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Weisbroth SH. The Use of Rabbits Used to Propagate Human Lice for Research. Comp Med 2024; 74. [PMID: 38449291 PMCID: PMC11267438 DOI: 10.30802/aalas-cm-23-000073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 11/15/2023] [Accepted: 01/15/2024] [Indexed: 03/08/2024]
Abstract
The globally important human diseases of trench fever, epidemic typhus, and relapsing fever are vectored by the human louse Pediculus humanus humanus. Although these conditions are epidemically quiescent at present, they persist in socially dysfunctional situations of war, deprivation, and crowding. The taxonomically closely related head louse, Pediculus humanus capitis, does not respect economic or social status and is quite common in most countries. The 2 types of lice are now recognized as conspecific ecotypes of a single species. While the body louse has been adapted for propagation in the laboratory by feeding in vivo on live rabbits, a similar animal model has not been developed for the host-specific head louse. Accordingly, research for treatment and control of the head louse has largely been performed by using laboratory-reared body lice. This review describes methods for the propagation of body lice in the laboratory and outlines at least 4 areas of research that require sufficient numbers of aged body louse cohorts produced in rabbits for use in controlled studies: 1) pediculicide development and resistance, 2) immunity and vaccine potential, 3) endosymbiotic bacteria needed by lice for nutrition, and 4) lice as vectors of human disease. The review concludes with a discussion of several ethical issues involved with the standard method of using unsedated rabbits and recommends consideration of providing sedating anesthetics for rabbits used in louse feeding procedures.
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Moradi-Asl E, Saghafipour A, Hamta A, Taheri-Kharameh Z, Abazari M, Asghari Jajin S. The effect of educational intervention on efficacy of 1% permethrin shampoo and 4% dimeticone lotion to treat head lice infestation using propensity score matching (PSM). BMC Infect Dis 2024; 24:143. [PMID: 38291370 PMCID: PMC10826169 DOI: 10.1186/s12879-024-09029-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 01/18/2024] [Indexed: 02/01/2024] Open
Abstract
BACKGROUND Head lice are a main public health problem and the most important human ectoparasites and the use of pediculicides is the most common way to control it. One of the possible causes of treatment failure is the lack of improper application of pediculicide. The aim of this study was to assess the effect of education on efficacy of 1% permethrin or 4% dimeticone lotion to treat head lice infestation. METHODS This quasi-experimental study included 100 individuals with head lice infestation from comprehensive urban health centers in Ardabil as the intervention group, and 400 individuals from East Azerbaijan and West Azerbaijan provinces as the control group, from April to March 2019. The data collection tools included a demographic questionnaire and an examination recording sheet, which documented the presence of adult lice or nits. Due to the inability to perform random assignment and control for numerous observed covariates, propensity score matching (PSM) was used. RESULTS The outcome of treatment included elimination of head lice infestation on is 7, and in the case of recurrence, it was considered on days 14 and 30 after treatment. The results showed that the educational intervention program had a significant positive effect on the efficacy of both treatments. The likelihood of improvement was approximately three times greater in the intervention group compared to the control group. CONCLUSION Participants who received the training intervention (OR = 3.29; CI 95%: 2.21-4.88) were more likely to have a successful treatment than control group. In the case of providing proper training on the use of pediculicides and observing hygiene tips to patients with pediculosis, could help to successful treatment of pediculosis.
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Affiliation(s)
- Eslam Moradi-Asl
- Arthropod-Borne Diseases Research Center , Ardabil University of Medical Sciences, Ardabil, Iran.
- Department of Public Health, School of Public Health, Ardabil University of Medical Sciences, Ardabil, Iran.
