Displaying publications 1 - 20 of 52 in total

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  1. A Case of Zoonotic Ancylostoma ceylanicum Infection in a Suburban Area of Selangor, Malaysia
    Heo CC, Rafiz AR, Ngui R
    Acta Parasitol, 2021 Oct 06.
    PMID: 34617193 DOI: 10.1007/s11686-021-00478-1
    INTRODUCTION: The animal hookworm, Ancylostoma ceylanicum, is a dominant hookworm species of dogs and cats. However, it has increasingly been found infecting humans in Southeast Asia.

    PURPOSE: We report an autochthonous case of A. ceylanicum in a suburban area of Selangor, Malaysia. A 66-year-old Indian lady who is an avid gardener presented with chronic diarrhea of 4 months' duration.

    METHODS: The patient was examined clinically and colonoscopy was performed. Adult parasites obtained via colonoscopy were subjected to microscopy and molecular investigations.

    RESULTS: Clinical examinations were unremarkable, and blood investigation revealed normochromic normocytic anemia. Stool occult blood was positive but negative for ova, cyst and adult parasites. Colonoscopy performed showed multiple diverticulae and worm infestation from the terminal ileum to sigmoid colon. Morphological examination on the adult worms showed the specific characteristics of Ancylostoma species. Molecular investigations further confirmed the nematode as Ancylostoma ceylanicum. She was treated with albendazole 400 mg daily for 3 days with symptomatic improvements sustained 3 months later. It is suspected that the patient had ingested or contacted soil contaminated with filariform larvae while gardening.

    CONCLUSION: Information on the A. ceylanicum infection in humans, especially in urban and suburban areas, is limited, necessitating further epidemiological and clinical studies.

