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Demodex mite

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https://www.readbyqxmd.com/read/28940244/demodicosis-in-two-patients-with-a-previous-history-of-langerhans-cell-histiocytosis
#1
Marcial Álvarez-Salafranca, Asunción Vicente, Carolina Prat Torres, Andrea Combalia, Manuel Monsonís, Veronica Paola Celis-Passini, María Antonia González-Enseñat
Demodex mites are commensal organisms rarely found in healthy children. Human demodicosis can be classified as a primary or a secondary form. The secondary form in children usually affects severely immunodepressed children. To our knowledge, this is the first report of human demodicosis associated with Langerhans cell histiocytosis. These cases show that this skin disorder can occur months after completing chemotherapy, without recurrence of the systemic disease.
September 21, 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/28926882/-diagnostic-criteria-of-demodex-blepharitis
#2
L Y Liang, J Li, Y Liu
Demodex infestation is a common cause of blepharitis and now is drawing more and more attention from clinicians. Demodex mite is the most common age-related ectoparasite of human being and may be detected from asymptomatic normal population. Furthermore, the pathogenesis of demodicosis remains unclear. Therefore, the commonly accepted diagnostic criteria of demodex infestation related blepharitis have not been established. Herein, we summarize the related studies about ocular demodicosis and comment the debates about the diagnosis of the disease...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28902017/ocular-demodicosis-as-a-potential-cause-of-ocular-surface-inflammation
#3
Xiaohui Luo, Jing Li, Chuan Chen, Scheffer Tseng, Lingyi Liang
Among different species of mites, Demodex folliculorum and Demodex brevis are the only 2 that affect the human eye. Because demodicosis is highly age-dependent and can be found in asymptomatic adults, the pathogenicity of these mites has long been debated. In this study, we summarize our research experience including our most recent study regarding Demodex infestation as a potential cause of ocular inflammatory diseases. Specifically, we describe the pathogenesis of demodicosis and then discuss the results of work investigating the associations and relationships between ocular demodicosis and blepharitis, meibomian gland diseases, and keratitis, in turn...
November 2017: Cornea
https://www.readbyqxmd.com/read/28868794/canine-demodicosis-a-retrospective-study-of-a-veterinary-hospital-population-in-california-usa-2000-2016
#4
Daniel G Bowden, Catherine A Outerbridge, Marguerite B Kissel, Jerome N Baron, Stephen D White
BACKGROUND: Demodex spp. are cutaneous mites that cause clinical disease when present in increased numbers. There is an association in some dogs with underlying systemic disease or immunosuppressive medications. HYPOTHESIS/OBJECTIVES: Retrospective study to document breed predisposition, identify any concurrent diseases or underlying immunosuppressive conditions, and to determine the frequency of demodicosis recurrence after treatment completion. ANIMALS: There were 431 dogs with demodicosis presented to a veterinary teaching hospital in California, USA, from 2000 to 2016...
September 3, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/28846817/the-usefulness-of-investigating-the-possible-underlying-conditions-in-rosacea
#5
G Ciccarese, A Parodi, A Rebora, F Drago
The paper entitled "Rosacea and demodicidosis with gain of function mutation in STAT1″ by Second et al.(1) is of indubitable interest and prompted us to make some observations. The Authors described a patient with cutaneous and ocular rosacea that they related to demodicidosis since oral ivermectin improved the cutaneous lesions(1) . However, the Authors did not demonstrate by skin scraping nor by standardized skin surface biopsy (SSSB) an excessive number of Demodex folliculorum (DF) mites in the pilosebaceous units to justify an oral antiparasitic treatment as a drug of first choice(1) ...
August 28, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28830578/characterization-of-demodex-musculi-infestation-associated-comorbidities-and-topographic-distribution-in-a-mouse-strain-with-defective-adaptive-immunity
#6
Melissa A Nashat, Kerith R Luchins, Michelle L Lepherd, Elyn R Riedel, Joanna N Izdebska, Neil S Lipman
A colony of B6.Cg-Rag1tm1Mom Tyrp1B-w Tg(Tcra,Tcrb)9Rest (TRP1/TCR) mice presented with ocular lesions and ulcerative dermatitis. Histopathology, skin scrapes, and fur plucks confirmed the presence of Demodex spp. in all clinically affected and subclinical TRP1/TCR mice examined (n = 48). Pasteurella pneumotropica and Corynebacterium bovis, both opportunistic pathogens, were cultured from the ocular lesions and skin, respectively, and bacteria were observed microscopically in abscesses at various anatomic locations (including retroorbital sites, tympanic bullae, lymph nodes, and reproductive organs) as well as the affected epidermis...
