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1.
Southeast Asian J Trop Med Public Health ; 1995 Jun; 26(2): 354-8
Article Dans Anglais | IMSEAR | ID: sea-33586

Résumé

The effect of permethrin impregnated bednets on Anopheles maculatus Theobald was studied in four villages in Pos Betau, Pahang, Malaysia from August 1990 to July 1992. Collections of mosquitos were carried out indoors and outdoors from 1900 to 0700 hours. All mosquitos were dissected for sporozoites and parity. In May 1991 two villages received bednets impregnated with permethrin at 0.5 g/m2 and two villages received placebo bednets. There was a significant difference in the sporozoite and parous rates between the treated and control villages after the distribution of bednets (p < 0.05). There was no significant difference in the bites/man/night of An. maculatus between the pre and post treatment periods in the control villages. However there was a significant difference in bites/man/night between pre and post treatment in the treated villages (p < 0.001).


Sujets)
Animaux , Anopheles/effets des médicaments et des substances chimiques , Literie et linges , , Vecteurs insectes/effets des médicaments et des substances chimiques , Insecticides/pharmacologie , Paludisme/prévention et contrôle , Malaisie/épidémiologie , Lutte contre les moustiques/méthodes , Hawaïen autochtone ou autre insulaire du Pacifique , Périodicité , Perméthrine , Pyréthrines/pharmacologie
2.
Southeast Asian J Trop Med Public Health ; 1993 Mar; 24(1): 138-42
Article Dans Anglais | IMSEAR | ID: sea-36014

Résumé

A field trial was carried out to study the effect of lambdacyhalothrin on Anopheles maculatus in trap huts in Jeram Kedah, Negeri Sembilan, Malaysia. Two trap huts were built, of which one was sprayed with lambdacyhalothrin at a dosage of 25 mg ai/m2 and the other served as control. Eight collectors commenced collecting mosquitos from 1900 to 2400 hours, two each indoors and outdoors. Bioassay was also carried out in the treated and control huts to determine susceptibility of adult mosquitos to lambdacyhalothrin. In the treated hut more mosquitos were present during the pre- spraying period. Lambdacyhalothrin gave a mortality of 100% against An. maculatus for 8 months.


Sujets)
Animaux , Anopheles , Insecticides , Malaisie , Lutte contre les moustiques/méthodes , Nitriles , Pyréthrines
3.
Southeast Asian J Trop Med Public Health ; 1991 Dec; 22(4): 643-7
Article Dans Anglais | IMSEAR | ID: sea-34913

Résumé

Mark-release-recapture experiments were undertaken in January 1989, in Pos Betau, Pahang, Malaysia, with the malaria vector Anopheles maculatus. On two consecutive nights, 121 and 175 blood-fed mosquitos were released. A mean recapture rate of 11.5% and survival rates of 0.699-0.705 with an estimated oviposition cycle period of 2.35 days were obtained from the releases. About 68% of all recaptures were taken within a distance of 0.5 km from their release points and the longest detected flight was 1.6 km. No heterogeneity was found between indoor and outdoor biters of An. maculatus.


Sujets)
Animaux , Anopheles/anatomie et histologie , Comportement animal , Culicidae , Femelle , Paludisme/transmission , Malaisie , Oviposition , Survie
4.
Southeast Asian J Trop Med Public Health ; 1990 Sep; 21(3): 412-7
Article Dans Anglais | IMSEAR | ID: sea-30980

Résumé

Field tests were conducted to compare the degree of protection from bites of Mansonia species and Anopheles maculatus by applying two repellent/insecticidal bars, MOSBAR and MOSKIL, to exposed arms and legs. Human test subjects were exposed to natural populations of mosquitos for an 8-hour night time period while using the repellent/insecticidal bars. MOSBAR gave good protection against the bites of Mansonia and An. maculatus. MOSKIL was effective against An. maculatus but not against Mansonia. High mortality was observed among the mosquitos collected from human test subjects treated with the repellent/insecticidal bars. Use of MOSBAR in terms of cost-effectiveness and safety by field and health workers entering into malaria and filariasis endemic areas is discussed.


