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47 results on '"Tan, Tiong Kai"'

11. Detoxification Enzymes: A Cornerstone of Rampant Insecticide Resistance in Aedes Albopictus (Diptera: Culicidae) from Sabah, Malaysia

Author

Mohd Roslin, Nur Elia Amira, primary, Chen, Chee Dhang, additional, Low, Van Lun, additional, Lau, Koon Weng, additional, Rashid, Amirah Haziqah, additional, Yap, Amelia Zheng Hua, additional, Tan, Tiong Kai, additional, Lim, Yvonne Ai Lian, additional, Lee, Han Lim, additional, and Azirun, Mohd Sofian, additional

Published
2023
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14. First Report of Rickettsia Asembonensis in Small Ruminants

Author

Low, Van Lun, primary, Azhar, Siti Sarah, additional, Tan, Tiong Kai, additional, Bathmanaban, Premaalatha, additional, AbuBakar, Sazaly, additional, Chandrawathani, Panchadcharam, additional, Nizamuddin, Hassan Nizam Quaza, additional, Hanim, Mohd Saeid Faizah, additional, Akma, Ngah Hamid, additional, Norlizan, Mohd Noor, additional, and Lim, Yvonne Ai Lian, additional

Published
2022
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17. Bioefficacy of mosquito mat vaporizers and associated metabolic detoxication mechanisms in Aedes aegypti (Linnaeus) in Selangor, Malaysia: A statewide assessment

Author

Taib, Azratul Hizayu, Chen, Chee Dhang, Lau, K. W., Abdul Wahid, Noor Azrizal, Tan, Tiong Kai, Lim, Yvonne Ai Lian, Azirun, Mohd Sofian, Low, Van Lun, Taib, Azratul Hizayu, Chen, Chee Dhang, Lau, K. W., Abdul Wahid, Noor Azrizal, Tan, Tiong Kai, Lim, Yvonne Ai Lian, Azirun, Mohd Sofian, and Low, Van Lun

Abstract

This study aims to examine the efficacy of mosquito mat vaporizers on Aedes aegypti and their associated metabolic detoxication mechanisms. For this purpose, Aedes aegypti (Linnaeus) was collected from nine districts in Selangor, Malaysia and tested with mosquito vaporizing mat bioassays. The same populations were also subjected to biochemical assays to investigate activities of detoxifying enzymes, namely non-specific esterase (EST), glutathione-S-transferase (GST) and mixed function oxidase (MFO). The efficacy of Ae. aegypti on the active ingredients tested in decreasing order were d- allethrin > dimefluthrin > prallethrin with PBO > prallethrin. The results further indicated significant enhancement mean levels of EST, GST and MFO in pyrethroid-resistant populations. The mortality rate of Ae. aegypti in response to pyrethroid active ingredients was associated with MFO activity, suggesting it is an important detoxification enzyme for the populations tested. In view of the presence of resistance against household insecticide products, pyrethroid efficacy on Ae. aegypti populations needs to be monitored closely to ensure the implementation of an effective vector control program in Malaysia.

Published
2021

18. Identification of potential vectors of Dirofilaria immitisand Brugia pahangi(Spirurida: Filariidae): First observation of infective third-stage larva of B. pahangiin Culex quinquefasciatus(Diptera: Culicidae)

Author

Vinnie-​Siow, Wei Yin, Low, Van Lun, Tan, Tiong Kai, Wong, Meng Li, Leong, Cherng Shii, Ahmad, Nazni Wasi, and Lim, Yvonne Ai Lian