August 1, 2017: Comparative Medicine
https://www.readbyqxmd.com/read/28761482/molecular-characterization-and-analysis-of-16s-ribosomal-dna-in-some-isolates-of-demodex-folicullorum
#7
Afrooz Daneshparvar, Gholamreza Mowlavi, Hamed Mirjalali, Homa Hajjaran, Iraj Mobedi, Saeed Reza Naddaf, Mohammadreza Shidfar, Mahsa Sadat Makki
BACKGROUND: Demodicosis is one of the most prevalent skin diseases resulting from infestation by Demodex mites. This parasite usually inhabits in follicular infundibulum or sebaceous duct and transmits through close contact with an infested host. METHODS: This study was carried from September 2014 to January 2016 at Tehran University of Medical Sciences, Tehran, Iran. DNA extraction and amplification of 16S ribosomal RNA was performed on four isolates, already obtained from four different patients and identified morphologically though clearing with 10% Potassium hydroxide (KOH) and microscopical examination...
April 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/28747952/human-permanent-ectoparasites-recent-advances-on-biology-and-clinical-significance-of-demodex-mites-narrative-review-article
#8
REVIEW
Dorota Litwin, WenChieh Chen, Ewa Dzika, Joanna Korycińska
BACKGROUND: Demodex is a genus of mites living predominantly in mammalian pilosebaceous units. They are commonly detected in the skin of face, with increasing numbers in inflammatory lesions. Causation between Demodex mites and inflammatory diseases, such as rosacea, blepharitis, perioral and seborrhoeic dermatitis or chalazion, is controversially discussed. Clinical observations indicate a primary form of human Demodex infection. The aim of this review was to highlight the biological aspects of Demodex infestation and point out directions for the future research...
January 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/28711190/role-of-demodex-mite-infestation-in-rosacea-a-systematic-review-and-meta-analysis
#9
REVIEW
Yin-Shuo Chang, Yu-Chen Huang
BACKGROUND: The reported prevalence and degrees of Demodex mite infestation in rosacea vary widely. OBJECTIVE: We sought to conduct an evidence-based meta-analysis of the prevalence and degrees of Demodex mite infestation in patients with rosacea. METHODS: Systematic literature review and meta-analysis were conducted. Odds ratios for prevalence of infestation and standardized mean difference (SMD) for Demodex density in patients with rosacea were pooled...
September 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28695830/prevalence-and-density-of-demodex-folliculorum-and-demodex-brevis-acari-demodicidae-in-erzincan-province
#10
Engin Tilki, Erhan Zeytun, Salih Doğan
OBJECTIVE: This study aimed to determine the prevalence and density of Demodex folliculorum and D. brevis in Erzincan Province and the association between Demodex spp. and skin moisture, pH, and temperature. METHODS: The study included total 300 healthy participants without dermatological ailments and residing in Erzincan Province. Moisture, pH, and temperature of the cheek were measured, and the presence of mite was determined in samples from the cheek, nasolabial, and chin region using the standard superficial skin biopsy technique...
June 2017: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/28653460/dual-anti-inflammatory-and-anti-parasitic-action-of-topical-ivermectin-1-in-papulopustular-rosacea
#11
M Schaller, L Gonser, K Belge, C Braunsdorf, R Nordin, A Scheu, C Borelli
BACKGROUND: Recently, therapy of rosacea with inflammatory lesions (papulopustular) has improved substantially with the approval of topical ivermectin 1% cream. It is assumed to have a dual mode of action with anti-inflammatory capacities and anti-parasitic effects against Demodex, which however has not yet been demonstrated in vivo. AIM: To find scientific rationale for the dual anti-inflammatory and anti-parasitic mode of action of topical ivermectin 1% cream in patients with rosacea...
June 27, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28583218/demodex-canis-regulates-cholinergic-system-mediated-immunosuppressive-pathways-in-canine-demodicosis
#12
P Kumari, R Nigam, A Singh, U P Nakade, A Sharma, S K Garg, S K Singh
Demodex canis infestation in dogs remains one of the main challenges in veterinary dermatology. The exact pathogenesis of canine demodicosis is unknown but an aberration in immune status is considered very significant. No studies have underpinned the nexus between induction of demodicosis and neural immunosuppressive pathways so far. We have evaluated the involvement of cholinergic pathways in association with cytokines regulation as an insight into the immuno-pathogenesis of canine demodicosis in the present study...
June 6, 2017: Parasitology
https://www.readbyqxmd.com/read/28552438/high-prevalence-of-demodex-spp-infestation-among-patients-with-posterior-blepharitis-correlation-with-age-and-cylindrical-dandruff
#13
D López-Ponce, F Zuazo, C Cartes, D Salinas-Toro, C Pérez-Valenzuela, F Valenzuela, L Traipe-Castro, R O López-Solís
OBJECTIVE: To determine prevalence of Demodex spp. and infestation index (II) by the parasite among patients of different ages with blepharitis and to assess association with occurrence of cylindrical dandruff (CC). MATERIALS AND METHODS: Prospective study including patients diagnosed with posterior blepharitis between 2013 and 2015, without previous acaricide treatment, was conducted by Fundación Oftalmológica Los Andes (Chile). Four eyelashes were randomly extracted from each eyelid for parasite detection...
