1
|
Chiriac A, Diaconeasa A, Miulescu R, Chiriac AE, Wollina U. Scabies in infants and children - a narrative review. Eur J Pediatr 2024; 183:2527-2536. [PMID: 38536458 DOI: 10.1007/s00431-024-05535-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 04/21/2024]
Abstract
Scabies is a human ectoparasitosis caused by Sarcoptes scabei var. hominis. World-wide around 300 million patients are affected. Infants and children have the highest incidence rates. Poverty and overcrowding are social factors contributing to a higher risk of transmission and treatment failure. The leading symptom of the infestation is itch. Complications are bacterial infections that are responsible for mortality. Diagnosis is clinical. Non-invasive imaging technologies like dermoscopy can be used. Polymerase chain reaction (PCR) is less sensitive and specific than microscopy of skin scrapings. Treatment of choice is topical permethrin 5%. Ivermectin is the only oral drug FDA-approved for scabies. It should be used in cases non-responsive to topical therapy and in case of high number of infested patients in addition to topical therapy. Pseudo-resistance to treatment is not uncommon. New drugs are on the horizon. What is Known: • Pruritus is the leading symptom causing sleep disturbances and scratching with the risk of secondary bacterial infections. • Treatment failure is related to inappropriate application of topical drugs and asymptomatic family members. What is New: • COVID-19 pandemic and migration are contributing to an increased incidence of scabies. • New compounds to treat scabies are on the horizon.
Collapse
Affiliation(s)
- Anca Chiriac
- Department of Dermatology, Nicolina Medical Center, Iasi, Romania
- Apollonia University, Iasi, Romania
- Romanian Academy, P. Poni Institute of Macromolecular Chemistry, Iasi, Romania
| | - Adriana Diaconeasa
- Dermatology Ambulatory Care Center, "Grigore Alexandrescu" Clinical Emergency Hospital for Children, Bucharest, Romania
| | | | - Anca E Chiriac
- Department of Dermatology, Nicolina Medical Center, Iasi, Romania
- Grigore T Popa University of Medicine and Pharmacy, Iasi, Romania
| | - Uwe Wollina
- Department of Dermatology and Allergology, Städtisches Klinikum Dresden, Academic Teaching Hospital of the Technical University of Dresden, Friedrichstrasse 41, 01067, Dresden, Germany.
| |
Collapse
|
2
|
Gu XB, Zhou Y, Hao GY, Wang Y, Yang FS, Huang CR, Tian Y, Xie Y, He R, Xu J. Development of the first PCR for detection of Psoroptes ovis var. cuniculi infection and its comparison to microscopic examination and serological assay in rabbits. Vet Parasitol 2023; 320:109979. [PMID: 37393884 DOI: 10.1016/j.vetpar.2023.109979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/21/2023] [Accepted: 06/22/2023] [Indexed: 07/04/2023]
Abstract
Psoroptes mites are the common ecto-parasites of wild and domestic animals worldwide, which causes considerable economic losses in livestock industry. Microscopy is deemed to be the 'gold standard' for the diagnosis of Psoroptes mite infection but it has poor sensitivity for low mite infections and/or sub-clinical infections. To overcome these shortcomings, we screened four genes to develop a sensitive and specific PCR for the detection of Psoroptes mite infection in rabbits, and confirmed its practicability in detecting early infection and monitoring treatment outcome with traditional microscopy and serological tests. Results showed that PCR assay targeting ITS2 (ITS2-PCR) had a high specificity and sensitivity (detection limit: 40.3 pg/μL DNA) for detecting P. ovis DNA. In rabbits artificially infected with P. ovis, all three diagnostic tests showed the same detection rate from 14 days post infection (dpi) to 42 days dpi. However, these diagnostic tests behave differently at 7 dpi and after treatment: at 7 dpi, the detection rate of ITS2-PCR was higher than rPsoSP3-based iELISA and traditional microscopy (ITS2-PCR: 88.9%, rPsoSP3-iELISA: 77.7%, microscopy: 33.3%); at 7 days post treatment (dpt), positivity rates of ITS2-PCR and microscopy rapidly decreased to 0.00% and 11.1%, whereas rPsoSP3-iELISA remained 100% positive rate. Furthermore, the comprehensive comparisons of diagnostic performance and features of three diagnostic tests at 7 dpi were performed. Compared to ITS2-PCR or rPsoSP3-iELISA, microscopy had the lowest sensitivity, and the agreement between these assays was low (κ < 0.3). Field study showed that ITS2-PCR showed a higher detection rate than microscopy (19.4% and 11.1%, respectively). Our results suggested that the ITS2-PCR developed in this study provided a new laboratory tool for diagnosis of P. ovis var. cuniculi infection, and it had advantages over microscopic examination in detection low-level mite infections and serological assay in monitoring treatment outcome.
Collapse
Affiliation(s)
- X B Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China.
| | - Y Zhou
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - G Y Hao
- School of Animal Science, Xichang College, Xichang 615013, China
| | - Y Wang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - F S Yang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - C R Huang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - Y Tian
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - Y Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - R He
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - J Xu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China.
| |
Collapse
|
3
|
Shoukat Q, Rizvi A, Wahood W, Coetzee S, Wrench A. Sight the Mite: A Meta-Analysis on the Diagnosis of Scabies. Cureus 2023; 15:e34390. [PMID: 36874720 PMCID: PMC9976840 DOI: 10.7759/cureus.34390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 01/30/2023] [Indexed: 02/01/2023] Open
Abstract
This meta-analysis was performed to assess the efficacy of the diagnostic tests for scabies infections that are currently in wide use. Scabies is most commonly diagnosed through clinical presentations; however, due to the wide array of symptoms, diagnosis is difficult. The most commonly used diagnostic test is skin scraping. However, this test relies on correctly selecting the site of mite infection for sampling. Due to the mobile nature of a live parasitic infection, the mite can often be missed based on its current location within the skin. The goal of this paper is to determine if a gold standard confirmatory test exists for the diagnosis of scabies by comparing Skin Scraping, Adhesive Tape, Dermoscopy, and PCR tests. Medline, PubMed, and Neglected Tropical Diseases databases were utilized in a literature review. Eligible papers were papers published in or after the year 2000, published in the English language, and mainly focused on the diagnosis of scabies. At the time of this meta-analysis, scabies is mostly diagnosed through a correlation of clinical symptoms in conjunction with diagnostic tests such as dermoscopy (sensitivity: 43.47%, specificity: 84.41%), adhesive tape tests (sensitivity: 69.56%, specificity: 100%) and PCR antigen detection (37.9% sensitivity, specificity: 100%). Due to a scarcity of data in the literature, the diagnostic efficacy of other diagnostic tests is difficult to assess. Overall, the efficacies of the tests analyzed vary depending on how similar scabies is to other skin disorders, how challenging it is to get a usable sample and the price and accessibility of essential tools. There is a need for standardized national diagnostic criteria to increase the diagnostic sensitivity of scabies infection.