  2. A checklist of the ticks of Malaysia (Acari: Argasidae, Ixodidae), with lists of known associated hosts, geographical distribution, type localities, human infestations and pathogens
    Kazim AR, Houssaini J, Tappe D, Heo CC
    Zootaxa, 2022 Sep 30;5190(4):485-530.
    PMID: 37045359 DOI: 10.11646/zootaxa.5190.4.2
    Studies of ticks in Malaysia from past articles were reviewed, resulting in a list of 47 species belonging to seven genera (Argas, Ornithodoros, Amblyomma, Dermacentor, Haemaphysalis, Ixodes, and Rhipicephalus). The most prevalent genus in Malaysia is Haemaphysalis (20 species), followed by Amblyomma (eight species) and Dermacentor (seven species). Out of 47 species, only 28 have bitten humans, mostly belonging to Haemaphysalis. The most researched tick-borne pathogens in Malaysia are Rickettsia and Anaplasma, and most research was focused on the tropical-lineage brown dog ticks, R. sanguineus sensu lato, and the cattle ticks, Haemaphysalis bispinosa and Rhipicephalus microplus. 18 species were excluded from the list due to lack of definite records or dubious findings: Ornithodoros mimon, O. turicata, Amblyomma breviscutatum, A. clypeolatum, A. integrum, A. maculatum, Dermacentor marginatum, D. taiwanensis, Haemaphysalis birmaniae, H. flava, H. humerosa, H. longicornis, H. punctata, H. sulcata, Ixodes holocyclus, Rhipicephalus appendiculatus, R. annulatus and R. bursa. This paper presents the first complete and updated list for Dermacentor and Ixodes tick species in Malaysia since Kohls (1957).
  3. A new host record of Haemaphysalis semermis (Acari: Ixodidae) from the domestic cat (Felis catus) (Carnivora: Felidae) in Orang Asli village, Pahang National Park Malaysia
    Kazim AR, Shezryna S, Azdayanti M, Houssaini J, Tappe D, Heo CC
    J Med Entomol, 2023 May 12;60(3):615-619.
    PMID: 36933194 DOI: 10.1093/jme/tjad025
    We report the presence of a male Haemaphysalis semermis collected from the domestic cat, Felis catus in an aboriginal village located in Pahang, Malaysia. This paper constitutes a new host record of this tick species, and also the first documentation of the infestation of companion animals other than domestic dogs (Canis lupus) by H. semermis in Malaysia. Additionally, we have included an updated host index of the tick species in Southeast Asia.
  4. Fulltext A new record for Lispe orientalis Wiedemann, 1824 (Diptera: Muscidae) from peninsular Malaysia
    Chew WK, Kurahashi H, Nazni WA, Heo CC, Heah SK, Jeffery J, et al.
    Trop Biomed, 2012 Sep;29(3):489-92.
    PMID: 23018512
    Lispe orientalis Wiedemann, 1824 is recorded for the first time in peninsular Malaysia. Specimens were collected from a mushroom cultivation farm in Genting Highlands, Pahang (3°25'18"N 101°47'48"E). Previously, this species had been recorded from Azerbaijin, India, Russia, Tajikistan, Thailand, Turkey and South Korea. The male of Lispe orientalis can be determined by the following characteristics: body non-metallic, ashy gray, third antennal segment black, R5 cell not narrow apically, hind metatarsus normal, legs entirely black, femora with long bristle-like hairs on av and pv surfaces, hind tibia without av and pv seta and the palpi orangish in colour.
  5. Fulltext A new record of Bengalia emarginata Malloch, 1927 (Diptera: Calliphoridae) from Malaysia
    Heo CC, Kurahashi H, Mohamad AM, Jeffrey J, Dhang CC, Zuha RM, et al.
    Trop Biomed, 2008 Dec;25(3):262-3.
    PMID: 19287369
    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.
  6. Fulltext A new record of Fannia prisca Stein, 1918 (Diptera:Fanniidae) from peninsular Malaysia
    Heo CC, Kurahashi H, Nishida K, Tan Siew H, Mohamed Z, Mohamed AM, et al.
    Trop Biomed, 2008 Dec;25(3):254-6.
    PMID: 19287366
    Fannia prisca Stein, 1918 is newly recorded from peninsular Malaysia. This record is based on 4 male specimens from Mount Berembun, Brinchang, Cameron Highland, Pahang state, peninsular Malaysia. It is previously recorded from China, Mongolia, Korea, Japan, Taiwan, Bonin Island, Thailand and oriental region. The male of Fannia prisca can be differentiated from male Fannia scalaris by the following features: for F. prisca, mid-coxa without spine; mid-tibia normal or without stout triangular ventral projection; and hind tibia usually with 2 av, while F. scalaris has several stout hook-like spines on the anterior margin; mid-tibia with stout triangular ventral projection and hind tibia usually with 3 av. Both F. prisca and F. scalaris can be differentiated from Fannia leucosticta by looking at its hind tibia, which only has 1 av.
  7. Fulltext A preliminary report on ants (Hymenoptera: Formicidae) recovered from forensic entomological studies conducted in different ecological habitats in Malaysia
    Chen CD, Nazni WA, Lee HL, Hashim R, Abdullah NA, Ramli R, et al.
    Trop Biomed, 2014 Jun;31(2):381-6.
    PMID: 25134909 MyJurnal