Abstract

ABSTRACTInformation on the mosquito species that transmit canine filariosis is scanty. Hence, an experimental study was conducted to identify the potential vectors responsible for the transmission of D. immitisLeidy and B. pahangiBuckley & Edeson. A total of 367 mosquitoes belonging to six species containing both laboratory and field strains (i.e. Aedes togoiTheobald, Aedes aegyptiLinnaeus, Aedes albopictusSkuse, Culex quinquefasciatusSay, Culex vishnuiTheobald and Anopheles dirusPeyton & Harrison) were used in this study. All mosquitoes were artificially fed on either D. immitisor B. pahangi microfilariae (mfs) infected blood by using the Hemotek™ membrane feeding system. Out of 367 mosquitoes, 228 (64.9%) were fully engorged. After feeding on D. immitis(20%) and B. pahangi(33%) mfs positive blood, the mortality rates for Cx. quinquefasciatuswere found to be slightly lower than that of other species of mosquitoes. On the other hand, majority of An. diruswere found to be incapable to withstand the infection of mfs as the mortality rates were relatively high (D. immitis = 71.4%; B. pahangi = 100.0%). Brugia pahangiwas detected in Ae. togoiand Cx. quinquefasciatuswith infection rates of 50% and 25%, respectively. Aedes togoiwas the only species infected with D. immitiswith an infection rate of 69%. Our results showed that Ae. togoiwas an excellent experimental vector for both D. immitisand B. pahangi. This study also documented the observation of B. pahangi, for the first time in the head region of Cx. quinquefasciatus under a laboratory setting.

Published
2022
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24. Sexually anomalous individuals of the black fly Simulium trangense (Diptera: Simuliidae) infected with mermithid parasites (Nematoda: Mermithidae).

Author

Ya'cob, Zubaidah, Low, Van Lun, Tan, Tiong Kai, Noor-Izwan, Anas, Lourdes, Emmanuel Y., Ramli, Rosli, Takaoka, Hiroyuki, and Adler, Peter H.

Subjects
SIMULIIDAE, DIPTERA, NEMATODES, FEMALE reproductive organs, MALE reproductive organs
Abstract

Sexually anomalous individuals, typically intersexes or gynandromorphs, bear a mixture of male and female traits. Twelve sexually anomalous individuals of the black fly Simulium (Gomphostilbia) trangense Jitklang, Kuvangkadilok, Baimai, Takaoka & Adler were discovered among 49 adults reared from pupae. All 12 sexually anomalous adults were parasitized by mermithid nematodes, although five additional parasitized adults had no overt external anomalies. Sequence analysis of the 18S rRNA gene revealed that the mermithids, possibly representing a new species, are related to Mesomermis spp., with genetic distances of 5.09–6.87%. All 12 anomalous individuals had female phenotypical traits on the head, thorax, forelegs, midlegs, and claws, but male features on the left and right hind basitarsi. One individual had mixed male and female genitalia. The findings are in accord with the trend that mermithid infections are associated with sexually anomalous adult black flies. [ABSTRACT FROM AUTHOR]

Published
2021
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26. Pyrethroids Use: Threats on Metabolic-Mediated Resistance Mechanisms in the Primary Dengue Vector Aedes aegypti (Diptera: Culicidae)

Author

Amelia-Yap, Zheng Hua, primary, Sofian-Azirun, Mohd, additional, Chen, Chee Dhang, additional, Suana, I Wayan, additional, Lau, Koon Weng, additional, Elia-Amira, Nur Mohd Roslin, additional, Haziqah-Rashid, Amirah, additional, Tan, Tiong Kai, additional, Lim, Yvonne Ai Lian, additional, and Low, Van Lun, additional

Published
2019
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35. Contrasting evolutionary patterns between two haplogroups of Haematobia exigua (Diptera: Muscidae) from the mainland and islands of Southeast Asia

Author

Low, Van Lun, primary, Tan, Tiong Kai, additional, Prakash, Batah Kunalan, additional, Vinnie-Siow, Wei Yin, additional, Tay, Sun Tee, additional, Masmeatathip, Roungthip, additional, Hadi, Upik Kesumawati, additional, Lim, Yvonne Ai Lian, additional, Chen, Chee Dhang, additional, Norma-Rashid, Yusoff, additional, and Sofian-Azirun, Mohd, additional

Published
2017
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37. DNA Barcoding of Simulium asakoae(Diptera: Simuliidae) From Northern Thailand

Author

Low, Van Lun, Srisuka, Wichai, Saeung, Atiporn, Tan, Tiong Kai, Ya’cob, Zubaidah, Yeong, Yze Shiuan, and Takaoka, Hiroyuki

Abstract

Previous studies suggested the presence of species complex in the so-called Simulium asakoaeTakaoka & Davies (Diptera: Simuliidae) in Thailand due to its high morphological variability and genetic divergence. To investigate whether the true S. asakoaeis present in Thailand, we performed a detailed morphological identification of S. asakoaeand compared its DNA barcodes with the morphospecies S. asakoaefrom Myanmar and the typical S. asakoaefrom Malaysia. Phylogenetic analysis revealed the Thai materials analyzed in this study were indeed genetically similar with those from Myanmar and Malaysia, though genetic distances 0–2.27% were observed. We tentatively regard this divergence as intraspecific variation, and the automatic barcode gap discovery analysis further supports them as a single species.