Collapse
Affiliation(s)
- Qaas Shoukat
- College of Medicine, Dr. Kiran C. Patel College of Allopathic Medicine, Nova Southeastern University, Davie, USA
| | - Ahraz Rizvi
- College of Medicine, Dr. Kiran C. Patel College of Allopathic Medicine, Nova Southeastern University, Davie, USA
| | - Waseem Wahood
- College of Medicine, Dr. Kiran C. Patel College of Allopathic Medicine, Nova Southeastern University, Davie, USA
| | - Skyler Coetzee
- Medicine, Dr. Kiran C. Patel College of Allopathic Medicine, Nova Southeastern University, Davie, USA
| | - Algevis Wrench
- Microbiology, Nova Southeastern University, Fort Lauderdale, USA
| |
Collapse
|
4
|
Prevalence, hematological, serum biochemical, histopathology, and molecular characterization of Sarcoptes scabiei in naturally infected rabbits from Minoufiya Governorate, Egypt. Vet Parasitol Reg Stud Reports 2022; 36:100788. [PMID: 36436899 DOI: 10.1016/j.vprsr.2022.100788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 09/07/2022] [Accepted: 09/27/2022] [Indexed: 01/14/2023]
Abstract
Sarcoptic mange is a highly contagious ectoparasitic disease that causes significant economic losses in the rabbit industry. The current study intended to reveal the infection rate, histopathology, and genetic characterization of Sarcoptes scabiei (S. scabiei) in naturally infected rabbits in Minoufiya governorate, Egypt. A total of 1120 rabbits were physically inspected for sarcoptic mange lesions and infections were confirmed microscopically. In addition, the various hematologic and serum biochemical parameters in naturally infected and non-infected rabbits were evaluated. A histopathological examination was performed. Genomic DNA was isolated from skin scraping samples and amplified using PCR primers targeting the ITS-2 region and Cox1 and Actin genes, which were then sequenced and phylogenetically analyzed. The overall prevalence of S. scabiei was 5.98%. Although the infection was higher in females than males, the analysis showed no statistically significant difference. White blood cells, lymphocytes, liver enzymes (GOT and GPT), urea, total antioxidant capacity, glutathione peroxidase, and malondialdehyde dramatically increased whereas RBCs, Hb, and MCV significantly decreased. There were epidermal thickening and hyperkeratosis, inflammation, and homogenous faint pink edematous lesions, and the S. scabiei was attached to the stratum corneum and/or burrowing through it, causing tunnels. PCR and sequence analysis of the ITS-2 region and Cox1 and Actin genes showed that the sequences in the present study were highly identical to the homologous sequences from several countries and confirmed that the mite was S. scabiei. This study presented the first molecular characterization of S. scabiei in rabbits from Minoufiya Governorate, Egypt.
Collapse
|
5
|
Campbell M, van der Linden N, Gardner K, Dickinson H, Agostino J, Dowden M, O’Meara I, Scolyer M, Woerle H, Viney R, van Gool K. Health care cost of crusted scabies in Aboriginal communities in the Northern Territory, Australia. PLoS Negl Trop Dis 2022; 16:e0010288. [PMID: 35344551 PMCID: PMC8989313 DOI: 10.1371/journal.pntd.0010288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 04/07/2022] [Accepted: 02/28/2022] [Indexed: 11/27/2022] Open
Abstract
Background Crusted scabies is a debilitating dermatological condition. Although still relatively rare in the urban areas of Australia, rates of crusted scabies in remote Aboriginal communities in the Northern Territory (NT) are reported to be among the highest in the world. Objective To estimate the health system costs associated with diagnosing, treating and managing crusted scabies. Methods A disease pathway model was developed to identify the major phases of managing crusted scabies. In recognition of the higher resource use required to treat more severe cases, the pathway differentiates between crusted scabies severity grades. The disease pathway model was populated with data from a clinical audit of 42 crusted scabies patients diagnosed in the Top-End of Australia’s Northern Territory between July 1, 2016 and May 1, 2018. These data were combined with standard Australian unit costs to calculate the expected costs per patient over a 12-month period, as well as the overall population cost for treating crusted scabies. Findings The expected health care cost per patient diagnosed with crusted scabies is $35,418 Australian dollars (AUD) (95% CI: $27,000 to $43,800), resulting in an overall cost of $1,558,392AUD (95% CI: $1,188,000 to $1,927,200) for managing all patients diagnosed in the Northern Territory in a given year (2018). By far, the biggest component of the health care costs falls on the hospital system. Discussion This is the first cost-of-illness analysis for treating crusted scabies. Such analysis will be of value to policy makers and researchers by informing future evaluations of crusted scabies prevention programs and resource allocation decisions. Further research is needed on the wider costs of crusted scabies including non-financial impacts such as the loss in quality of life as well as the burden of care and loss of well-being for patients, families and communities. Crusted scabies is characterised by thick skin crusting and fissuring and can lead to serious secondary infections and death from complications. Rates of crusted scabies in remote Aboriginal communities in the Northern Territory (NT) are among the highest in the world. Efforts are on the way in Australia to prevent, if not eliminate, crusted scabies. We use data from a clinical audit of 42 patients diagnosed with crusted scabies in the Top-End of the NT to estimate the health system costs associated with diagnosing, treating and managing crusted scabies for patients and their households. This cost of illness study can provide a valuable starting point for policy makers and evaluators in estimating the potential economic impact of crusted scabies prevention programs on health care service use and costs.
Collapse
Affiliation(s)
- Margaret Campbell
- Centre for Health Economics Research and Evaluation, Faculty of Health, University of Technology Sydney, Sydney, Australia
| | - Naomi van der Linden
- Department of Health Technology and Services Research, Technical Medical Centre, University of Twente, Enschede, the Netherlands
| | - Karen Gardner
- Public Service Research Group, School of Business, UNSW Canberra, Canberra, Australia
| | - Helen Dickinson
- Public Service Research Group, School of Business, UNSW Canberra, Canberra, Australia
| | - Jason Agostino
- Academic Unit of General Practice, Australian National University, Canberra, Australia
| | | | | | | | | | - Rosalie Viney
- Centre for Health Economics Research and Evaluation, Faculty of Health, University of Technology Sydney, Sydney, Australia
| | - Kees van Gool
- Centre for Health Economics Research and Evaluation, Faculty of Health, University of Technology Sydney, Sydney, Australia
- * E-mail:
| |
Collapse
|
6
|
Nasution AA, Putra IB, Sari MI. Identification of Sarcoptes scabiei by Clinical Examination and Follow-up Examination in Medan City, Indonesia. Open Access Maced J Med Sci 2021. [DOI: 10.3889/oamjms.2021.7692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Background: Scabies is a disease caused by the mite Sarcoptes scabiei var. hominis. In Indonesia, scabies ranks third out of the 12 most common skin diseases. In terms of disease screening, direct visualization of dermatitis from mites and microscopy of skin scrapings is less sensitive. PCR and dermoscopy examinations have a high sensitivity value to Sarcoptes mites.
Aims: This study aims to identify Sarcoptes scabiei mites between clinical symptoms and supporting examinations, namely PCR and dermoscopy methods.
Methods: This research is a cross-sectional study, with descriptive analytics. The number of samples of 50 people who met the inclusion criteria was examined by microscopic examination, dermoscopy, and PCR. We state it to be positive if we found scabies mites or their eggs on microscopy, delta wing sign, or jet wet contrail on dermoscopy and there is a 135bp DNA band on PCR.
Results: 50 samples diagnosed with scabies based on cardinal sign of scabies, gender were 80% male and 20% female with an average age of 14 years. Based on the location of the rash, the most rashes were between the fingers and toes, each 26% and the least on the head as much as 2%. Based examination tools, no Sarcoptes scabiei mites were found through microscopic and dermoscopic examination, while the PCR examination found 12 positive samples of scabies.
Conclusion: PCR examination is very sensitive and specific even in very small quantities, with the fore primer SSUDF and the reverse primer SSUDR. Further research is needed to assess the sensitivity and specificity of dermoscopy and PCR in diagnosing scabies.