    This study reported the ant species that were recovered from monkey carcasses in three different ecological habitats in Malaysia. The study was conducted from 9 May - 10 October 2007, 6 May - 6 August 2008 and 26 May - 14 July 2009 in forested area (Gombak, Selangor), coastal area (Tanjong Sepat, Selangor) and highland area (Bukit Cincin, Pahang), respectively. Monkey carcass was used as a model for human decomposition in this study. A total of 4 replicates were used in each of the study sites. Ants were observed to prey on eggs, larvae, pupae and newly emerged flies. This study found that ant species could be found at all stages of decomposition, indicating that ants were not a significant indicator for faunal succession. However, different species of ants were obtained from monkey carcasses placed in different ecological habitats. Cardiocondyla sp. was only found on carcasses placed in the coastal area; while Pheidole longipes, Hypoponera sp. and Pachycondyla sp. were solely found on carcasses placed in the highland area. On the other hand, Pheidologeton diversus and Paratrechina longicornis were found in several ecological habitats. These data suggests that specific ant species can act as geographic indicators for different ecological habitats in forensic entomology cases in Malaysia.
  8. Fulltext A preliminary study of insect succession on a pig carcass in a palm oil plantation in Malaysia
    Heo CC, Mohamad AM, Ahmad Firdaus MS, Jeffery J, Baharudin O
    Trop Biomed, 2007 Dec;24(2):23-7.
    PMID: 18209704 MyJurnal
    This preliminary study was carried out in a palm oil plantation in Tanjung Sepat, Selangor in 17 May 2007 by using pig (Sus scrofa) as a carcass model in forensic entomological research. A 3 month old pig (8.5 kg) that died of pneumonio was placed in the field to observe the decomposition stages and the fauna succession of forensically important flies. Observation was made for two weeks; two visits per day and all climatological data were recorded. The first visitor to the pig carcass was a muscid fly, seen within a minute, and followed by ants and spiders. Within half an hour, calliphorid flies came over. On the second day (fresh), few calliphorid and sarcophagid flies were found on the carcass. Two different species of moths were trapped in the hanging net. The first larva mass occurred on the third day (bloated) around the mouthpart, with some L1 and L2 found in the eyes. Reduvid bugs and Staphylinidae beetles were recovered on the fourth day (active decay), and new maggot masses occurred in the eyes and anus. L3 larvae could be found beneath the pig carcass on the fourth day. On the fifth day (active decay), new maggot masses were found on neck, thorax, and hind legs. Advance decay occurred on the sixth day with abundant maggots covering all over the body. The main adult fly population was Chrysomya megacephala (day 2 to day 6), but the larvae population was mainly those of Chrysomya rufifacies (day 4 to day 14). The dry stage began on the eighth day. Hermetia illucens adult was caught on day-13, and a larvae mass of Chrysomya rufifacies was seen burrowing under the soil. This forensic entomological research using pig carcass model was the first record in this country.
  9. Acari community in association with delayed pig carrion decomposition
    Heo CC, Teel PD, OConnor BM, Tomberlin JK
    Exp Appl Acarol, 2021 Dec;85(2-4):223-246.
    PMID: 34762225 DOI: 10.1007/s10493-021-00676-6
    Acari community structure and function associated with delayed pig carrion decomposition has not been examined. In this study, 18 swine carcasses were studied in central Texas, USA, during two consecutive summers (2013 and 2014). Samples of ca. 400 g soil were collected from beneath, aside, and 5 m away from each pig carcass over 180 days. Mites from soil samples were extracted using Berlese funnels and identified to order and family levels and classified according to ecological function. In total 1565 and 1740 mites were identified from the 2013 and 2014 soil samples, respectively. Significant differences were determined for mite community structure at order and family levels temporally on carrion (e.g., day 0 × day 14) regardless of treatments and between soil regions where mites were collected (e.g., soil beneath vs. soil 5 m away from carrion). However, no significant differences were found in mite community structure at the order level between pig carrion with and without delayed Diptera colonization (i.e., treatments). Analysis at the family level determined a significant difference across treatments for both summers. Ecological function of mites did not change significantly following the delayed decomposition of pig carcasses. However, detritivores and fungivores were significant indicator groups during the pig carrion decomposition process. Furthermore, 13 phoretic mite species associated with eight forensically important beetle species were documented. Data from this study indicated that the rate of nutrient flow into the soil impacted associated arthropod communities; however, detecting such shifts depends on the taxonomic resolution being applied.
