Displaying publications 1 - 20 of 282 in total

  1. Chang MS, Jute N
    Med J Malaysia, 1982 Sep;37(3):205-10.
    PMID: 7176997
    A total of 73 localities covering 4,894 premises and 26, 712 breeding habitats were surveyed in 1980 to determine and establish the density and distribution pattern of Aedes aegypti and Aedes albopictus in Sarawak. A similar pattern has been observed in the density of the Aedes aegypti and Aedes albopictus. The number of houses positive with Aedes larvae were found to be highest in the coastal areas followed by the inland rural areas. The Aedes aegypti Breteau Index (B.I.) of 0-525 in the coastal areas is the highest followed by 0-207.5 in the inland rural areas. The study undertaken has now revealed that both the Aedes aegypti and Aedes albopictus are widespread in the State.
    Matched MeSH terms: Insect Vectors*
  2. Macdonald WW, Cheong WH, Loong KP, Mahadevan S
    PMID: 1981630
    An experiment was carried out with Mansonia mosquitos in an area endemic for subperiodic Brugia malayi to assess the applicability of the mark-release-recapture method to these mosquitos. An estimated 17,880 individuals of six species of Mansonia were marked with fluorescent dust and released: 453 Ma. annulata, 305 Ma. annulifera, 6,200 Ma. bonneae, 516 Ma. dives, 3,998 Ma. indiana and 6,408 Ma. uniformis. Twenty-three marked individuals were recaptured. Most recaptures were made one or two nights after their release, but one Ma. annulifera was recaptured five nights later and one Ma. bonneae had been marked and released 6-11 nights previously. The recaptured mosquitos were collected between 0.5 and 2.4 km from their release points.
    Matched MeSH terms: Insect Vectors
  3. Cheong WH, Mahadevan S
    PMID: 7147014
    Matched MeSH terms: Insect Vectors
  4. Bray DP, Yaman K, Underhilll BA, Mitchell F, Carter V, Hamilton JG
    PLoS Negl Trop Dis, 2014 Dec;8(12):e3316.
    PMID: 25474027 DOI: 10.1371/journal.pntd.0003316
    BACKGROUND: The sand fly Phlebotomus argentipes is arguably the most important vector of leishmaniasis worldwide. As there is no vaccine against the parasites that cause leishmaniasis, disease prevention focuses on control of the insect vector. Understanding reproductive behaviour will be essential to controlling populations of P. argentipes, and developing new strategies for reducing leishmaniasis transmission. Through statistical analysis of male-female interactions, this study provides a detailed description of P. argentipes courtship, and behaviours critical to mating success are highlighted. The potential for a role of cuticular hydrocarbons in P. argentipes courtship is also investigated, by comparing chemicals extracted from the surface of male and female flies.

    PRINCIPAL FINDINGS: P. argentipes courtship shared many similarities with that of both Phlebotomus papatasi and the New World leishmaniasis vector Lutzomyia longipalpis. Male wing-flapping while approaching the female during courtship predicted mating success, and touching between males and females was a common and frequent occurrence. Both sexes were able to reject a potential partner. Significant differences were found in the profile of chemicals extracted from the surface of males and females. Results of GC analysis indicate that female extracts contained a number of peaks with relatively short retention times not present in males. Extracts from males had higher peaks for chemicals with relatively long retention times.

    CONCLUSIONS: The importance of male approach flapping suggests that production of audio signals through wing beating, or dispersal of sex pheromones, are important to mating in this species. Frequent touching as a means of communication, and the differences in the chemical profiles extracted from males and females, may also indicate a role for cuticular hydrocarbons in P. argentipes courtship. Comparing characteristics of successful and unsuccessful mates could aid in identifying the modality of signals involved in P. argentipes courtship, and their potential for use in developing new strategies for vector control.