Published
2020
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39. A New Black Fly Species of the Simulium(Gomphostilbia) duolongumSubgroup (Diptera: Simuliidae) From Vietnam, and Molecular Comparisons With Related Species Using the COI Barcoding Gene

Author

Takaoka, Hiroyuki, Low, Van Lun, Tan, Tiong Kai, Ya’cob, Zubaidah, Sofian-Azirun, Mohd, Dhang Chen, Chee, Lau, Koon Weng, and Da Pham, Xuan

Abstract

Simulium(Gomphostilbia) yvonneaesp. nov. is described based on adults, pupae, and mature larvae from Vietnam. This new species belongs to the Simulium duolongumsubgroup in the S. batoensespecies-group of the subgenus GomphostilbiaEnderlein. It is distinguished by having a relatively larger number of male upper-eye facets in 16 vertical columns and 16 horizontal rows and a pupal gill with eight filaments arranged as 3+(1+2)+2 from dorsal to ventral, of which two filaments of the ventral pair are 1.8 times as long as the longest filament of the middle and dorsal triplets. Morphological comparisons are made to distinguish this new species from all 22 related species. The genetic distinctiveness of this new species in the S. duolongumsubgroup is also presented based on the DNA barcoding COI gene.

Published
2019
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41. Molecular characterisation of the tick Rhipicephalus microplus in Malaysia: new insights into the cryptic diversity and distinct genetic assemblages throughout the world

Author

Low, Van Lun, primary, Tay, Sun Tee, additional, Kho, Kai Ling, additional, Koh, Fui Xian, additional, Tan, Tiong Kai, additional, Lim, Yvonne Ai Lian, additional, Ong, Bee Lee, additional, Panchadcharam, Chandrawathani, additional, Norma-Rashid, Yusoff, additional, and Sofian-Azirun, Mohd, additional

Published
2015
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42. A novel clade of bat-associated Bartonella detected in the bat fly Leptocyclopodia ferrari (Diptera: Nycteribiidae) parasitizing Cynopterus brachyotis (Chiroptera: Pteropodidae).

Author

Low, Van Lun, Tan, Tiong Kai, Tohiran, Kamil Azmi, Lim, Yvonne Ai Lian, AbuBakar, Sazaly, and Nasir, Dzulhelmi Muhammad

Subjects
*BATS, *BARTONELLA, *BARTONELLA henselae, *EMERGING infectious diseases, *CITRATE synthase, *DIPTERA
Abstract

• A novel clade of bat-associated Bartonella was detected in Leptocyclopodia ferrari bat flies. • Both 16 S–23 S rRNA and gltA sequences exhibited < 95 % similarity to all previously reported Bartonella spp. • New insight into the diversity of bartonellae associated with bats worldwide. Bartonelloses are emerging infectious diseases that are common in humans and animals worldwide. Several Bartonella species associated with companion animals such as Bartonella henselae and Bartonella rochalimae are species with zoonotic implications and have become a global concern. Other Bartonella species associated with wild animals, however, remain underappreciated particularly in the developing regions of the world. To explore further on this neglected bacterial agent, Leptocyclopodia ferrari (Nycteribiidae) bat flies collected from Cynopterus brachyotis (Pteropodidae), an endemic fruit bat species in Southeast Asia, were molecularly examined for the presence of Bartonella. Both 16 S–23 S ribosomal RNA intergenic spacer region and citrate synthase gene sequences exhibited less than 95 % similarity to all previously reported Bartonella spp. Further phylogenetic analysis revealed a novel clade of this Bartonella sp. with high bootstrap support. The vectorial capacity of bat flies in transmitting this novel pathogen merits further investigation. [ABSTRACT FROM AUTHOR]

Published
2022
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44. Description of the female of Simulium (Gomphostilbia) aziruni (Diptera: Simuliidae) and its genetic relationships with members of the Simulium gombakense species-group.