  10. Age estimation of forensically important blowfly, Chrysomya megacephala (Diptera: Calliphoridae) pupae using micro-computed tomography imaging
    Nur Aliah NA, Heo CC, Noor Shafini M, Mohd Hafizi M
    Trop Biomed, 2019 Sep 01;36(3):640-653.
    PMID: 33597486
    Accurate estimation of the minimum post-mortem interval (minPMI) is important in the investigation of forensic cases. Various thanatological methods are being used to estimate this interval. However, entomology approach is the most reliable method for this minPMI estimation especially when death has occurred over 72 hours and involved insects or other arthropods evidence at the death scene. The current methods of age estimation are daunting and destructive especially when dealing with pupal stage. The aims of this study were to characterize the morphological changes during intra-puparial period of Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae) and their relation with minPMI estimation by using a high resolution micro-Computed Tomography (micro-CT). Gravid C. megacephala were collected from a rural area in Sungai Buloh, Selangor and cultured in the laboratory at 23.83±0.25°C with light: dark hour of 12:12 to initiate oviposition. The resulting larvae were reared until pupal stage. A pupa was collected at first (24 hours), second (48 hours), third (72 hours), and fourth quarter (96 hours) of the intra-puparial period. The pupal samples were placed directly into 70% ethanol for preservation. Micro-CT scanning was employed to acquire microstructural information following pupal sample staining for contrast enhancement. Eight age-informative internal morphological landmarks were mapped from the micro-CT scanning. The present study enhanced the potential value of micro-CT for the estimation of minPMI based on the internal morphological changes of C. megacephala pupae. This novel method is a promising tool for improving medico-legal investigations in forensic entomology.
  11. An annotated checklist of sucking lice (Phthiraptera: Anoplura) from domestic and wild mammals in Malaysia, with lists of hosts and pathogens
    Kazim AR, Houssaini J, Tappe D, Heo CC
    Zootaxa, 2022 Dec 02;5214(3):301-336.
    PMID: 37044900 DOI: 10.11646/zootaxa.5214.3.1
    Literature records of sucking lice (Phthiraptera: Anoplura) from Malaysia were checked and reviewed, resulting in a list of 34 established species belonging to 11 genera (Ancistroplax, Atopophthirus, Enderleinellus, Haematopinus, Hamophthirius, Hoplopleura, Linognathus, Neohaematopinus, Pedicinus, Polyplax and Sathrax). Furthermore, three local and six cosmopolitan louse species are regarded as dubious in Malaysia, due to misidentifications or lack of locality records. Also, pathogens known to be associated with the sucking lice are listed. The alarming conservation status of some Malaysian mammalian host species and their sucking lice warrant more research and imminent action to preserve the biodiversity of the country. This paper presents the first complete checklist of anopluran lice from both Peninsular Malaysia and Malaysian Borneo, including localities, literature references and a host-louse list.
  12. An annotated checklist of the chewing lice (Phthiraptera: Ischnocera, Amblycera, Rhynchophthirina) from domestic and wild mammals in Malaysia
    Kazim AR, Houssaini J, Tappe D, Heo CC
    Zootaxa, 2023 Apr 04;5263(1):40-60.
    PMID: 37045000 DOI: 10.11646/zootaxa.5263.1.2
    Literature records of chewing lice (Phthiraptera) from mammals in Malaysia were checked and reviewed, resulting in a list of 13 confirmed species belonging to eight genera (Bovicola, Felicola, Gliricola, Gyropus, Haematomyzus, Heterodoxus, Lorisicola, Trichodectes) from four families (Boopiidae, Gyropidae, Haematomyzidae, Trichodectidae) in three suborders (Amblycera, Ischnocera, Rhynchophthirina). We present a checklist of those 13 chewing lice recorded from Peninsular Malaysia and Malaysian Borneo, including hosts, localities, and literature references. An additional 12 species are listed and discussed as possibly occurring in this country. A host-louse list is also given.
  13. Fulltext An observation on the decomposition process of gasoline-ingested monkey carcasses in a secondary forest in Malaysia
    Rumiza AR, Khairul O, Zuha RM, Heo CC
    Trop Biomed, 2010 Dec;27(3):373-83.
    PMID: 21399577
