1.The Effectiveness of A Floor Gully with Grating to Prevent the Oviposition of Aedes (Stegomyia) Aegypti (Linneaus): A Laboratory Study
Chen, Chee Dhang ; Teoh Pei Sze ; Wan-Norafikah Othman ; Mohd Sofian-Azirun ; Lee Han Lim.
Malaysian Journal of Health Sciences 2009;7(1):73-80
This study was conducted to evaluate the effectiveness of a floor gully come with grating to prevent the oviposition of Aedes aegypti in the floor trap. In
order to conduct the test, two containers were placed into a mosquito cage (30 cm × 30 cm × 30 cm). Both containers were filled with declorinated seasoned tap water and covered with floor gully c/w grating and normal floor
gully, respectively. A total of 50 gravid Ae. aegypti females were then released into the cage and left for a week. All the eggs obtained from the test were
allowed to remain inside the containers for the eggs to hatch. The number of hatched larvae was counted and recorded. Five replicates were conducted
concurrently. There was a significant difference of Ae. aegypti larvae obtained between container with floor gully c/w grating and normal floor gully (p <0.05). A total of 96.41% reduction of Ae. aegypti larvae was obtained in the
container with floor gully c/w grating compared with the normal floor gully, indicating that the floor gully c/w grating used in this study was able to
prevent oviposition of Ae. aegypti in holding water.
2.A new record of Bengalia emarginata Malloch, 1927 (Diptera: Calliphoridae) from Malaysia.
Chong Chin Heo ; Hiromu Kurahashi ; Abdullah Marwi Mohamad ; John Jeffrey ; Chen Chee Dhang ; Raja Mohd Zuha ; Baharudin Omar
Tropical biomedicine 2008;25(3):262-3
During a forensic entomological study conducted at an oil palm plantation in Tanjung Sepat, Kuala Langat, Selangor, a Bengalia emarginata Malloch, 1927 (Diptera: Calliphoridae: Calliphorinae: Bengalini) was collected for the first time. Two adults were collected nearby the pig carcass by the first author and identified by the second. Prior to this finding, nine species of Bengalia were recorded from peninsular Malaysia or Borneo. Male of B. emarginata are different from Bengalia varicolor Fabricious by the following characters: Sternite 5 projection rounded with small identation and mid tibia double-fringed in ventral surface.
Calliphoridae
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Malaysia
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Diptera
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Upper case Bee
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Status pre-
3.Dengue vector surveillance in urban residential and settlement areas in Selangor, Malaysia.
Chee Dhang Chen ; Seleena Benjamin ; Mohd Masri Saranum ; Yee Fook Chiang ; Han Lim Lee ; Wasi Ahmad Nazni ; Mohd Sofian-Azirun
Tropical biomedicine 2005;22(1):39-43
Ovitrap surveillance was conducted in two urban residential areas (Taman Samudera Timur and Taman Samudera Selatan) and in a settlement area (Kampung Banjar), which is located 16 km from Kuala Lumpur city center, Malaysia. In Taman Samudera, dengue cases were reported monthly in 2003/2004. Thus, a study was initiated to determine the distribution and abundance of dengue vectors, Aedes aegypti and Ae. albopictus. The ovitrap surveillance indicated that Ae. aegypti and Ae. albopictus were present both indoors and outdoors. The residential sites had 73 - 79% of the ovitraps with just Ae. aegypti population and Kg. Banjar had 56% of the ovitraps with just Ae. aegypti. In the indoor and outdoor of the residential areas, together with the settlement area, the Ae. aegypti density was significantly more than Ae. albopictus (p < 0.05) by 3 - 50 folds. There was no significant difference in the larval numbers of Ae. aegypti between indoors and outdoors (p > 0.05), thus implicating that adult gravid female Ae. aegypti are present both indoors and outdoors and they do oviposit indoors and outdoors. Ae. aegypti can be incriminated as the principal dengue vector in the urban residential site, Taman Samudera and in the settlement area, Kg. Banjar.
Dengue
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legal surveillance
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Malaysia
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lower case pea
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Distributing
4.Butterflies (Lepidoptera: Nymphalidae) Associated with Pig Carrions in Malaysia
Heo Chong Chin ; Mohamad Abdullah Marwi ; John Jeffery ; Sofian-Azirun M ; Chen Chee Dhang ; Wan Omar Abdullah ; Ismarulyusda Ishak ; Baharudin Omar
Malaysian Journal of Health Sciences 2010;8(1):1-4
An entomological study was conducted in Tanjung Sepat, Selangor, Malaysia in May until September 2007 revealing
five species of butterflies (all from family Nymphalidae) were attracted to pig carcasses placed in an oil palm plantation. Euploea mulciber (Cramer 1777), Hypolimnas bolina (Linnaeus 1758), Elymnias hypermnestra (Linnaeus 1763), Mycalesis mineus (Linnaeus 1758) and Ypthima baldus (Fabricius 1775) came to the carcasses at different stages of decomposition. From this study, we know that nymphalid butterflies are attracted to carcasses but their roles are most probably unimportant in post-mortem estimation.
5.First report of the signal fly, Scholastes sp. (Diptera:Platystomatidae) visiting animal carcasses in Malaysia.
Chen Chee Dhang ; Chong Chin Heo ; David McAlpine ; Hiromu Kurahashi ; Nazni Wasi Ahmad ; Abdullah Marwi Mohamad ; John Jeffery ; Lee Han Lim ; Baharudin Omar ; Mohd Sofian-Azirun
Tropical biomedicine 2008;25(3):264-6
Signal fly, Scholastes sp. (Diptera: Platystomatidae) was observed associated with animal carcasses in Malaysia. The first observation was on a monkey carcass, which was killed by using a handgun and immediately placed in a forested area in Gombak, Selangor while the second observation was on a pig that died of natural causes and whose carcass was placed in an oil palm plantation in Tanjung Sepat, Selangor. Both animal carcasses were visited by Scholastes sp. flies during the fresh decomposition period. However, the role Scholastes flies in the decomposition process remains unknown. In this paper, we report the occurrence of Scholastes sp. on animal carcasses in Malaysia for the first time.
Diptera
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Animals
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Malaysia
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Patient observation
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First
6.Comparative insect fauna succession on indoor and outdoor monkey carrions in a semi-forested area in Malaysia
Ahmad Wasi Nazni ; Lim Han Lee ; Dhang Chee Chen ; Chin Chong Heo ; AG Abdullah ; Mustaffa Wan Wan-Norjuliana ; Kian Wai Chew ; Jeffery John ; Hashim Rosli ; Azirun Mohd Sofian
Asian Pacific Journal of Tropical Biomedicine 2011;(z2):232-238
Objective: To study the occurrence of insects fauna obtained in a semi forested area in Malaysia using the carcass of the monkey Macaca fascicularis, Raffles, and to compared the wave of insect succession collected from the carcass placed outdoor and indoor. Methods:The outdoor and indoor studies were conducted at a location of 3o17’57.86”N, 101o47’00.78”E. The euthanized monkeys were placed indoor and outdor. The insect seccession visited the carcass, the envirenmental temperature and relative humidity were recorded. Results:The main insects attracted to specific stages of decomposition were mainly members of Diptera and Coleoptera. There was a delay of fly arrival by two days in indoor carcass. Nocturnal oviposition behaviour was not observed in this study. The flies left the carcass during the twilight zone as noted during a 3 days observation period in outdoor study. The dipteran species found outdoor and indoor were similar but more diverse coleopteran species was found indoor. Conclusions:Information and evidence from this study can be used to improve the estimation of the post mortem interval in forensic cases.