Sujets)
Animaux , Culicidae , N,N-Diéthyl-méta-toluamide , Filarioses/prévention et contrôle , Humains , Insectifuges , Vecteurs insectes , Insecticides , Paludisme/prévention et contrôle , Malaisie , Perméthrine , Pyréthrines
5.
Southeast Asian J Trop Med Public Health ; 1990 Mar; 21(1): 115-22
Article Dans Anglais | IMSEAR | ID: sea-30578

Résumé

Descriptions of the eggs of Mansonia uniformis, Ma. indiana and Ma. annulifera are provided with the aid of scanning electron micrographs. Eggs of these three species, although similar in shape and colour, are covered by outer chorionic reticulum and tubercles which provide reliable morphological character for their identification. Size, distribution and number of lobes on the large tubercles present in the region between the anterior tube and posterior region, are important distinguishing features. Measurements of egg sizes and other chorionic differences are also discussed.


Sujets)
Animaux , Chorion/ultrastructure , Culicidae/ultrastructure , Femelle , Vecteurs insectes , Microscopie électronique à balayage , Ovule/ultrastructure
6.
Southeast Asian J Trop Med Public Health ; 1989 Jun; 20(2): 169-74
Article Dans Anglais | IMSEAR | ID: sea-32744

Résumé

Five strains of Ma. uniformis from Malaysia were tested for their susceptibility to infection with subperiodic B. malayi. All were found to be susceptible with infection rates ranging from 62% to 100%. The susceptibility rates were directly related to the microfilarial densities of the cat at the time of feeding. Statistical analysis showed no significant difference (p greater than 0.05) among the means of the indices of experimental infection as well as the percentage of infective mosquitoes of the five strains and an old laboratory colony. They were all equally susceptible to subperiodic B. malayi.


Sujets)
Animaux , Brugia/croissance et développement , Culicidae/parasitologie , Interactions hôte-parasite , Vecteurs insectes , Malaisie , Lutte biologique contre les nuisibles , Spécificité d'espèce
7.
Southeast Asian J Trop Med Public Health ; 1988 Jun; 19(2): 271-82
Article Dans Anglais | IMSEAR | ID: sea-36131

Résumé

Five mark-release-recapture experiments with wild caught Ma. uniformis were conducted in an open swamp area at Batang Berjuntai in Selangor, 40 km from Kuala Lumpur, Malaysia, between May 1983 and January 1985. A total of 64 (0.14%) from the 45,950 females released were recaptured feeding on humans and cattle and resting in cattle-sheds. Substantially fewer (0.03% to 0.09%) females were recaptured from releases of blood-fed females than from releases of unfed females (0.20% to 0.23%). More than 70% of all recaptures were taken within a radius of 1.5 km around the point of release and the longest detected flight was 3.5 km. The mean dispersal distance for blood-fed and unfed females was 1.445 +/- 1.06 and 1.706 +/- 1.03 km, respectively. However, there was no significant difference in the overall mean dispersal of the two groups of females (p greater than 0.05). The duration of the gonotrophic cycle in the field was between 3 to 4 days. Daily survivorship estimates (0.783-0.867) based on the recapture rates of date specific marked females was comparable to that estimated vertically from the dissection of unmarked females (0.751-0.795). These experiments revealed the remarkable flying ability of Ma. uniformis and the importance of reinvasion must be recognized when control operations are restricted to small areas.


Sujets)
Animaux , Culicidae/physiologie , Écologie , Femelle , Malaisie , Mâle , Ovaire/physiologie , Reproduction
8.
Southeast Asian J Trop Med Public Health ; 1985 Mar; 16(1): 10-4
Article Dans Anglais | IMSEAR | ID: sea-32893

Résumé

Field surveillance of Cq. crassipes was conducted in an open housing estate near Kuala Lumpur using IMR traps baited with chicken and gerbils. Chicken bait attracted more Cq. crassipes. There was significant difference between chicken and gerbil as bait. The mosquitoes preferred to feed at canopy level. The parous rate was 20.41% and the infection rate for Cardiofilaria nilesi was 2.04%. None of the 120 chicken and 5 ducks, in a village close to the open housing estate, examined for microfilariae were positive. Ar. durhami and Ar. subalbatus did not support development of C. nilesi. However, Cq. crassipes is an extremely efficient vector of C. nilesi.


Sujets)
Animaux , Culicidae/parasitologie , Dirofilaria/croissance et développement , Dirofilariose/transmission , Vecteurs insectes , Larve , Malaisie
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