| | - Abedin Saghafipour
- Arthropod-Borne Diseases Research Center , Ardabil University of Medical Sciences, Ardabil, Iran
- Department of Public Health, Faculty of Health, Qom University of Medical Sciences, Qom, Iran
| | - Amir Hamta
- Department of Family and Community Medicine, School of Medicine, Qom University of Medical Sciences, Qom, Iran
| | - Zahra Taheri-Kharameh
- Spiritual Health Center, Department of public Health, School of Health, Qom University of Medical Sciences, Qom, Iran
| | - Malek Abazari
- Arthropod-Borne Diseases Research Center , Ardabil University of Medical Sciences, Ardabil, Iran
| | - Shabnam Asghari Jajin
- Department of Medical Entomology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
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The Efficacy and Biopharmaceutical Properties of a Fixed-Dose Combination of Disulfiram and Benzyl Benzoate. Int J Mol Sci 2022; 23:ijms231810969. [PMID: 36142878 PMCID: PMC9502479 DOI: 10.3390/ijms231810969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/23/2022] [Accepted: 09/15/2022] [Indexed: 11/17/2022] Open
Abstract
Scabies and hair lice are parasitic diseases that affect human skin and hair, respectively. The incidence and resistances of these infections are increasing. Tenutex® (disulfiram and benzyl benzoate emulsion) is an alternative to standard insecticides to avoid resistances. The aim of the work is to evaluate the transdermal absorption and the in vitro efficacy against scabies and hair lice after different exposition times. Dermatomed human skin was used to assess the dermal absorption using a validated High Performance Liquid Chromatography (HPLC) method. HEK001 keratinocytes were used to evaluate the cytotoxicity of benzyl benzoate. Only benzyl benzoate was able to cross the skin, but it did not show cytotoxicity at any of the tested concentrations. The product efficacy was tested on Psoroptes ovis after direct contact and after administration on sheep skin explants at different contact times. Permethrin/malathion-resistant strains of Pediculus humanis capitis adults and eggs were directly exposed to Tenutex, and the vitality and hatchability, respectively, were evaluated. The anti-scabies study demonstrated that exposure for 6 or 24 h completely eradicated the parasite. The pediculicidal activity of Tenutex exhibited superior efficacy than standard treatment on resistant lice. The positive results obtained suggest that Tenutex® is a good treatment option, especially in drug resistance situations.
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Subahar R, Susanto L, Aidilla R, Aulia AP, Yulhasri Y, Winita R, Lubis NS, Sari IP. In vitro experiments of Pediculus humanus capitis ( Phthiraptera: Pediculidae) resistance to permethrin and 6-paradol in East Jakarta: Detoxification enzyme activity and electron microscopic changes in lice. Vet World 2021; 14:3065-3075. [PMID: 35017857 PMCID: PMC8743776 DOI: 10.14202/vetworld.2021.3065-3075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 10/20/2021] [Indexed: 01/16/2023] Open
Abstract
Background and Aim: Pediculus humanus capitis, the human head louse, remains a global health problem. This study evaluated the resistance of head lice to permethrin and 6-paradol mediated by in vitro detoxification enzyme activity experiments and to describe physical changes in the lice using scanning electron microscopy (SEM). Materials and Methods: The adult stages of P. h. capitis were collected from patients exposed to 1% permethrin and three different concentrations of 6-paradol (0.00005%, 0.0001%, and 0.00015%) using a filter paper diffusion bioassay. Healthy P. h. capitis adults served as the control. The in vitro bioassays were conducted after 10, 20, 30, and 60 min of exposure. The activities of acetylcholinesterase (AChE), glutathione S-transferase (GST), and oxidase were analyzed. Physical changes in the lice were analyzed using SEM. Results: Permethrin and 6-paradol exhibited low toxicity against the lice. At 60 min, 1% permethrin had killed 36.7% of the lice present, while 6-paradol had killed 66.7-86.7%. Permethrin induced significantly elevated AChE, GST, and oxidase activity; 6-paradol also caused significantly elevated AChE, GST, and oxidase activity. Permethrin did not cause any ultrastructural morphological changes on the lice, while 6-paradol severely damaged the head, thorax, respiratory spiracles, and abdomen of the dead lice. Conclusion: This in vitro experimental of P. h. capitis is the first study to report P. h. capitis in East Jakarta shows complete resistance to permethrin and 6-paradol, and to describe the associated increase in AChE, GST, and oxidase activity. It was observed that 6-paradol severely damaged the head, thorax, respiratory spiracles, and abdomen of the dead lice.