Collapse
|
7
|
Dermoscopy, light microscopy, and real-time polymerase chain reaction for the diagnosis of scabies. Preliminary results. Postepy Dermatol Alergol 2021; 38:578-584. [PMID: 34658697 PMCID: PMC8501433 DOI: 10.5114/ada.2020.94275] [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: 02/05/2020] [Accepted: 02/25/2020] [Indexed: 12/02/2022] Open
Abstract
Introduction Scabies is a widespread, contagious parasitic disease causing intense itching. Its detection is a significant problem while there are no internationally agreed standards. Aim To compare diagnostic methods: microscopy of skin scrapings, dermoscopy, and real-time polymerase chain reaction (PCR) of skin scrapings and wet skin swabs. Material and methods We included patients with clinical signs of scabies. After dermoscopic evaluation, scrapings were collected from skin lesions and assessed by light microscopy and real-time PCR. Wet skin swabs were also analysed by real-time PCR. Surveys on the presence and severity of pruritus and skin lesions were collected. Seventy-five skin scrapings and 41 wet swabs were examined by real-time PCR. Fifty-three patients completed the survey. All patients underwent dermoscopy and microscopy examinations. 6.67% were positive by microscopy, 10.7% by dermoscopy, 28.0% by real-time PCR from scrapings, and 36.6% when both scrapings and swabs were examined by real-time PCR. All microscopy-positive results were also positive by PCR. Results There was a correlation between real-time PCR from positive scrapings and pruritus (p = 0.023) and body surface area of lesions (p = 0.002), a correlation between copies from wet skin swabs and BSA of lesions (p = 0.002) in the whole group, and a correlation between copies of S. scabiei from scrapings and age (p = 0.038). Conclusions Real-time PCR testing of scrapings and dermoscopy are more effective than microscopy. Combined real-time PCR testing of scrapings and skin swabs seemed the most effective. Clinical signs alone should not be used as unambiguous criteria.
Collapse
|
8
|
Yang SY, Kim SS, Kim CW. Effectiveness of Cytochrome c Oxidase Subunit 1 Gene Nested Polymerase Chain Reaction Compared to Dermoscopy or Microscopy Alone for the Detection and Diagnosis of Sarcoptes scabiei var. hominis Infection. Ann Dermatol 2021; 33:419-424. [PMID: 34616122 PMCID: PMC8460474 DOI: 10.5021/ad.2021.33.5.419] [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: 09/14/2020] [Revised: 01/05/2021] [Accepted: 02/01/2021] [Indexed: 11/08/2022] Open
Abstract
Background Background: While microscopy (MS) evaluation of skin scrapings has a 100% positive predictive value and specificity by definition for scabies diagnosis, it has low sensitivity. Dermoscopy (DS) has not yet been widely accepted for diagnosis, and long-term clinician training is required. Objective To evaluate the diagnostic validity of cytochrome c oxidase subunit 1 (cox1) gene nested polymerase chain reaction (PCR) as an adjunctive method for diagnosing scabies. Methods This was a prospective, single institution study, conducted on a total of 302 skin lesions from 50 patients suspected of scabies at Kangdong Sacred Heart Hospital in Seoul, Korea. DS, MS, and cox1 nested PCR were performed on all patients. Results Of the 302 lesions, 145 (48.0%) were obtained at first visit and 157 (52.0%) were identified in the course of follow-up visits after treatment. For all lesions, DS and MS sensitivity levels were 55.9% (73/136) and 55.2% (75/136), respectively, with cox1 gene nested PCR considered as 100%. The results of DS and MS identification showed no difference between each other and showed significant difference from that of cox1 gene nested PCR. Conclusion Nested PCR detecting cox1 may be prospectively used to comprehensively diagnose lesions of scabies in clinical practice.
Collapse
Affiliation(s)
- Si Young Yang
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Sang Seok Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Chul Woo Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| |
Collapse
|
9
|
Talaga-Ćwiertnia K. Sarcoptes Infestation. What Is Already Known, and What Is New about Scabies at the Beginning of the Third Decade of the 21st Century? Pathogens 2021; 10:868. [PMID: 34358018 PMCID: PMC8308645 DOI: 10.3390/pathogens10070868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 07/05/2021] [Accepted: 07/05/2021] [Indexed: 11/28/2022] Open
Abstract
Currently, there are three known subtypes of scabies: ordinary, crusted, and bullous. The worldwide prevalence of scabies remains high in the 21st century. To decrease the social, economic, and psychological impact on the enormous population infected, a lot of important work has been completed over the last 20 years concerning the management of scabies. For example, a standardization of guidelines for the treatment of scabies has been completed and programs have been designed for the prevention and treatment in endemic populations, called mass drug administrations. Unfortunately, these only apply to the ordinary form of scabies. Moreover, resistance to the drugs currently used in treatment is growing, which imposes the need to search for new treatments. For this purpose, new acaricides are being developed to enhance the therapeutic options for the patients' benefit and effectively treat this disease. There is also the necessity for prevention before the development of scabies. An effective vaccine has the potential to protect people before this disease, especially in endemic areas. Unfortunately, there are no such vaccines against Sarcoptes yet.
Collapse
Affiliation(s)
- Katarzyna Talaga-Ćwiertnia
- Jagiellonian University Medical College, Faculty of Medicine, Chair of Microbiology, Department of Infection Control and Mycology, 31-008 Kraków, Poland
| |
Collapse
|
10
|
Lastuti NDR, Rusdiana N, Hastutiek P. Second internal transcribed spacer (ITS-2) as genetic marker for molecular characterization of Sarcoptes scabiei in rabbits from several areas of East Java, Indonesia. J Basic Clin Physiol Pharmacol 2021; 32:701-705. [PMID: 34214345 DOI: 10.1515/jbcpp-2020-0467] [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] [Received: 11/29/2020] [Accepted: 02/05/2021] [Indexed: 11/15/2022]
Abstract
OBJECTIVES The purpose of this study is to use the second internal transcribed spacer (ITS-2) to determine the molecular characteristics of Sarcoptes scabiei in rabbits from several areas of East Java. METHODS Collecting S. scabiei mites from rabbits with clinical signs of scabies; DNA extraction with minikit QIAamp DNA; polymerase chain reaction amplification; nucleotide sequence analysis; homology and phylogenetic tree using the Neighbor-Joining method in the program molecular evolutionary genetics analysis-7 (MEGA-7). RESULTS Sequence analysis of ITS-2 S. scabiei from five regions in East Java showed an identity >91.23% with isolates from China (KX695125.1). The phylogenetic analysis of ITS-2 S. scabiei from Mojokerto rabbits has a close relationship with AB82977.1; Surabaya and Nganjuk rabbits are closely related to KX695125.1; while Sidoarjo and Pasuruan rabbits are closely related to EF514469.2. and AB369384.1. CONCLUSIONS The homology analysis of all samples showed identity of more than 91.23% with isolate China (KX695125.1). The sequences of ITS-2 gen of S. scabiei from rabbits in several areas were relatively close to S. scabiei obtain various hosts from National Centre for Biotechnology Information (NCBI) data.
Collapse
Affiliation(s)
- Nunuk Dyah Retno Lastuti
- Department of Veterinary Parasitology, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Nur Rusdiana
- Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Poedji Hastutiek
- Department of Veterinary Parasitology, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| |
Collapse
|
11
|
Siddig EE, Hay R. Laboratory-based diagnosis of scabies: a review of the current status. Trans R Soc Trop Med Hyg 2021; 116:4-9. [PMID: 33763705 PMCID: PMC8776561 DOI: 10.1093/trstmh/trab049] [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: 01/22/2021] [Revised: 02/28/2021] [Indexed: 02/05/2023] Open
Abstract
Scabies is a neglected tropical disease (NTD) of the skin that is caused by the mite Sarcoptes scabiei. It is considered to be an important public health problem in many regions. The disease is at its most prevalent in low-resource countries where there are overcrowded living conditions coupled with poor hygiene. In some regions, mass drug administration using ivermectin is a key population-based approach to the control of scabies. Before starting a patient on specific treatment, confirming the diagnosis by accurate and rapid identification of the organism is critical. Different laboratory-based techniques for scabies have been developed in the last few decades. These include direct microscopy and histopathology. More recently, serological testing, dermoscopy and different molecular techniques have been developed as diagnostic methods for scabies. To date, none of these, apart from microscopy and dermoscopy, has been translated into routine clinical laboratory practice. A simple point-of-care or laboratory test would provide a rapid and confirmed diagnosis and early institution of effective treatment. In this review we present an update on the laboratory techniques currently in use for the identification of scabies.