September 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28399378/adult-and-immature-stages-of-the-new-species-of-the-genus-demodex-acariformes-demodecidae-with-data-on-parasitism-topography-and-topical-specificity-of-demodecid-mites-in-the-yellow-necked-mouse-apodemus-flavicollis-rodentia-muridae
#14
Joanna N Izdebska, Leszek Rolbiecki, Sławomira Fryderyk, Łukasz Mierzyński
Demodex mollis n. sp. is described from the yellow-necked mouse, Apodemus flavicollis (Melchior, 1834), from Poland. It is a medium-sized demodecid mite (adult stages are, on average, 249 μm long) observed in the skin of the eyelid area. This new species is most similar to two other species occupying similar a microhabitat in hosts of the same genus-Demodex lacrimalis Lukoschus and Jongman, 1974 from Apodemus sylvaticus Linnaeus, 1758 and Demodex huttereri Mertens, Lukoschus and Nutting, 1983 from Apodemus agrarius (Pallas, 1771)-but it differs in the following features: the terminal palpi are equipped with 3 spines, including 1 large claw-like spine and 1 single spine; subgnathosomal setae (setae n) are situated on both sides of the anterior side of the pharyngeal bulb; claws on the leg tarsi are bifurcated and each is equipped with large subterminal spur and proximal pointed projection; the opisthosoma is soft and flexible; and the male aedeagus has a different shape and localization...
August 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28392639/demodex-mite-density-determinations-by-standardized-skin-surface-biopsy-and-direct-microscopic-examination-and-their-relations-with-clinical-types-and-distribution-patterns
#15
Chul Hyun Yun, Jeong Hwan Yun, Jin Ok Baek, Joo Young Roh, Jong Rok Lee
BACKGROUND: Demodicosis is a parasitic skin disease caused by Demodex mites, and the determination of mite density per square centimeter is important to diagnose demodicosis. Standardized skin surface biopsy (SSSB) and direct microscopic examination (DME) are commonly used to determine Demodex mites density (Dd). However, no study has previously compared these two methods with respect to clinical types and distribution patterns of demodicosis. OBJECTIVE: The aim of this study was to compare the value of SSSB and DME findings in reference to the clinical types and distribution patterns of demodicosis...
April 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28369843/the-effect-of-skin-moisture-ph-and-temperature-on-the-density-of-demodex-folliculorum-and-demodex-brevis-acari-demodicidae-in-students-and-staff-of-the-erzincan-university-turkey
#16
Erhan Zeytun, Engin Tilki, Salih Doğan, Kosta Yani Mumcuoğlu
BACKGROUND: The aim of this study was to determine the prevalence and density of Demodex folliculorum and Demodex brevis in students and staff of the Erzincan University, Turkey, and to define the influence of age, gender, educational level, and hygiene as well as skin moisture, pH, and temperature on the presence of Demodex mites. METHODS: Healthy people without apparent facial dermatoses from nine faculties and five vocational schools of the university were included in the study...
March 30, 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28347561/-the-value-of-reflectance-confocal-microscopy-in-detection-of-demodex-mites
#17
Y Harmelin, F Le Duff, T Passeron, J-P Lacour, P Bahadoran
No abstract text is available yet for this article.
March 24, 2017: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/28329621/facial-pigmentation-with-demodex-mite-a-mere-coincidence-or-an-association
#18
LETTER
Betul Sereflican, Bengu Tuman, Cetin Boran, Nadir Goksugu, Ali Haydar Parlak, Mualla Polat
Demodex mites may induce inflammatory cutaneous reactions such as papulopustular rosacea and demodex folliculitis; both may lead to post inflammatory pigmentation. A 59-year-old man presented with an asymptomatic, hyperpigmented plaque on his face. Histological and clinical findings displayed Riehl-like facial pigmentation. Multiple demodex mites at the follicular infundibulum in the biopsy material were remarkable. There are limited publications about demodex-associated pigmentation. We report this case to point out that various hyperpigmentation disorders may occur simultaneously with demodex mites...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329574/a-rare-clinical-manifestation-of-spinulate-demodicosis
#19
Funda Tamer, Evren Sarifakioglu, Ozge Mine Orenay
Demodicosis is a chronic skin disease caused by Demodex mites such as Demodex folliculorum and Demodex brevis. Demodex mites live in pilosebaceous units and they are regarded as a part of the normal skin flora. Nevertheless, it has been suggested that the presence of five or more mites per cm² by the standardized skin surface biopsy technique could be considered as pathogenic.
November 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28326184/unilateral-demodicidosis-of-face-mimicking-hansens-disease
#20
Deepak Vashisht, Jatinder Singh, Sukriti Baveja, Rohit Tiwari, Anuj Bhatnagar
Demodicosis is a common parasitic infection of the hair follicles and the pilosebaceous unit by the Demodex mites viz. Demodex folliculorum and Demodex brevis. Infection by this parasite is common among immunocompromised and elderly. We report a case of facial Demodicosis which presented like atypical rosacea with a gradually progressing swelling and redness on right side of face which was initially diagnosed as a case of Hansen's disease. Skin biopsy revealed follicular dilatation with presence of Demodex mite along with intense perifollicular lymphomononuclear infiltrate...
June 15, 2016: Dermatology Reports
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