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Affiliation(s)
- Rizal Subahar
- Department of Parasitology, Faculty of Medicine, University of Indonesia, Jl. Salemba 6, Jakarta 10430, Indonesia
| | - Lisawati Susanto
- Department of Parasitology, Faculty of Medicine, University of Indonesia, Jl. Salemba 6, Jakarta 10430, Indonesia
| | - Rachmanin Aidilla
- Medical Doctor Program, Faculty of Medicine, University of Indonesia, Jl. Salemba 4, Jakarta 10430, Indonesia
| | - Annisa Putri Aulia
- Medical Doctor Program, Faculty of Medicine, University of Indonesia, Jl. Salemba 4, Jakarta 10430, Indonesia
| | - Yulhasri Yulhasri
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Indonesia, Jln. Salemba Raya 4, Jakarta 10430, Indonesia
| | - Rawina Winita
- Department of Parasitology, Faculty of Medicine, University of Indonesia, Jl. Salemba 6, Jakarta 10430, Indonesia
| | - Nadar S Lubis
- Department of Parasitology, Faculty of Medicine, University of Indonesia, Jl. Salemba 6, Jakarta 10430, Indonesia
| | - Ika Puspa Sari
- Department of Parasitology, Faculty of Medicine, University of Indonesia, Jl. Salemba 6, Jakarta 10430, Indonesia
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Ogbuefi N, Kenner-Bell B. Common pediatric infestations: update on diagnosis and treatment of scabies, head lice, and bed bugs. Curr Opin Pediatr 2021; 33:410-415. [PMID: 34074914 DOI: 10.1097/mop.0000000000001031] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF THE REVIEW This review will update pediatric providers on the recent data regarding the epidemiology, diagnosis, and treatment of common skin infestations affecting children and adolescents. RECENT FINDINGS Standard superficial skin biopsy for scabies and the vacuum method for head lice can increase diagnostic accuracy and efficiency. There is growing resistance to some of the traditional treatments for scabies and head lice, and progress has been made in finding newer and potentially more effective treatments, such as oral moxidectin for scabies and abametapir for head lice. Recent studies have established the safety of traditional treatments, such as permethrin and oral ivermectin in infants and small children. SUMMARY Permethrin and ivermectin are both considered safe and effective for children and adolescents with scabies. Permethrin is generally considered safe in infants less than two months of age. Proper application of permethrin is critical, and providers should emphasize proper application technique. Treatment of head lice should only be initiated with active infestations. Resistance to permethrin continues to increase and other options are now available, including an over-the-counter topical ivermectin formulation. Identification and eradication of bed bug infestations are crucial in preventing bedbug bites.
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Affiliation(s)
| | - Brandi Kenner-Bell
- Division of Dermatology, Ann and Robert H. Lurie Children's Hospital of Chicago
- Department of Dermatology and Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
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Abrha S, Heukelbach J, Peterson GM, Christenson JK, Carroll S, Kosari S, Bartholomeus A, Feldmeier H, Thomas J. Clinical interventions for tungiasis (sand flea disease): a systematic review. THE LANCET. INFECTIOUS DISEASES 2021; 21:e234-e245. [PMID: 34237261 DOI: 10.1016/s1473-3099(20)30853-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 10/14/2020] [Accepted: 10/21/2020] [Indexed: 12/30/2022]
Abstract
Tungiasis (sand flea disease) is an epidermal parasitic skin disease occurring in resource-limited communities. There is no standard treatment for tungiasis, and available treatment options are scarce. To our knowledge, this is the first systematic review aimed to assess randomised controlled trials (RCTs) investigating interventions for tungiasis. We systematically searched databases including MEDLINE (EBSCOhost), CENTRAL, CINAHL, PubMed, Web of Science, SciELO, LILACS and Embase (Scopus) for RCTs in any language, from inception of the databases until June 12, 2021. RCTs exploring preventive and therapeutic interventions for tungiasis were eligible. We used the revised Cochrane Collaboration's risk of bias tool to assess the risk of bias and Jadad scale to quantify the methodological quality of the RCTs. Of the 1839 identified records, only eight RCTs involving 808 participants were included, and several methodological deficiencies were identified in most of the trials. Trial interventions included: oral drugs niridazole and ivermectin and topical interventions of ivermectin lotion, metrifonate lotion, thiabendazole lotion, thiabendazole ointment, dimeticones (NYDA), and a neem seed and coconut oils-based mixture for treatment and coconut oil-based lotion (Zanzarin) for prevention. The coconut oil-based lotion for prevention and dimeticones for treatment of tungiasis have displayed the most promise. Most of the RCTs included in this study had low methodological quality. There is a clear unmet need for high-quality RCTs examining safe and effective prevention and treatment alternatives of tungiasis in endemic settings.
