Ovitrap surveillance of dengue vector mosquitoes in Bandung City, West Java Province, Indonesia

Abstract

Larval surveillance is the central approach for monitoring dengue vector populations in Indonesia. However, traditional larval indices are ineffective for measuring mosquito population dynamics and predicting the dengue transmission risk. We conducted a 14-month ovitrap surveillance. Eggs and immature mosquitoes were collected on a weekly basis from an urban village of Bandung, namely Sekejati. Ovitrap-related indices, namely positive house index (PHI), ovitrap index (OI), and ovitrap density index (ODI), were generated and correlated with environmental variables, housing type (terraced or high-density housing), ovitrap placement location (indoor or outdoor; household or public place), and local dengue cases. Our results demonstrated that Aedes aegypti was significantly predominant compared with Aedes albopictus at each housing type and ovitrap placement location. Ovitrap placement locations and rainfall were the major factors contributing to variations in PHI, OI, and ODI, whereas the influences of housing type and temperature were subtle. Indoor site values were significantly positively correlated to outdoor sites’ values for both OI and ODI. OI and ODI values from households were best predicted with those from public places at 1- and 0-week lags, respectively. Weekly rainfall values at 4- and 3-week lags were the best predictors of OI and ODI for households and public places, respectively. Monthly mean PHI, OI, and ODI were significantly associated with local dengue cases. In conclusion, ovitrap may be an effective tool for monitoring the population dynamics of Aedes mosquitoes, predicting dengue outbreaks, and serving as an early indicator to initiate environmental clean-up. Ovitrap surveillance is easy for surveyors if they are tasked with a certain number of ovitraps at a designated area, unlike the existing larval surveillance methodology, which entails identifying potential breeding sites largely at the surveyors’ discretion. Ovitrap surveillance may reduce the influence of individual effort in larval surveillance that likely causes inconsistency in results.

Risk Assessment on the Release of Wolbachia-Infected Aedes aegypti in Yogyakarta, Indonesia

“…In Indonesia, control measures have been promoted through the 3M plus (covering, draining, and burying unused water containers) program as shown in the declining DHF incidence rate [ 39 , 40 ]. However, available data have indicated that mosquito populations remain high [ 41 ], so that pesticides are still commonly used as an alternative measure in mosquito control in many locations in Indonesia. Therefore, the experts agreed that it has a very low likelihood with a low consequence, which resulted in a negligible risk of severity level.…”

A Review on Vector Borne Disease Transmission: Current Strategies of Mosquito Vector Control

“…For long-term vector surveillance, an ovitrap surveillance system is an alternative tool. Ovitrap is a user-friendly and effective tool for monitoring dengue vectors and is applied in various countries like Singapore, Australia, Indonesia (Sasmita et al, 2021). A lethal oviposition trap was used to attract gravid female mosquitoes, subsequently laying eggs.…”

Faktor yang Berhubungan dengan Pola Pengelompokkan Kasus Demam Berdarah Dengue (DBD) di Temanggung, Jawa Tengah

“…Surveilans vektor khususnya dilakukan saat curah hujan mulai masuk pada bulan basah dengan menentukan distribusi, kepadatan populasi, habitat larva, dan faktor risiko spatiotemporal terkait penularan dengue. 46,47,48,49 Surveilans migrasi pada program malaria dapat diadopsi menjadi strategi untuk mengurangi risiko penularan DBD karena proses mobiliasi masyarakat. Surveilans ini merupakan sistem pencatatan, pelaporan, pemantauan dan evaluasi terhadap perpindahan (mobilitas penduduk) baik yang datang maupun pergi ke luar wilayah dan dilakukan secara terus menerus serta berkelanjutan.…”