Biting Pattern and Seasonality of Filariasis Vector of Mansonia spp. in Endemic Area of Banyuasin Regency, South Sumatera, Indonesia

The diversity and biting activity of Mansonia is important to be determined as to predict the incriminated vector and pattern the mosquito behaviour in establishing the vector control programme. The present study has been successfully conducted to investigate the prolonged biting behaviour of Mansonia spp. in two villages in Banyuasin Regency, South Sumatera Province-Indonesia, using Human Landing Collection method (HLC) in indoor and outdoor for 14 months. The result shows that there are 4956 Mansonia spp. mosquitoes collected during the study comprising 6 species: Mansonia uniformis (40.37%), Mansonia annulifera (32.04%), Mansonia indiana (19.97%), Mansonia bonneae (5.28), Mansonia dives (2.14%); and Mansonia annulata (0.18%). The further investigation confirms that Mansonia uniformis (41.254%) and Mansonia bonneae (45.490%) become the most dominant species caught in Sedang village and Muara Sugih village, respectively and find higher biting activities in outdoor than indoor with biting peaked time at approximately 18.00-19.00. However, the biting activities is also observed in daytime, indicating the behaviour change of Mansonia spp. as the nocturnal mosquitoes. Furthermore, the periods of the highest biting rates are found in April 2017 and May 2017 in Sedang village and May 2018 in Muara Sugih Village. The high period of biting activities and behaviours become the valuable information to arrange the further controlling action of filariasis transmission in Sedang and Muara Sugih Villages as the endemic area of filariasis in South Sumatera, Indonesia.

Efficacy of Commonly Used Mosquito Coils Containing Pyrethrin against Lymphatic Filariasis Vector Culex quinquefasciatus (Say) in Gombe

Aims: Mosquito coil is a common insect repellant used in many homes to repel and kill mosquitoes that transmit diseases and another insect pest. The present study was conducted to explore the potency of the commonly used brand of mosquito coil containing pyrethroids against Culex quinquefasciatus in Gombe and its communities. Place and Duration of Study: Department of Biological sciences insectary laboratory of Gombe State University, Gombe, Nigeria between August and December 2017. Methodology: Four (4) different brands tagged; C1, C2, C3 and C4 containing 0.08% Merperflutrin, 0.2% Pyrethroids, 0.05% Transflutrine + 0.1% Esbiothrin and 0.25% d-Trans-allethrin respectively were investigated. Ten (10) reared adult mosquitoes were transferred separately into various containers using an aspirator. Data on knockdown time and Adult mortality were recorded. All the data collected were analyzed using SPSS version 24.0. Analysis of Variance (ANOVA) was used to determine the significant difference between the treatments at P=.05. Results: Merperflutrin 0.08%, Transflutrine 0.05% + Esbiothrin 0.1% and 0.25% d-Transalletrin recorded highest mortality of 100% each and 0.2% Pyrethroids recorded 96% mortality at 24hours of exposure to the treatment respectively. The mortality is time- dependent and all the treatments show significant mortality at P=.05. Transflutrine 0.05% + Esbiothrin 0.1% recorded the lowest KT50 value of 2.41 min. Conclusion: Merperflutrin 0.08%, and Transflutrine 0.05% + Esbiothrin 0.1% have the highest efficacy; faster knockdown rate and could be used as a repellent in minimizing the population of the indoor resting density of mosquitoes’ species in our homes.

Control of filariasis vector using Ovillanta in Gwale local Government area of Kano State, Nigeria

The study was aimed at finding the effectiveness of a physical method of controlling filariasis vector larvae. Four ovillanta traps were placed in four different sites (north, south, west and east) of Gwale Local Government area of Kano state. The eggs and immature stage(larvae) of the filariasis vector were collected and destroyed. A total of 134667 larvae were collected altogether. 25% from site A, 23% from site B, 28% from site C and 24% from site D.The finding of the study shows that ovillanta trap is an effective method in controlling filariasis vector.

Nanoinsecticidal Efficacy of Ag/Ni Bimetallic Nanoparticles (BMNPs) on Lymphatic Filariasis Vector

Aims: Nanoparticles are gradually gaining wide scientific interest due to their various applications in catalysis, magnetism, medicine, optics, as antibacterial and nanolarvicidal agents. This research aimed at evaluating the larvicidal activity of green synthesized Ag/Ni BMNPs from the aqueous root extract of Borassus aethiopum as the stabilizing agent as well as their spectroscopic investigation using UV-Visible and FT-IR spectroscopy. Place and Duration of Study: The study was conducted in Gombe State University between August and December, 2019. Methodology: In this study, Ag/Ni hybrid bimetallic nanoparticles was synthesized using an eco-friendly method from the secondary metabolites of Borassus aethiopum acting as the reducing agent. Results: Optical measurements using UV-Vis showed the maximum absorption wavelength at 410nm while the FT-IR result for the root extract showed peaks at 3443.26cm-1, 2929.48 cm-1, 1651.28 cm-1, and 1080.12 cm-1 corresponding to OH stretch, sp3 C-H stretch, C=C stretch and C-O-C stretching respectively. These were replaced in the spectra of the BMNPs with the absence and appearance of some others indicating that they were involved in the capping process. The lethal concentration (LC50) was found to be 5.730, 13.585 and 15.735 mg/L for 1st, 2nd and 3rd/4th instars respectively. Also, the lethal concentration (LC90) was found to be 88.444, 195.689 and 236.889 mg/L for 1st, 2nd and 3rd/4th instars respectively. Conclusion: The larvicidal bioassay result showed a dose-dependent mortality rates against Culex quinquefasciatus larvae which suggest they can be developed to control the insect population.