    Matched MeSH terms: Insect Vectors/physiology*
  5. Lim LH
    Gaoxiong Yi Xue Ke Xue Za Zhi, 1994 Dec;10 Suppl:S116-7.
    PMID: 7844839
    Matched MeSH terms: Insect Vectors*
  6. Lim KW, Sit NW, Norzahira R, Sing KW, Wong HM, Chew HS, et al.
    Trop Biomed, 2010 Aug;27(2):185-92.
    PMID: 20962714 MyJurnal
    A year-long ovitrap surveillance was conducted between November 2007 and October 2008 in two insular settlements (Kampung Pulau Ketam and Kampung Sungai Lima) within the Malaysian island of Pulau Ketam. Eighty standard ovitraps were placed indoors and outdoors of randomly selected houses/locations. Results demonstrated an endemic baseline Aedes population throughout the year without weekly large fluctuations. Kampung Pulau Ketam has high Aedes aegypti and Aedes albopictus population, but only Ae. aegypti was found in Kampung Sungai Lima. Aedes aegypti showed no preference for ovitraps placed indoor versus outdoor. However, as expected, significantly more outdoor ovitraps were positive for Ae. albopictus (p<0.05). Trends in Ae. albopictus and Ae. aegypti populations mirrored each other suggesting that common factors influenced these two populations.
    Matched MeSH terms: Insect Vectors/physiology*; Insect Vectors/virology*
  7. Vythilingam I, Keokenchan K, Phommakot S, Nambanya S, Inthakone S
    PMID: 11485101
    Malaria vector surveys were carried out in 8 provinces in Lao PDR in 1999. The surveys were conducted in 4 provinces - Savannakhet, Champasak, Luang Perbang and Sayaboury in May and in another 4 provinces - Bolikhamsay, Sarvan, Sekong and Vientiane in December 1999. Bare leg collection were carried out indoors and outdoors from 6 pm to 5 am. All anopheline mosquitos were identified, dissected and the gut, gland and ovaries were examined. A total of 438 Anopheles mosquitos belonging to 19 species were obtained. Of these only 3 species were found to be infected with oocysts - An. maculatus, An. dirus and An. minimus. All these species were found biting both indoors and outdoors. An. aconitus was the predominant species obtained in the December collection but its vectorial status remains unknown.
    Matched MeSH terms: Insect Vectors*
  8. Yap HH, Lee YW, Zairi J
    J. Am. Mosq. Control Assoc., 2002 Mar;18(1):52-6.
    PMID: 11998931
    Bioefficacy of thermal fogging application of 2 Bacillus thuringiensis israelensis formulations, Vectobac ABG 6511 water-dispersible granules (3,000 international toxic unit [ITU]/mg) and Vectobac 12AS liquid (1,200 ITU/mg), was assessed for larvicidal activities against Aedes aegypti, Aedes albopictus, Anopheles dirus, and Culex quinquefasciatus. Portable Agrofog AF35 sprayers were used to apply the 2 formulations indoors in residential premises on Penang Island, Malaysia. Vectobac ABG 6511 showed good larvicidal effect against all 4 mosquito species at 3 of the higher doses tested (2.91 x 10(9), 1.45 x 10(9), and 0.71 x 10(9) ITU/ha), with more than 96% mortality at 48 h after spraying. As a comparative formulation, Vectobac 12AS also showed good larvicidal activity against all 4 mosquito species at 2 of the higher doses tested (2.87 x 10(9) and 1.46 x 10(9) ITU/ha), with more than 92.5% mortality at 48 h after spraying. Larvae of An. dirus were significantly more susceptible to both water-based Vectobac formulations when compared to the other 3 mosquito species. Both microbial formulations showed better efficacy at higher doses. However, even at the lowest dose tested, Vectobac ABG 6511 and Vectobac 12AS (both at 0.36 x 10(9) ITU/ha) showed larvicidal properties, with more than 66% mortality at 48 h after spraying. Overall, for this bacterial agent, the water-dispersible granule formulation has better prospects than the liquid formulation for the control of larvae of vector mosquitoes.
    Matched MeSH terms: Insect Vectors*
  9. Sulaiman S, Pawanchee ZA, Arifin Z, Wahab A
    J. Am. Mosq. Control Assoc., 1996 Sep;12(3 Pt 1):494-6.
    PMID: 8887232
    The relationship between the Breteau index, the House index, and the occurrence of dengue/dengue hemorrhagic fever in the 6 zones of Kuala Lumpur was studied throughout 1994. Cases of dengue/dengue hemorrhagic fever varied between zones and between months, ranging from 0 to 21 cases. In most of the zones in Kuala Lumpur, the occurrence of dengue/dengue hemorrhagic fever has no relationship with the Breteau and House indices. Cases of dengue/dengue hemorrhagic fever occurred in all zones despite the low Breteau and House indices.
    Matched MeSH terms: Insect Vectors/virology
  10. Tham AS
    Malays J Pathol, 1993 Jun;15(1):13-9.
    PMID: 8277783
    Matched MeSH terms: Insect Vectors*
  11. Hii JL, Birley MH, Sang VY
    Med. Vet. Entomol., 1990 Apr;4(2):135-40.
    PMID: 2132976
    An exophilic population of the vector mosquito Anopheles balabacensis Baisas was investigated in two mark-recapture studies (16.ix-13.x.1986 and 6-26.i.1987) at an inland, foothill village in Sabah, Malaysia. Wild female mosquitoes were intercepted as they came to feed on man or buffalo, given a bloodmeal, marked with fluorescent dust and released. The recapture rate was about 12%. A new method of analysis is proposed which uses cross-correlation and a time series model. The estimated survival per oviposition cycle was 0.48-0.54 and the oviposition cycle interval 2-3 days.
    Matched MeSH terms: Insect Vectors/physiology*
  12. Khoon CC
    PMID: 4023806
    Matched MeSH terms: Insect Vectors*
  13. Hii JL, Kan S, Vun YS, Chin KF, Lye MS, Mak JW, et al.
    Trans R Soc Trop Med Hyg, 1985;79(5):677-80.
    PMID: 3913069
    Seven villages in Banggi Island, Sabah, Malaysia, were surveyed four times to evaluate the roles of local mosquitoes as vectors of malaria and Bancroftian filariasis. 11 species of Anopheles were found biting man. 53.9% of the anophelines caught were An. flavirostris, 27.1% An. balabacensis, 6% An. donaldi and 4.2% An. subpictus. Infective malaria sporozoites, probably of human origin, were found in two of 336 An. flavirostris and 12 of 308 An. balabacensis. Sporozoites, probably of a non-human Plasmodium, were found in An. umbrosus. Nine of 1001 An. flavirostris and four of 365 An. balabacensis harboured L2 or L3 filarial larvae identified as those of Wuchereria bancrofti. This is the first record of An. flavirostris as a natural vector of malaria and W. bancrofti in Sabah.
    Matched MeSH terms: Insect Vectors/parasitology*
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