Collapse
Affiliation(s)
- Emmanuel Edwar Siddig
- Nile University, Faculty of Medicine, Khartoum, Sudan.,Erasmus Medical Center, University Medical Center Rotterdam, Department of Medical Microbiology and Infectious Diseases, Wytemaweg 80 3015 CN, Rotterdam, The Netherlands
| | - Roderick Hay
- Kings College London, Guys Campus, London SE1 9RT,UK
| |
Collapse
|
12
|
Development of a rapid scabies immunodiagnostic assay based on transcriptomic analysis of Sarcoptes scabiei var. nyctereutis. Sci Rep 2021; 11:6455. [PMID: 33742008 PMCID: PMC7979781 DOI: 10.1038/s41598-021-85290-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 02/26/2021] [Indexed: 11/09/2022] Open
Abstract
Scabies is a highly contagious skin disease caused by the mite Sarcoptes scabiei that affects many mammals. However, the sensitivity of traditional tests for scabies diagnosis in humans is less than 50%. To simplify the diagnosis of scabies, methods that are simple, sensitive, specific, and cost-effective are required. We developed an immunodiagnostic test based on S. scabiei var. nyctereutis RNA-seq data collected from Japanese raccoon dogs with sarcoptic mange. Three candidate antigens-a highly expressed hypothetical protein "QR98_0091190," another mite allergen known as "SMIPP-Cc," and an abundant "vitellogenin-like protein"-were evaluated by western-blot analysis. A lateral flow immunoassay, using specific antibodies against the vitellogenin-like protein, successfully detected scabies in the skin flakes of S. scabiei-infected raccoon dogs. This assay can potentially diagnose scabies more accurately in wildlife, as well as in humans.
Collapse
|
13
|
Morgado-Carrasco D, Fustà-Novell X, Rizo D, Alsina M. Slowly Spreading Scabies With a Diagnosis Confirmed by Confocal Reflectance Microscopy: New Technologies for Diagnosis. ACTAS DERMO-SIFILIOGRAFICAS 2021. [DOI: 10.1016/j.adengl.2021.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
|
14
|
Chng L, Holt DC, Field M, Francis JR, Tilakaratne D, Dekkers MH, Robinson G, Mounsey K, Pavlos R, Bowen AC, Fischer K, Papenfuss AT, Gasser RB, Korhonen PK, Currie BJ, McCarthy JS, Pasay C. Molecular diagnosis of scabies using a novel probe-based polymerase chain reaction assay targeting high-copy number repetitive sequences in the Sarcoptes scabiei genome. PLoS Negl Trop Dis 2021; 15:e0009149. [PMID: 33626043 PMCID: PMC7939366 DOI: 10.1371/journal.pntd.0009149] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 03/08/2021] [Accepted: 01/15/2021] [Indexed: 01/23/2023] Open
Abstract
Background The suboptimal sensitivity and specificity of available diagnostic methods for scabies hampers clinical management, trials of new therapies and epidemiologic studies. Additionally, parasitologic diagnosis by microscopic examination of skin scrapings requires sample collection with a sharp scalpel blade, causing discomfort to patients and difficulty in children. Polymerase chain reaction (PCR)-based diagnostic assays, combined with non-invasive sampling methods, represent an attractive approach. In this study, we aimed to develop a real-time probe-based PCR test for scabies, test a non-invasive sampling method and evaluate its diagnostic performance in two clinical settings. Methodology/Principal findings High copy-number repetitive DNA elements were identified in draft Sarcoptes scabiei genome sequences and used as assay targets for diagnostic PCR. Two suitable repetitive DNA sequences, a 375 base pair microsatellite (SSR5) and a 606 base pair long tandem repeat (SSR6), were identified. Diagnostic sensitivity and specificity were tested using relevant positive and negative control materials and compared to a published assay targeting the mitochondrial cox1 gene. Both assays were positive at a 1:100 dilution of DNA from a single mite; no amplification was observed in DNA from samples from 19 patients with other skin conditions nor from house dust, sheep or dog mites, head and body lice or from six common skin bacterial and fungal species. Moderate sensitivity of the assays was achieved in a pilot study, detecting 5/7 (71.4% [95% CI: 29.0% - 96.3%]) of clinically diagnosed untreated scabies patients). Greater sensitivity was observed in samples collected by FLOQ swabs compared to skin scrapings. Conclusions/Significance This newly developed qPCR assay, combined with the use of an alternative non-invasive swab sampling technique offers the possibility of enhanced diagnosis of scabies. Further studies will be required to better define the diagnostic performance of these tests. As scabies control efforts continue to grow, scarcity of diagnostic options hinders success of elimination efforts in endemic areas. Efficiency in large-scale monitoring is further obstructed by invasive sample collection techniques, which are often uncomfortable for patients, and lack sensitivity. We have developed two PCR-based diagnostic assays targeting repetitive DNA elements. These were identified using new data on the S. scabiei genome. Targeting these elements by PCR improved the detection of scabies DNA. Enhanced sensitivity was demonstrated when tested against routine microscopy and a published PCR-based diagnostic assay. When combined with a non-invasive, effective FLOQ swab sampling method, the developed qPCR-based assays may provide a useful complementary tool for diagnosis of scabies, and its application will likely improve scabies control in target populations.
Collapse
Affiliation(s)
- Lena Chng
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Deborah C. Holt
- Menzies School of Health Research, Charles Darwin University, Darwin, Australia
- College of Health and Human Sciences, Charles Darwin University, Darwin, Australia
| | - Matt Field
- Centre for Tropical Bioinformatics and Molecular Biology and Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Australia
- Genome Informatics, John Curtin School of Medical Research, Australian National University, Canberra, Australia
| | - Joshua R. Francis
- Menzies School of Health Research, Charles Darwin University, Darwin, Australia
- Royal Darwin Hospital, Tiwi, Australia
| | - Dev Tilakaratne
- Royal Darwin Hospital, Tiwi, Australia
- Darwin Dermatology, Tiwi, Australia
| | - Milou H. Dekkers
- Queensland Animal Science Precinct, University of Queensland, Gatton, Australia
| | - Greg Robinson
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Kate Mounsey
- University of Sunshine Coast, Sippy Downs, Australia
| | - Rebecca Pavlos
- Wesfarmers Centre for Vaccines and Infectious Diseases, Telethon Kids Institute, University of Western Australia, Perth, Australia
| | - Asha C. Bowen
- Menzies School of Health Research, Charles Darwin University, Darwin, Australia
- Wesfarmers Centre for Vaccines and Infectious Diseases, Telethon Kids Institute, University of Western Australia, Perth, Australia
- Department of Infectious Diseases, Perth Children’s Hospital, Perth, Australia
| | - Katja Fischer
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | | | - Robin B. Gasser
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary Sciences, The University of Melbourne, Parkville, Australia
| | - Pasi K. Korhonen
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary Sciences, The University of Melbourne, Parkville, Australia
| | - Bart J. Currie
- Menzies School of Health Research, Charles Darwin University, Darwin, Australia
- Royal Darwin Hospital, Tiwi, Australia
| | | | - Cielo Pasay
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
- * E-mail:
| |
Collapse
|
15
|
Morgado-Carrasco D, Fustà-Novell X, Rizo D, Alsina M. Slowly Spreading Scabies With a Diagnosis Confirmed by Confocal Reflectance Microscopy: New Technologies for Diagnosis. ACTAS DERMO-SIFILIOGRAFICAS 2020; 112:271-273. [PMID: 33130014 DOI: 10.1016/j.ad.2019.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 09/20/2019] [Accepted: 10/05/2019] [Indexed: 11/17/2022] Open
Affiliation(s)
- D Morgado-Carrasco
- Servicio de Dermatología, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, España
| | - X Fustà-Novell
- Servicio de Dermatología, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, España
| | - D Rizo
- Servicio de Dermatología, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, España
| | - M Alsina
- Servicio de Dermatología, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, España.