Keanekaragaman Spesies Nyamuk di Daerah Transmission Assesment Survey (TAS) Filariasis di Kabupaten Enrekang, Provinsi Sulawesi Selatan

Enrekang Regency was declared to have passed third Transmission Assesment Survey (TAS), since there were no positive Brugia Malayi in elementary school students. The aspect of filariasis vector must be considered in this disease transmission. This study aims to determine the diversity of mosquitoes and their potential as vectors of filariasis in the TAS area in Enrekang Regency, South Sulawesi Province. This research is part of a multicenter study in 2017. This study was conducted with a cross-sectional study. Mosquitoes were collected in Parombean Village and Potokulin Village by modifying the Human Landing Catches (HLC) method with the human-baited double net trap from 18:00 to 06:00. The results showed that 30 species found in Parombean Village, consisted eight genera and Culex vishnui was the most abundant species. In Potokulin Village, 11 species were found consisted in five genera and Cx. quinquefasciatus was the most abundant species. The average age of mosquitoes was around 8-24 days. The species of mosquito as vector potential of filariasis in this area is Cx. vishnui, Cx, quinquefasciatus, and Anopheles barbirostris.

Culex vishnui Sebagai Vektor Filariasis Potensial di Kabupaten Kuantan Singingi, Provinsi Riau

Kuantan Singingi District is one of the endemic areas of filariasis in Riau Province. Mass treatment activities have been done, but the results of TAS-1 in 2016 with Brugia Rapid Test still found 11 positive children, this condition indicates that there is still new transmission in Kuantan Singingi Regency. The purpose of this study was to determine the mosquito species which potentially become vector filariasis - and to determine the types of potential breeding habitats for mosquito larvae. This research was done in Pulau Panjang Cerenti Village, Cerenti District and Sukadamai Village, Singingi Hilir District in September and November 2017. Catching mosquitoes held for 12 hours starting at 18.00 -06.00 WIB, using the modification of human landing collection double net method. Mosquito catching was done twice, with an interval of one month, at three points/locations for two consecutive nights. There were 24 species of mosquito caught in the two villages. The most dominant species in Pulau Panjang Village was Culex vishnui (54.89%) with indoor and outdoor MHD were 4.5; 16.08 species/man/hour, Sukadamai Village was Culex quinquefasciatus (95.42%) with indoor and outdoor MHD were 23.58; 19.08 species/man/hour. PCR examination results on mosquitoes caught in Sukadamai Village was found microfilarian DNA B. malayi in Cx.vishnui, so potentially become filariasis vector. Breeding habitats that are found mostly was fish ponds that are no longer used, puddles, and swamps. Riverfront habitats was only found in Pulau Panjang Village. Keywords: filariasis, Culex vishnui, potential vector, habitats, Kuantan Singingi Abstrak. Kabupaten Kuantan Singingi merupakan satu diantara wilayah endemis filariasis di Provinsi Riau. Kegiatan pengobatan massal telah dilakukan, namun hasil TAS-1 tahun 2016 dengan Brugia Rapid Test masih ditemukan 11 anak positif. Kondisi ini menunjukan bahwa masih terjadi penularan baru di Kabupaten Kuantan Sengingi. Tujuan penelitian ini untuk mengetahui spesies nyamuk yang berpotensi menjadi vektor filariasis dan mengetahui jenis-jenis habitat perkembangbiakan potensial bagi larva nyamuk. Pengumpulan data telah dilakukan di Desa Pulau Panjang Cerenti Kecamatan Cerenti dan Desa Sukadamai Kecamatan Singingi Hilir pada bulan September dan November 2017. Penangkapan nyamuk dilakukan selama 12 jam dimulai dari pukul 18.00 -06.00 WIB, menggunakan metode modifikasi human landing collection double net. Penangkapan nyamuk dilakukan sebanyak dua kali, dengan selang waktu satu bulan, pada tiga titik/lokasi selama dua malam berturut-turut. Spesies nyamuk yang tertangkap di dua desa sebanyak 24 spesies. Spesies yang paling dominan di Desa Pulau Panjang yaitu Culex vishnui (54,89%) dengan MHD di luar dan dalam rumah yaitu 4,5 dan 16,08 ekor/orang/jam, sedangkan di Desa Sukadamai yaitu Cx. quinquefasciatus (95,42%) dengan MHD di luar dan dalam rumah yaitu 23,58 dan 19,08 ekor/orang/jam. Hasil pemeriksaan PCR pada nyamuk yang tertangkap di Desa Sukadamai ditemukan DNA mikrofilaria B. malayi pada nyamuk Cx. vishnui sehingga berpotensi menjadi vektor filariasis. Habitat perkembangbiakan yang ditemukan sebagian besar adalah kolam ikan yang sudah tidak digunakan lagi, genangan air, dan rawa. Habitat tepi sungai hanya ditemukan di Desa Pulau Panjang. Kata Kunci: filariasis, Culex vishnui, vektor potensial, habitat, Kuantan Singingi