    This study was designed to mimic homicide or suicide cases using gasoline. Six adult long-tailed macaque (Macaca fascicularis), weighing between 2.5 to 4.0 kg, were equally divided into control and test groups. The control group was sacrificed by a lethal dose of phenobarbital intracardiac while test group was force fed with two doses of gasoline LD50 (37.7 ml/kg) after sedation with phenobarbital. All carcasses were then placed in a decomposition site to observe the decomposition and invasion process of cadaveric fauna on the carcasses. A total of five decomposition stages were recognized during this study. This study was performed during July 2007. Fresh stage of control and test carcasses occurred between 0 to 15 and 0 to 39 hours of exposure, respectively. The subsequent decomposition stages also exhibited the similar pattern whereby the decomposition process of control carcasses were faster than tested one. The first larvae were found on control carcasses after 9 hours of death while the test group carcasses had only their first blowfly eggs after 15 hours of exposure. Blow flies, Achoetandrus rufifacies and Chrysomya megacephala were the most dominant invader of both carcasses throughout the decaying process. Diptera collected from control carcasses comprised of scuttle fly, Megaselia scalaris and flesh fly, sarcophagid. We concluded that the presence of gasoline and its odor on the carcass had delayed the arrival of insect to the carcasses, thereby slowing down the decomposition process in the carcass by 6 hours.
  14. Fulltext Ants (Hymenoptera: Formicidae) associated with pig carcasses in Malaysia
    Heo CC, Mohamad AR, Rosli H, Nurul Ashikin A, Chen CD, John J, et al.
    Trop Biomed, 2009 Apr;26(1):106-9.
    PMID: 19696735
    An observational study was conducted in an oil palm plantation in Tanjung Sepat, Selangor, Malaysia on August until September 2007 to note the decomposition process of pigs and their related faunal succession. We collected six species of ants (Formicidae) from 3 subfamilies: Formicinae (Oecophylla smaragdina and Anoplolepis gracilipes), Myrmicinae (Tetramorium sp. and Pheidologeton sp.) and Ponerinae (Odontoponera sp. and Diacamma sp.) that were associated with pig carcasses placed on the ground. Oecophylla smaragdina, Pheidologeton sp. and Tetramorium sp. were found on a partially burnt pig carcass whereas the other species were recovered from unburned pig carcass. These ants predated on fly eggs, larvae, pupae and adults. Ants could be found at all stages of decomposition starting from fresh until dry stage. Predatory ants can reduce fly population and thus may affect the rate of carcass decomposition but this was not seen in our study. Even though O. smaragdina was seen at all stages of decomposition of the burnt pig, this did not alter much the decomposition process by fly larvae.
  15. Applications of drone in disaster management: A scoping review
    Mohd Daud SMS, Mohd Yusof MYP, Heo CC, Khoo LS, Chainchel Singh MK, Mahmood MS, et al.
    Sci Justice, 2022 Jan;62(1):30-42.
    PMID: 35033326 DOI: 10.1016/j.scijus.2021.11.002
    The use of drones has rapidly evolved over the past decade involving a variety of fields ranging from agriculture, commercial and becoming increasingly used in disaster management or humanitarian aid. Unfortunately, the evidence of its use in mass disasters is still unclear and scarce. This article aims to evaluate the current drone feasibility projects and to discuss a number of challenges related to the deployment of drones in mass disasters in the hopes of empowering and inspiring possible future work. This research follows Arksey and O'Malley framework and updated by Joanna Briggs Institute Framework for Scoping Reviews methodology to summarise the results of 52 research papers over the past ten years, from 2009 to 2020, outlining the research trend of drone application in disaster. A literature search was performed in Medline, CINAHL, Scopus, individual journals, grey literature and google search with assessment based on their content and significance. Potential application of drones in disaster are broad. Based on articles identified, drone application in disasters are classified into four categories; (1) mapping or disaster management which has shown the highest contribution, (2) search and rescue, (3) transportation and (4) training. Although there is a significant increase in the number of publications on use of drone in disaster within the last five years, there is however limited discussion to address post-disaster healthcare situation especially with regards to disaster victim identification. It is evident that drone applications need to be further explored; to focus more on drone assistance to humans especially in victim identification. It is envisaged that with sufficient development, the application of drones appears to be promising and will improve their effectiveness especially in disaster management.
  16. Fulltext Autochthonous human schistosomiasis, Malaysia
    Latif B, Heo CC, Razuin R, Shamalaa DV, Tappe D
    Emerg Infect Dis, 2013 Aug;19(8):1340-1.
    PMID: 23876448 DOI: 10.3201/eid1908.121710
  17. Colonization of Rabbit Carcasses by Drain Fly Larvae, Psychoda sp. (Diptera: Psychodidae): The First Report
    Azmiera N, Low VL, Heo CC
    Acta Parasitol, 2021 Jun;66(2):706-709.
    PMID: 33389626 DOI: 10.1007/s11686-020-00313-z
    INTRODUCTION: Psychoda sp. is often collected from patchy habitats such as sewers, drains and decomposing organic matters. The discovery of Psychoda sp. in forensic studies indicated that it might have noteworthy value in assisting death investigations.