| |
Collapse
|
16
|
Engelman D, Yoshizumi J, Hay R, Osti M, Micali G, Norton S, Walton S, Boralevi F, Bernigaud C, Bowen A, Chang A, Chosidow O, Estrada‐Chavez G, Feldmeier H, Ishii N, Lacarrubba F, Mahé A, Maurer T, Mahdi M, Murdoch M, Pariser D, Nair P, Rehmus W, Romani L, Tilakaratne D, Tuicakau M, Walker S, Wanat K, Whitfeld M, Yotsu R, Steer A, Fuller L. The 2020 International Alliance for the Control of Scabies Consensus Criteria for the Diagnosis of Scabies. Br J Dermatol 2020; 183:808-820. [PMID: 32034956 PMCID: PMC7687112 DOI: 10.1111/bjd.18943] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/07/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND Scabies is a common parasitic skin condition that causes considerable morbidity globally. Clinical and epidemiological research for scabies has been limited by a lack of standardization of diagnostic methods. OBJECTIVES To develop consensus criteria for the diagnosis of common scabies that could be implemented in a variety of settings. METHODS Consensus diagnostic criteria were developed through a Delphi study with international experts. Detailed recommendations were collected from the expert panel to define the criteria features and guide their implementation. These comments were then combined with a comprehensive review of the available literature and the opinion of an expanded group of international experts to develop detailed, evidence-based definitions and diagnostic methods. RESULTS The 2020 International Alliance for the Control of Scabies (IACS) Consensus Criteria for the Diagnosis of Scabies include three levels of diagnostic certainty and eight subcategories. Confirmed scabies (level A) requires direct visualization of the mite or its products. Clinical scabies (level B) and suspected scabies (level C) rely on clinical assessment of signs and symptoms. Evidence-based, consensus methods for microscopy, visualization and clinical symptoms and signs were developed, along with a media library. CONCLUSIONS The 2020 IACS Criteria represent a pragmatic yet robust set of diagnostic features and methods. The criteria may be implemented in a range of research, public health and clinical settings by selecting the appropriate diagnostic levels and subcategories. These criteria may provide greater consistency and standardization for scabies diagnosis. Validation studies, development of training materials and development of survey methods are now required. What is already known about this topic? The diagnosis of scabies is limited by the lack of accurate, objective tests. Microscopy of skin scrapings can confirm the diagnosis, but it is insensitive, invasive and often impractical. Diagnosis usually relies on clinical assessment, although visualization using dermoscopy is becoming increasingly common. These diagnostic methods have not been standardized, hampering the interpretation of findings from clinical research and epidemiological surveys, and the development of scabies control strategies. What does this study add? International consensus diagnostic criteria for common scabies were developed through a Delphi study with global experts. The 2020 International Alliance for the Control of Scabies (IACS) Criteria categorize diagnosis at three levels of diagnostic certainty (confirmed, clinical and suspected scabies) and eight subcategories, and can be adapted to a range of research and public health settings. Detailed definitions and figures are included to aid training and implementation. The 2020 IACS Criteria may facilitate the standardization of scabies diagnosis.
Collapse
|
17
|
Kim JK, Chun EJ, Yang SY, Kim KS, Kim SS, Kim CW. Development and efficacy of a nested real-time quantitative polymerase chain reaction to identify the cytochrome c oxidase subunit 1 gene of Sarcoptes scabiei var. hominis for diagnosis and monitoring of ordinary scabies. Br J Dermatol 2020; 183:1116-1117. [PMID: 32594512 DOI: 10.1111/bjd.19340] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/17/2020] [Accepted: 06/20/2020] [Indexed: 11/28/2022]
Affiliation(s)
- J K Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - E J Chun
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - S Y Yang
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - K S Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - S S Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - C W Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| |
Collapse
|
18
|
Bae M, Kim JY, Jung J, Cha HH, Jeon NY, Lee HJ, Kim MJ, Chang SE, Kim SH. Diagnostic value of the molecular detection of Sarcoptes scabiei from a skin scraping in patients with suspected scabies. PLoS Negl Trop Dis 2020; 14:e0008229. [PMID: 32255795 PMCID: PMC7164670 DOI: 10.1371/journal.pntd.0008229] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 04/17/2020] [Accepted: 03/17/2020] [Indexed: 12/21/2022] Open
Abstract
Scabies is a highly contagious parasitic disease associated with long-term residence in nursing homes, and it is a public health burden worldwide. However, atypical skin manifestations are frequent and the widely used diagnostic test based on microscopic examinations has limited sensitivity. We evaluated the diagnostic value of polymerase chain reaction (PCR) from skin scraping in patients with suspected scabies. Adult patients with suspected scabies, unrelated diseases or healthy volunteers were enrolled at a tertiary hospital, in Seoul, South Korea, from December 2017 through October 2018. We classified participants based on the consensus criteria established by the International Alliance for the Control of Scabies in 2018; confirmed (microscopic mite detection), clinical (scabies burrow or typical lesions with two history features including itch and close contact with scabies patients), suspected scabies (typical lesion with one history feature or atypical lesion with two history features), or no scabies. PCR was performed on the skin scrapings to target the cytochrome c oxidase subunit 1 (cox1) gene of Sarcoptes scabiei. A total of 47 participants, 33 with suspected scabies, 10 with unrelated diseases, and 4 healthy volunteers were enrolled. Of the 33 patients, 22 were classified as confirmed scabies, 2 as clinical scabies, 6 as suspected scabies, and 3 as no scabies. The sensitivities of the microscopic examination were 100%, 92%, and 73% in confirmed scabies; confirmed and clinical scabies; and confirmed, clinical, and suspected scabies, respectively (p = 0.006). The sensitivities of PCR were 86%, 83%, and 80% in confirmed scabies; confirmed and clinical scabies; and confirmed, clinical, and suspected scabies, respectively (p = 0.59). The specificity of the scabies PCR in the no scabies control was 100% (95% CI = 80–100).PCR testing for scabies may be helpful in the improvement of sensitivity for the diagnosis of scabies by clinical criteria. Scabies occasionally presents in atypical forms causing a delay in diagnosis, which can lead to the outbreaks in residential and nursing care for elderly people. We hypothesized that polymerase chain reaction (PCR) detection of Sarcoptes scabiei DNA directly has higher sensitivity than microscopic examination. Recently, clinical consensus criteria have been proposed by the International Alliance for the Control of Scabies (IACS) to overcome the low sensitivities of conventional diagnostic tests for scabies. We thus evaluated the diagnostic capability of in-house real-time PCR for the diagnosis of scabies from skin scraping in subjects with suspected scabies and with unrelated disease according to the criteria of the IACS. We found that the diagnostic sensitivity of scabies PCR maintained between 86% and 80% as the level of diagnostic certainty by the IACS criteria decreased, while the diagnostic sensitivity of microscopic examinations decreased from 100% to 73% as the level of diagnostic certainty by the IACS criteria decreased. Our data suggested that our in-house scabies PCR test was a useful adjunct in the improvement for the diagnosis of scabies by the consensus criteria.