Author

Ya'cob, Zubaidah, Takaoka, Hiroyuki, Low, Van Lun, Tan, Tiong Kai, and Sofian-Azirun, Mohd

Subjects
*CYTOCHROME oxidase, *SIMULIIDAE, *DIPTERA, *GENETIC distance, *FEMALES
Abstract

Abstract Simulium (Gomphostilbia) aziruni Takaoka, Hashim & Chen was described initially based only on a pupa and a mature larva collected from Peninsular Malaysia. Herein, we describe the morphological characters of the female of S. aziruni for the first time. It resembles those of the other members of the Simulium gombakense species-group by the genital fork with a distinct projection directed medioposteriorly from each arm and claw with a large basal tooth. Cytochrome c oxidase I (COI) barcoding analysis indicates that S. aziruni is the sister species of S. maleewongae , but both are distantly separated by a genetic distance of 4.9%. [ABSTRACT FROM AUTHOR]

Published
2019
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46. A New Black Fly Species of the Simulium (Gomphostilbia) duolongum Subgroup (Diptera: Simuliidae) From Vietnam, and Molecular Comparisons With Related Species Using the COI Barcoding Gene.

Author

Takaoka H, Low VL, Tan TK, Ya'cob Z, Sofian-Azirun M, Dhang Chen C, Lau KW, and Da Pham X

Subjects
Animals, DNA Barcoding, Taxonomic, Electron Transport Complex IV genetics, Female, Larva anatomy & histology, Male, Phylogeny, Pupa anatomy & histology, Simuliidae anatomy & histology, Simuliidae genetics, Species Specificity, Simuliidae classification
Abstract

Simulium (Gomphostilbia) yvonneae sp. nov. is described based on adults, pupae, and mature larvae from Vietnam. This new species belongs to the Simulium duolongum subgroup in the S. batoense species-group of the subgenus Gomphostilbia Enderlein. It is distinguished by having a relatively larger number of male upper-eye facets in 16 vertical columns and 16 horizontal rows and a pupal gill with eight filaments arranged as 3+(1+2)+2 from dorsal to ventral, of which two filaments of the ventral pair are 1.8 times as long as the longest filament of the middle and dorsal triplets. Morphological comparisons are made to distinguish this new species from all 22 related species. The genetic distinctiveness of this new species in the S. duolongum subgroup is also presented based on the DNA barcoding COI gene., (© The Author(s) 2018. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Published
2019
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47. Detection of Babesia spp. in Dogs and Their Ticks From Peninsular Malaysia: Emphasis on Babesia gibsoni and Babesia vogeli Infections in Rhipicephalus sanguineus sensu lato (Acari: Ixodidae).

Author

Prakash BK, Low VL, Vinnie-Siow WY, Tan TK, Lim YA, Morvarid AR, AbuBakar S, and Sofian-Azirun M

Subjects
Animals, Babesia genetics, Malaysia, RNA, Ribosomal, 18S genetics, Babesia isolation & purification, Dogs parasitology, Rhipicephalus sanguineus parasitology
Abstract

Canine babesiosis is an emerging tick-borne disease with a worldwide distribution, including Malaysia. While the prevalence of Babesia has been documented from dogs in Malaysia, occurrence of Babesia has been relatively little studied in their tick vectors. Accordingly, a total of 240 dogs and 140 Rhipicephalus sanguineus sensu lato (s.l.) (Acari: Ixodidae) ticks from Malaysia were molecularly screened for the presence of Babesia protozoa in the present study. Babesia gibsoni was only detected in ticks (1.4%), whereas Babesia vogeli was detected in both ticks (1.4%) and dogs (2.1%). This study highlights the detection of B. gibsoni and B. vogeli for the first time, in both adult and nymphal stages of R. sanguineus s.l. in Malaysia, suggesting the potential role of this tick species in transmitting canine babesiosis.

Published
2018
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