    PURPOSE: This study reports on the first finding of Psychoda larvae collected from decomposing rabbit carcasses placed in Cameron Highlands, Pahang, Malaysia.

    METHODS: The larvae were first observed on rabbit carcasses and were collected using tweezers and carefully preserved in 70% ethanol. They were subsequently mounted on microscopy slides using Hoyer's medium and identified as Psychoda sp. morphologically. The identification was also confirmed through a DNA barcoding analysis.

    RESULTS: Psychoda sp. larvae were collected on day-10 post-mortem where the rabbit carcasses were at the advanced decay stage of decomposition. The cytochrome c oxidase I (COI) gene sequences of the larvae had 90% similarity with the Psychoda spp. in the database.

    CONCLUSION: The finding of these larvae on carrion may provide additional valuable insights into forensic entomology and may assist in death investigations.

  18. Commentary on article: Aerobic microbe community and necrophagous insects associated with decomposition of pig carrion poisoned with lead by Aneyo et al. (DOI: https://doi.org/10.1016/j.legalmed.2019.101638)
    Zaini NA, Ivorra T, Azmiera N, Natasha NA, Heo CC
    Leg Med (Tokyo), 2021 02;48:101818.
    PMID: 33271415 DOI: 10.1016/j.legalmed.2020.101818
  19. Fulltext Dermatitis caused by Paederus fuscipes Curtis, 1840 (Coleoptera: Staphilinidae) in student hostels in Selangor, Malaysia
    Heo CC, Latif B, Hafiz WM, Zhou HZ
    Southeast Asian J. Trop. Med. Public Health, 2013 Mar;44(2):197-205.
    PMID: 23691629
    We report a series of dermatitis cases caused by the staphilinid beetles, Paederusfuscipes Curtis, among university students staying in the residential college in Puncak Alam, Selangor, Malaysia from 1 January to 31 December 2010. A total of 360 cases (6.0%) were recorded in the Student Health Center throughout the year; the majority of patients stayed at a hostel near an oil palm plantation. Skin symptoms included erythema, edema, vesicular papules, painful blisters, burning sensation, pruritus, hyper pigmentation and peeling of skin. The commonly involved sites were the face, neck, shoulders and arms. Most students noticed the symptoms upon awakening in the morning. The patients were treated with fusidic acid cream and the symptoms resolved within 5 days. These beetles are nocturnally active and enter the room whenever a light source is available. The unintentional crushing of these beetles during sleep causes the release of its hemolymph (paederin) which is the cause of the dermatitis.
  20. Fulltext Detection of sarcocystosis in goats in Malaysia by light microscopy, histology, and PCR
    Kutty MK, Latif B, Muslim A, Hussaini J, Daher AM, Heo CC, et al.
    Trop Anim Health Prod, 2015 Apr;47(4):751-6.
    PMID: 25740651 DOI: 10.1007/s11250-015-0789-4
    A number of methods have been used for the detection of the presence of microsarcocysts in animals, but little information exists on the value between the various methods. This study therefore examined for Sarcocystis spp. using three different methods in 105 samples of skeletal muscle collected from goats slaughtered in an abattoir in Selangor, Malaysia from January to February 2014. Three methods were used, direct light microscopy of squashed fresh muscle tissues; histological examination of fixed, sectioned, and hematoxylin and eosin (H&E)-stained samples of muscle; and molecular identification by polymerase chain reaction (PCR). Of the 105 tissue samples, 55 (52.38 %) were positive by light microscopy (LM), 46 (43.8 %) by histology, and 95 (90.48 %) by PCR. Only 29 (27.6 %) and 5 (4.76 %) samples were positive and negative, respectively, by all three methods. The cysts were elongated to a spindle shape with a mean size of 393.30 × 81.6 μm and containing banana-shaped bradyzoites of size 12.32 × 2.08 μm. The wall of the cyst was radially striated with a thickness of 2.83 μm. Samples were tested for the presence of Sarcocystis-specific 18S rRNA and were identified as Sarcocystis capracanis. Of the three methods used, the PCR test appears to be the most useful method for the diagnosis of sarcocystosis especially for species identification.
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