Collapse
Affiliation(s)
- Moonsuk Bae
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Ji Yeun Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jiwon Jung
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Hye Hee Cha
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Na-Young Jeon
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Hyun-Jung Lee
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Min Jae Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Sung Eun Chang
- Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
- * E-mail: (SEC); (S-HK)
| | - Sung-Han Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
- * E-mail: (SEC); (S-HK)
| |
Collapse
|
19
|
Chandler D, Fuller L. Removing the mystery of mite isolation – opening up scabies diagnosis? Br J Dermatol 2019; 182:21-22. [DOI: 10.1111/bjd.18429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- D.J. Chandler
- Brighton and Sussex University Hospitals NHS Trust Brighton U.K
| | - L.C. Fuller
- Chelsea and Westminster Hospital NHS Foundation Trust London U.K
| |
Collapse
|
20
|
Delaunay P, Hérissé A, Hasseine L, Chiaverini C, Tran A, Mary C, Del Giudice P, Marty P, Akhoundi M, Hubiche T. Scabies polymerase chain reaction with standardized dry swab sampling: an easy tool for cluster diagnosis of human scabies. Br J Dermatol 2019; 182:197-201. [DOI: 10.1111/bjd.18017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2019] [Indexed: 11/27/2022]
Affiliation(s)
- P. Delaunay
- Parasitologie‐Mycologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
- MIVEGEC UMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - A.L. Hérissé
- Parasitologie‐Mycologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
- Urgences Pédiatriques Centre Hospitalier Universitaire Hôpital Pédiatrique Lenval Nice France
| | - L. Hasseine
- Parasitologie‐Mycologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
| | - C. Chiaverini
- Dermatologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
| | - A. Tran
- Urgences Pédiatriques Centre Hospitalier Universitaire Hôpital Pédiatrique Lenval Nice France
| | - C. Mary
- Parasitologie‐Mycologie Assistance Publique des Hôpitaux de Marseille Hôpital de La Timone Marseille France
| | | | - P. Marty
- Parasitologie‐Mycologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
- Inserm U1065 Centre Méditerranéen de Médecine Moléculaire Université Nice‐Sophia Antipolis Nice France
| | - M. Akhoundi
- Parasitologie‐Mycologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
- MIVEGEC UMR IRD 224‐CNRS 5290‐Université de Montpellier Montpellier France
| | - T. Hubiche
- Dermatologie Hôpital de l'Archet Centre Hospitalier Universitaire de Nice Nice France
- Infectiologie‐Dermatologie Hôpital Bonnet Fréjus France
| |
Collapse
|
21
|
Wong SSY, Poon RWS, To KKW, Chan JFW, Lu G, Xing F, Cheng VCC, Yuen KY. Improving the specific diagnosis of trematode, cestode and nematode infections by a multiplex single-tube real-time PCR assay. J Clin Pathol 2019; 72:487-492. [PMID: 30952829 DOI: 10.1136/jclinpath-2018-205590] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 02/25/2019] [Accepted: 03/19/2019] [Indexed: 11/04/2022]
Abstract
AIMS Helminth infections are becoming uncommon in high-income countries and laboratory staff may lose expertise in their morphological identification, especially in histological sections where speciation of helminths is challenging. Commercially available molecular diagnostic panels for faecal specimens only offer tests for protozoa but not helminths. We aim to improve the identification accuracy of helminths using a multiplex PCR assay. METHODS We designed three pairs of PCR primers and probes targeting multicopy genes for a multiplex single-tube real-time PCR assay which covers 16 trematode (28S rRNA gene), 24 cestode (cox1 gene) and 33 nematode (cox1 gene) species. Helminths (n=27) from faecal samples (n=10), fresh parasites (n=11), formalin-fixed specimens (n=4), cerebrospinal fluid (n=1) and bile (n=1) were examined morphologically and tested by PCR. Fifty stool samples negative for parasites by microscopy were also tested. RESULTS The PCR assay correctly identified the genera of all tested helminths. Agarose gel electrophoresis and sequencing of the purified PCR amplicons confirmed that the PCR products were of correct sizes with 100% correlation with the respective species. Sequencing of the cox1 gene failed to identify Capillaria spp. in one sample owing to the lack of corresponding sequences in GenBank. PCR and sequencing of the nematode 18S rRNA gene using consensus primers showed 100% homology with Capillaria spp. sequence. No positive PCR products were found in the negative stool samples. CONCLUSIONS The highly specific test correctly identified all helminths in our cohort. It is a useful adjunct to helminth identification in difficult situations such as histological sections.
Collapse
Affiliation(s)
- Samson S Y Wong
- Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China .,Carol Yu Centre for Infection, The University of Hong Kong, Hong Kong, China
| | - Rosana W S Poon
- Department of Microbiology, Queen Mary Hospital, Hong Kong, China
| | - Kelvin K W To
- Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.,Carol Yu Centre for Infection, The University of Hong Kong, Hong Kong, China.,Department of Clinical Microbiology and Infection Control, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China
| | - Jasper F W Chan
- Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.,Carol Yu Centre for Infection, The University of Hong Kong, Hong Kong, China.,Department of Clinical Microbiology and Infection Control, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China.,Hainan Medical University-The University of Hong Kong Joint Laboratory of Tropical Infectious Diseases, Hainan Medical University, Haikou, Hainan, and The University of Hong Kong, Hong Kong, China
| | - Gang Lu
- Hainan Medical University-The University of Hong Kong Joint Laboratory of Tropical Infectious Diseases, Hainan Medical University, Haikou, Hainan, and The University of Hong Kong, Hong Kong, China.,Department of Pathogen Biology, Hainan Medical University, Haikou, Hainan, China.,Key Laboratory of Translational Tropical Medicine, Hainan Medical University, Haikou, Hainan, China
| | - Fanfan Xing
- Department of Clinical Microbiology and Infection Control, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China
| | | | - Kwok-Yung Yuen
- Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.,Carol Yu Centre for Infection, The University of Hong Kong, Hong Kong, China.,Department of Microbiology, Queen Mary Hospital, Hong Kong, China.,Department of Clinical Microbiology and Infection Control, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China.,Hainan Medical University-The University of Hong Kong Joint Laboratory of Tropical Infectious Diseases, Hainan Medical University, Haikou, Hainan, and The University of Hong Kong, Hong Kong, China.,State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong, Hong Kong, China.,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The University of Hong Kong, Hong Kong, China
| |
Collapse
|
22
|
van der Linden N, van Gool K, Gardner K, Dickinson H, Agostino J, Regan DG, Dowden M, Viney R. A systematic review of scabies transmission models and data to evaluate the cost-effectiveness of scabies interventions. PLoS Negl Trop Dis 2019; 13:e0007182. [PMID: 30849124 PMCID: PMC6426261 DOI: 10.1371/journal.pntd.0007182] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 03/20/2019] [Accepted: 01/23/2019] [Indexed: 01/12/2023] Open
Abstract
Background Scabies is a common dermatological condition, affecting more than 130 million people at any time. To evaluate and/or predict the effectiveness and cost-effectiveness of scabies interventions, disease transmission modelling can be used. Objective To review published scabies models and data to inform the design of a comprehensive scabies transmission modelling framework to evaluate the cost-effectiveness of scabies interventions. Methods Systematic literature search in PubMed, Medline, Embase, CINAHL, and the Cochrane Library identified scabies studies published since the year 2000. Selected papers included modelling studies and studies on the life cycle of scabies mites, patient quality of life and resource use. Reference lists of reviews were used to identify any papers missed through the search strategy. Strengths and limitations of identified scabies models were evaluated and used to design a modelling framework. Potential model inputs were identified and discussed. Findings Four scabies models were published: a Markov decision tree, two compartmental models, and an agent-based, network-dependent Monte Carlo model. None of the models specifically addressed crusted scabies, which is associated with high morbidity, mortality, and increased transmission. There is a lack of reliable, comprehensive information about scabies biology and the impact this disease has on patients and society. Discussion Clinicians and health economists working in the field of scabies are encouraged to use the current review to inform disease transmission modelling and economic evaluations on interventions against scabies. Scabies is a neglected tropical disease affecting more than 130 million people, with major costs on health care systems worldwide. While effective treatments exist, it is unknown which treatment strategies result in the best outcomes against the lowest costs, and to what extent this differs between communities. Health economic modelling can help answer these questions, but has rarely been used in this disease area. This review discusses all available scabies transmission models (n = 4), and uses them to create a new, comprehensive modelling framework. This framework can be used as aid for creating a scabies transmission model, the details of which will be determined by the context (population) and the question being addressed. The current paper also reviews the data that is needed to inform scabies modelling: on scabies biology, quality of life and resource use. Unfortunately, available data is limited and particularly data on crusted scabies (associated with high morbidity and mortality rates) is rare. With this review, we hope to assist researchers and policy makers to predict and/or evaluate the cost-effectiveness of interventions against scabies in their population(s) of interest. To tackle scabies, it is key to use effective treatment strategies in a cost-effective and sustainable way. The models and data described in this review, may help researchers, clinicians and funding bodies to facilitate this.
