Aedes aegypti is the most dominant vector in the transmission of dengue hemorrhagic fever (DHF). In addition to Ae. aegypti, Ae. albopictus is a secondary vector of the dengue virus, and both species are widespread in Indonesia. The dengue virus is transmitted from person to person through the bite of an Aedes spp. The vertical (transovarial) transmission of the dengue virus from infective female mosquitoes to their offspring is one of the means by which the dengue virus maintains its existence in nature. Transovarial dengue virus transmission in Aedes spp. mosquitoes contributes to the spread and maintenance of the dengue epidemic. This study employed a qualitative survey to detect dengue virus transovarial transmission in Ternate using the streptavidin-biotin-peroxidase complex (ISBPC) immunohistochemical test. The ISBPC examination of samples collected from the four subdistricts in Ternate revealed a positive result for transovarial transmission of dengue virus. Four Aedes spp., including two Ae. aegypti females, one Ae. albopictus female, and one Ae. albopictus male, tested positive for transovarial transmission of dengue virus in the district of North Ternate. Four Aedes spp., including three Ae. aegypti females and one Ae. aegypti male, were found to be positive for the transovarial transmission of dengue virus in the Central Ternate district. Seven Aedes spp., including five Ae. aegypti females, one Ae. aegypti male, and one Ae. albopictus female, tested positive for transovarial transmission of the dengue virus in the district of South Ternate city. One Ae. aegypti male showed positive results for transovarial transmission of dengue virus in the Ternate Island District. In this study, the transovarial transmission of the dengue virus occurred in both Aedes spp. female and male mosquitoes. It was demonstrated that Aedes spp. carry the dengue virus in their ovaries and can pass it on to their offspring. As a result, the cycle of passing the dengue virus on to local mosquito populations in the city of Ternate is not going to end just yet.

Aedes spp. are the primary vectors of arboviruses such as dengue, Zika, and chikungunya. To date neither an approved vaccine nor a drug that can definitively prevent or treat these diseases, vector control continues to be an essential method of disease prevention. Plant-based insecticides are an alternative to chemical insecticides because they are less toxic to non-target insects and degrade more quickly. The Papuan people have used Pangi leaves for generations as a potent natural chemical against head lice and mosquito larvae. This study aimed to evaluate the potential of pangi (Pangium edule) leaf extract as a biolarvicide and mosquito repellent. Fresh pangi leaves were extracted with water by using a blender to pulverize the leaves. One-way ANOVA was used to examine the variance in mortality rates, and the LC50 value was calculated for probit analysis. Dead larvae were identified and counted. In addition to testing the effectiveness of the extracts as biolarvicide, the extract was also tested as potential insect repellents. The findings demonstrated that pangi leaf extract can kill mosquito larvae. The concentration of the extract affected larval mortality. Furthermore, the extract demonstrated its effectiveness as an insect repellent. Pangi leaf extract contains alkaloids, flavonoids, tannins, saponins, phenolic compounds, and cyanide compounds, with alkaloids being the most abundant. The study found that there was a direct correlation between the concentration of the insecticide and the number of dead Aedes spp. larvae. The LC50 probit test revealed that pangi leaf extract belongs to the category of toxic substances. Several compounds, including alkaloids, flavonoids, tannins, saponins, and cyanide, may be responsible for the toxicity of pangi leaf extract. Thus, pangi leaf extract might be established as a means of overcoming numerous health issues caused by mosquito vectors.