r = -0.117), and there was a correlation between the incidence rate of dengue fever and population density (p = 0.002 r = 0.619). Conclusion:  High population density is a risk factor for DHF events in Blitar Regency, so there needs to be an anticipation of preventive measures such as the implementation of 3M and counseling of the impact of high population density.

Background: Indonesia is one of the countries where 35% of the population lives in areas with a high risk of malaria infection. Trenggalek is one of the malaria-endemic regions in East Java. Purpose: This study aimed to identify the malaria cases in Trenggalek based on the epidemic triangle and identify the vulnerability status of Anopheles vagus mosquito against Permethrin 0.75% in Pandean Village, Trenggalek. Methods: This study is a type of descriptive observational study. The data used in this study is secondary data obtained from the The Center of Environmental Health and Disease Control Agency Surabaya. The data consists of characteristics of malaria cases in Trenggalek  and Anopheles vagus resistance test data against Permethrin 0.75% in Pandean Village, Trenggalek. Results: Trenggalek is considered as low malaria endemicity area, with malaria incidence dominated by imported malaria cases, because recently there is no cases of autochthonous malaria have been found. Data on malaria case trends in 2014-2017 tended to fluctuate, the majority of malaria patients were male group counting of 97.34% which consist of farmers (59.88%) and private sector worker (29.79%). The Anopheles vagus was found 100% death in one hour of the treatment, but there was no death incidence in the control group. Conclusion: Most malaria patients dominated by male, migrant workers, and most of them work as farmers and the private sector which have a high potential for the emergence of autochthonous malaria. Anopheles vagus is still susceptible to Permethrin 0.75% in Pandean Village, Trenggalek