Collapse
Affiliation(s)
- Naomi van der Linden
- Centre for Health Economics Research and Evaluation, University of Technology Sydney, Sydney, Australia
- * E-mail:
| | - Kees van Gool
- Centre for Health Economics Research and Evaluation, University of Technology Sydney, Sydney, Australia
| | - Karen Gardner
- Public Service Research Group, School of Business UNSW Canberra, Canberra, Australia
| | - Helen Dickinson
- Public Service Research Group, School of Business UNSW Canberra, Canberra, Australia
| | - Jason Agostino
- Academic Unit of General Practice, Australian National University, Canberra, Australia
| | | | | | - Rosalie Viney
- Centre for Health Economics Research and Evaluation, University of Technology Sydney, Sydney, Australia
| |
Collapse
|
23
|
Chandler D, Fuller L. A Review of Scabies: An Infestation More than Skin Deep. Dermatology 2018; 235:79-90. [DOI: 10.1159/000495290] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 11/12/2018] [Indexed: 11/19/2022] Open
Abstract
Human scabies, a common infestation, has a worldwide distribution with a variable impact and presentation depending on the clinical situation. In developed, high-income settings, health institution and residential home outbreaks challenge health and social care services. In resource-poor settings, it is the downstream sequelae of staphylococcal and streptococcal bacteraemia, induced by scratching, which have a significant impact on the long-term health of communities. Over the past decade scabies has been recognised as a “neglected tropical disease” (NTD) by the World Health Organisation, has an accepted practical system of global diagnostic criteria and is being adopted into integrated programmes of mass drug administration for NTDs in field settings. This review seeks to summarise the recent advances in the understanding of scabies and highlight the advocacy and research headlines with their implication for diagnosis and management of outbreaks and individuals. In addition, it will indicate the priorities and questions that remain.
Collapse
|
24
|
Fraser TA, Carver S, Martin AM, Mounsey K, Polkinghorne A, Jelocnik M. A Sarcoptes scabiei specific isothermal amplification assay for detection of this important ectoparasite of wombats and other animals. PeerJ 2018; 6:e5291. [PMID: 30065882 PMCID: PMC6065476 DOI: 10.7717/peerj.5291] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 07/02/2018] [Indexed: 11/20/2022] Open
Abstract
Background The globally distributed epidermal ectoparasite, Sarcoptes scabiei, is a serious health and welfare burden to at-risk human and animal populations. Rapid and sensitive detection of S. scabiei infestation is critical for intervention strategies. While direct microscopy of skin scrapings is a widely utilised diagnostic method, it has low sensitivity. PCR, alternatively, has been shown to readily detect mite DNA even in microscopy-negative skin scrapings. However, a limitation to the latter method is the requirements for specialised equipment and reagents. Such resources may not be readily available in regional or remote clinical settings and are an important consideration in diagnosis of this parasitic disease. Methodology A Loop Mediated Isothermal Amplification (LAMP) assay targeting the ITS-2 gene for S. scabiei was developed and evaluated on clinical samples from various hosts, previously screened with conventional S. scabies-specific PCR. Species specificity of the newly developed LAMP assay was tested against a range of DNA samples from other arthropods. The LAMP assays were performed on a real-time fluorometer as well as thermal cycler to evaluate an end-point of detection. Using skin scrapings, a rapid sample processing method was assessed to eliminate extensive processing times involved with DNA extractions prior to diagnostic assays, including LAMP. Results The S. scabiei LAMP assay was demonstrated to be species-specific and able to detect DNA extracted from a single mite within a skin scraping in under 30 minutes. Application of this assay to DNA extracts from skin scrapings taken from a range of hosts revealed 92.3% congruence (with 92.50% specificity and 100% sensitivity) to the conventional PCR detection of S. scabiei. Preliminary results have indicated that diagnostic outcome from rapidly processed dry skin scrapings using our newly developed LAMP is possible in approximately 40 minutes. Discussion We have developed a novel, rapid and robust molecular assay for detecting S. scabiei infesting humans and animals. Based on these findings, we anticipate that this assay will serve an important role as an ancillary diagnostic tool at the point-of-care, complementing existing diagnostic protocols for S. scabiei.
Collapse
Affiliation(s)
- Tamieka A Fraser
- USC Animal Research Centre, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy Downs, Australia.,Department of Biological Sciences, University of Tasmania, Sandy Bay, Australia
| | - Scott Carver
- Department of Biological Sciences, University of Tasmania, Sandy Bay, Australia
| | - Alynn M Martin
- Department of Biological Sciences, University of Tasmania, Sandy Bay, Australia
| | - Kate Mounsey
- USC Animal Research Centre, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy Downs, Australia.,School of Health and Sport Sciences, University of the Sunshine Coast, Sippy Downs, Australia
| | - Adam Polkinghorne
- USC Animal Research Centre, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy Downs, Australia
| | - Martina Jelocnik
- USC Animal Research Centre, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy Downs, Australia
| |
Collapse
|
25
|
Hahm JE, Kim CW, Kim SS. The efficacy of a nested polymerase chain reaction in detecting the cytochrome c oxidase subunit 1 gene of Sarcoptes scabiei var. hominis for diagnosing scabies. Br J Dermatol 2018; 179:889-895. [PMID: 29624634 DOI: 10.1111/bjd.16657] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/22/2018] [Indexed: 11/26/2022]
Abstract
BACKGROUND A widespread scabies infestation, associated with long-term residence in nursing homes, is becoming an issue in high-income countries. Mineral oil examination is regarded as the gold standard in diagnosing scabies, but the sensitivity of this method is generally low - approximately 50%. Molecular techniques may contribute to enhancing the sensitivity of current tests for laboratory diagnosis of human scabies. OBJECTIVES To develop new primers for a nested polymerase chain reaction (PCR) for the cytochrome c oxidase subunit 1 (cox1) gene of Sarcoptes scabiei var. hominis to increase the sensitivity of a previously developed conventional PCR. METHODS Patients with clinically suspected scabies underwent dermoscopy-guided skin scraping with microscopic examination. The diagnosis was positive for scabies when mites or eggs were found under the microscope, and patients were then designated as 'microscopy positive'. Patients who presented with negative microscopic results were placed in the 'microscopy-negative' group. Skin scrapings were collected from both groups for PCR. RESULTS Of the total 63 samples, 28 were microscopy positive and 35 were negative with no differences in sex and age between the two groups. All microscopically proven cases of scabies were positive using the cox1 nested PCR. Among microscopy-negative samples, S. scabieiDNA was detected in nine. If sensitivity of the cox1 nested PCR is considered 100% [95% confidence interval (CI) 90·5-100], then sensitivity of microscopy is 75·7% (95% CI 58·8-88·2; P = 0·004). CONCLUSIONS Nested PCR can be successfully used as an alternative method for diagnosing suspected scabies. Therefore, infection control measures and treatments can be initiated before significant transmission occurs, minimizing the risk of outbreaks.