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Affiliation(s)
- Solomon Abrha
- Faculty of Health, University of Canberra, Bruce, Canberra, ACT, Australia; Department of Pharmaceutics, School of Pharmacy, College of Health Sciences, Mekelle University, Mekelle, Ethiopia
| | - Jorg Heukelbach
- Postgraduate Program of Public Health, School of Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - Gregory M Peterson
- Faculty of Health, University of Canberra, Bruce, Canberra, ACT, Australia; College of Health and Medicine, University of Tasmania, Hobart, TAS, Australia
| | | | | | - Sam Kosari
- Faculty of Health, University of Canberra, Bruce, Canberra, ACT, Australia
| | - Andrew Bartholomeus
- Faculty of Health, University of Canberra, Bruce, Canberra, ACT, Australia; Daimantina Institute, University of Queensland, Wolloongabba, QLD, Australia
| | - Hermann Feldmeier
- Institute of Microbiology and Infection Immunology, Campus Benjamin Franklin, Charité University Medicine, Berlin, Germany
| | - Jackson Thomas
- Faculty of Health, University of Canberra, Bruce, Canberra, ACT, Australia.
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Effectiveness and tolerability of a squalane and dimethicone-based treatment for head lice. Parasitol Res 2021; 120:1883-1890. [PMID: 33797611 PMCID: PMC8084834 DOI: 10.1007/s00436-021-07113-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 02/28/2021] [Indexed: 11/17/2022]
Abstract
Head lice (Pediculus humanus capitis) are worldwide obligate human ectoparasites, with high implications in pediatrics. In Europe, first-line topical neurotoxic insecticidal therapeutic strategies are being replaced by topical physically acting agents as the first-choice treatment. Safety of the active ingredients and high efficacy in a one-time single-dose treatment with a brief treatment application time are key issues for consumer use and effective compliance. The aim of this study was to assess the in vitro efficacy of a newly developed squalane and dimethicone-based pediculicidal formula, against motile head lice and eggs after 2 and 5 min immersion in the product, as well as its skin tolerance and acceptability under dermatological and pediatric expert control in children with atopic skin. The results indicate that at both time points, 100% mortality rate of head lice crawling stages and late-stage eggs was achieved. The formula was well tolerated and suitable for children with atopic skin from 12 months of age. Showing high in vitro efficacy and good skin acceptability, this solution is presented as a new safe alternative therapy for treatment of head lice infestations.
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Fölster-Holst R. [Parasitoses in childhood]. Hautarzt 2021; 72:232-242. [PMID: 33599802 DOI: 10.1007/s00105-021-04767-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/19/2021] [Indexed: 11/26/2022]
Abstract
Parasitoses are a frequent occurrence in pediatric consultations in both hospitals and private practices. Responsible for this are parasites that permanently infest human skin, such as Sarcoptes scabiei hominis and Pediculus humanus capitis (persistent parasites) as well as those that only attack the skin for feeding, such as Pulex irritans, Cimex lectularius und Neotrombicula autumnalis (transient parasites). The main symptom of parasitoses is pruritus, which is caused by a delayed allergic reaction to proteins in the saliva of the parasites. In some parasitoses, such as scabies, the pruritus is typical, occurs particularly at night and is associated with a considerable impairment in the quality of life due to the resulting lack of sleep, whereas the pruritus is often absent in the case of pediculosis capitis. In this article persistent and transient parasitoses are characterized based on the patient history, morphology and symptoms.
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Affiliation(s)
- R Fölster-Holst
- Dermatologie, Venerologie, Allergologie, UKSH, Campus Kiel, Rosalind-Franklin-Str. 7, 24105, Kiel, Deutschland.
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