Collapse
Affiliation(s)
- J E Hahm
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - C W Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - S S Kim
- Department of Dermatology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| |
Collapse
|
26
|
Meletis G, Oustas E, Kemanetzi C, Botziori C. Is the Simple Saline Mount Technique More Effective than Potassium Hydroxide for the Microscopic Detection of Sarcoptes scabiei? J Parasitol 2018; 104:109. [DOI: 10.1645/17-157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- G. Meletis
- Department of Clinical Microbiology, St. Paul General Hospital of Thessaloniki, Thessaloniki, Greece
| | - E. Oustas
- Department of Clinical Microbiology, St. Paul General Hospital of Thessaloniki, Thessaloniki, Greece
| | - C. Kemanetzi
- Department of Clinical Microbiology, St. Paul General Hospital of Thessaloniki, Thessaloniki, Greece
| | - C. Botziori
- Department of Clinical Microbiology, St. Paul General Hospital of Thessaloniki, Thessaloniki, Greece
| |
Collapse
|
27
|
Fraser TA, Martin A, Polkinghorne A, Carver S. Comparative diagnostics reveals PCR assays on skin scrapings is the most reliable method to detect Sarcoptes scabiei infestations. Vet Parasitol 2018; 251:119-124. [PMID: 29426467 DOI: 10.1016/j.vetpar.2018.01.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 01/09/2018] [Accepted: 01/10/2018] [Indexed: 10/18/2022]
Abstract
Sarcoptic mange is a globally significant parasitic disease of humans and other animals, both domestic and wild. But clinical diagnosis of S. scabiei infestation, using the standard skin scraping followed by microscopy technique, remains highly variable (predominantly due to false-negatives), and a major challenge for human and animal welfare. Here, we utilised a unique sample set from bare-nosed wombats (Vombatus ursinus) to evaluate a variety of putatively useful diagnostic approaches for S. scabiei. Against the standard of skin scrapings followed by microscopy, we compared observational scoring of mange severity (often employed in field studies of wildlife), PCR on skin scrapings (recently proposed as an improvement for humans and other animals), and PCR on skin swabs (proposed a non-invasive method for humans and other animals). We find that observational scoring positively correlated with counts of S. scabiei from skin scrapings, particularly as mange severity increases, but underdiagnoses early mange. Species-specific PCR for S. scabiei on skin scrapings had enhanced capacity for mite detection relative to microscopy. Finally, the non-invasive sampling method of PCR on skin swab samples had a high congruence to skin scraping microscopy, however prospective false negatives as a consequence to sampling is concerning. To our knowledge, this is the first study to simultaneously assess this combination of methods for S. scabiei diagnosis. We conclude that PCR on skin scrapings as an advancement on traditional microscopy, and the other techniques (observational, skin swabs and microscopy) remain useful, but harbour greater false-negatives. Outcomes are transferrable to diagnosis of S. scabiei for other host species, including humans, particularly for crusted mange and potentially ordinary mange also.
Collapse
Affiliation(s)
- Tamieka A Fraser
- School of Biological Sciences, University of Tasmania, Sandy Bay, 7001, TAS, Australia; Centre for Animal Health Innovation, University of the Sunshine Coast, 91 Sippy Downs Drive, Sippy Downs, 4556, QLD, Australia.
| | - Alynn Martin
- School of Biological Sciences, University of Tasmania, Sandy Bay, 7001, TAS, Australia
| | - Adam Polkinghorne
- Centre for Animal Health Innovation, University of the Sunshine Coast, 91 Sippy Downs Drive, Sippy Downs, 4556, QLD, Australia
| | - Scott Carver
- School of Biological Sciences, University of Tasmania, Sandy Bay, 7001, TAS, Australia
| |
Collapse
|
28
|
Sarcoptes scabiei on hedgehogs in New Zealand. Parasitol Res 2018; 117:697-703. [DOI: 10.1007/s00436-017-5739-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Accepted: 12/28/2017] [Indexed: 10/18/2022]
|
29
|
Desiandura K, Lastuti NDR, Suwanti LT, Handijatno D. MOLECULAR IDENTIFICATION OF SARCOPTES SCABIEI VAR. CUNICULI FROM SURABAYA AND MALANG REGIONS OF EAST JAVA. INDONESIAN JOURNAL OF TROPICAL AND INFECTIOUS DISEASE 2017. [DOI: 10.20473/ijtid.v6i6.5436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Scabies is a zoonotic skin disease caused by Sarcoptes scabiei mites. As an emerging/re-emerging parasitic disease, scabies represents a significant global threat to both human and animal health. Numerous cases of scabies in Indonesia have been reported, which support research on the prevalence of S. scabiei. However, most such studies have involved conventional morphological studies, with limited molecular diagnostic studies. The purpose of the present study was the genetic characterization of S. scabiei var. cuniculi in domestic rabbits to generate baseline genotypic data. S. scabiei var. cuniculi was isolated and identified from scabies-infected rabbits from the Surabaya and Malang regions of East Java. Molecular identification was performed using Polymerase Chain Reaction (PCR) using specific primers targeting the COX1 gene. We performed COX1 PCR using rabbit isolates of S. scabiei from Indonesia. To the best of our knowledge, no such study had been reported previously. This study was performed in the Laboratory of Veterinary Parasitology, Faculty of Veterinary Medicine and the Tropical Disease Diagnostic Center Laboratory, Universitas Airlangga. The results with agarose gel electrophoresis revealed a 289 bp PCR product amplified from the DNA of S. scabiei isolates from both Surabaya and Malang in accordance with the expected COX1 amplicon size, that indicated a single band 289 bp in length, demonstrating specific detection of S. scabiei var. cuniculi from Surabaya and Malang using COX1 primers. The results were consistent with the calculated amplicon size based on primer positions within the COX1 locus, with the forward primer spanning nucleotides 61–94, and the reverse primer spanning nucleotides 331–350 ( 350 − 61 = 289 bp). PCR genotyping of the isolates yielded an identical nucleotide length of 289 bp. Further studies are required to sequence the amplified fragments for homology assessment.
Collapse
|
30
|
Molecular identification of cestodes and nematodes by cox1 gene real-time PCR and sequencing. Diagn Microbiol Infect Dis 2017; 89:185-190. [PMID: 28865743 DOI: 10.1016/j.diagmicrobio.2017.07.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 07/24/2017] [Accepted: 07/24/2017] [Indexed: 11/22/2022]
Abstract
Unlike bacteria and fungi, identification of helminths by gene sequencing is not well-standardized. No "pan-cestode" or "pan-nematode" PCR primers are available. In this study, we designed 2 pairs of PCR primers for amplifying the cox1 genes of cestodes and nematodes respectively and validated their usefulness for real-time PCR and sequencing identification using clinical samples with cestodes and nematodes collected from a variety of animals and human in 7 countries in Asia, Europe and Africa. The detection limits of the cox1 real-time PCR assays for cestodes and nematodes were 10 copies/reaction of extracted DNA, corresponding to CT values of 33 and 31 respectively. Real-time PCR using the 2 pairs of primers and probes showed positive results for all 20 clinical samples of cestodes and nematodes. Using phenotypic identification results as the reference standard, DNA sequencing successfully identified all the 5 cestodes and 7 nematodes with cox1 gene sequences available in GenBank, with all these names appearing as the best match of the cox1 gene sequences of the corresponding clinical samples. The percentage nucleotide identities between the cox1 gene sequences of the samples and those of the corresponding best match sequences in GenBank were 98-100%. For the remaining 5 cestodes and 3 nematodes, the corresponding cox1 gene sequences were not available in GenBank. cox1 gene sequencing is discriminative enough for accurately identifying most of the cestodes and nematodes in the present study. Further expansion of the cox1 gene sequence database will enable accurate identification of more cestodes and nematodes.
Collapse
|
31
|
Kandi V. Laboratory Diagnosis of Scabies Using a Simple Saline Mount: A Clinical Microbiologist's Report. Cureus 2017; 9:e1102. [PMID: 28435762 PMCID: PMC5398661 DOI: 10.7759/cureus.1102] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Scabies is a skin condition caused by infestation of the mite Sarcoptes scabiei. Sarcoptes scabiei var. hominis is an arthropod member belonging to the order Acarina. Scabies is present throughout the world and is prevalent in all age groups, mostly involving people frequently in contact with animals, children, women, and elderly people. Predisposing factors for scabies include individuals with immunosuppressive conditions and people residing under low socioeconomic conditions. Skin lesions that occur during mite infestation closely resemble dermatological disorders caused by microbes, including fungi, parasites, and viruses. Laboratory diagnosis of scabies greatly relies on an accurate clinical suspicion and the demonstration of mites in the skin scrapings could be used for confirmation. It should be noted that a greater understanding between a clinician or a dermatologist and a clinical microbiologist is required to successfully diagnose scabies. This report details an easily performed, cost-effective method, the simple saline mount, that a clinical microbiology laboratory should follow to successfully identify mites in skin scrapings.
Collapse
|
32
|
|