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Demodex mite

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https://www.readbyqxmd.com/read/29426737/-demodex-genus-colonizing-parasites-of-healthy-people-or-mites-associated-with-ocular-pathology
#1
Florencia Mongi, Laura Laconte, Rodolfo D Casero
Demodex folliculorum and Demodex brevis are mites that are responsible for human demodicosis affecting skin and frequently linked to ocular diseasess. The aim of this work was to determine the association between Demodex sp. and eyelid and eyelash diseases and to establish the predisposing factors for acquiring this parasitic disease. Eyelashes from symptomatic and asymptomatic patients (n=72) between 9 and 82 years old were analyzed, where 53% were positive for Demodex sp., of which 66% manifested ocular symptoms and pathologies, blepharitis and dry eye being prevalent...
February 6, 2018: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/29380184/ocular-demodex-folliculorum-prevalence-and-associated-symptoms-in-an-irish-population
#2
Orla Murphy, Veronica O'Dwyer, Aoife Lloyd-McKernan
PURPOSE: To investigate the prevalence of ocular Demodex folliculorum (DF) in an Irish population. To validate a modified Ocular Surface Disease Index questionnaire and employ it to evaluate the relationship between dry eye symptoms and the presence of DF. METHODS: One hundred and fifty-six subjects were enrolled in an epidemiological cross-sectional prevalence study. Each subject completed a novel questionnaire on ocular symptoms and was assessed for the presence of DF...
January 29, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29364436/investigation-of-demodex-folliculorum-frequency-in-patients-with-polycystic-ovary-syndrome
#3
Ayla Eser, Seval Erpolat, Ikbal Kaygusuz, Hatice Balci, Aydin Kosus
BACKGROUND: Background: Demodex mites are acari that reside in the pilosebaceous unit of the skin and have been associated with skin disorders. OBJECTIVE: The objective of this study was to investigate the prevalence of Demodex folliculorum (D. folliculorum) mites in polycystic ovary syndrome patients as well as to examine the relationship between Demodex infestation and the presence of acne and oily or dry skin types in polycystic ovary syndrome patients. METHODS: 41 polycystic ovary syndrome patients and 47 non-polycystic ovary syndrome control subjects were enrolled in the study...
November 2017: Anais Brasileiros de Dermatologia
https://www.readbyqxmd.com/read/29283119/demodex-and-rosacea-is-there-a-relationship
#4
Diana Gonzalez-Hinojosa, Alejandro Jaime-Villalonga, Gustavo Aguilar-Montes, Lorena Lammoglia-Ordiales
PURPOSE: The objective of the study is to compare the frequency of Demodex on the eyelash follicle of patients with rosacea and referents without rosacea or ophthalmological disorders. METHODS: This is a comparative, open, observational, and cross-sectional study that included 41 patients diagnosed with rosacea and 41 referents without rosacea diagnosis or ophthalmic alterations. The individuals underwent a slit-lamp examination in which two eyelashes per eyelid were removed with fine forceps...
January 2018: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29194776/endosymbiosis-and-its-significance-in-dermatology
#5
REVIEW
K Kubiak, H Sielawa, W Chen, E Dzika
Proposed at the beginning of the twentieth century to explain the origin of eukaryotic organelles from prokaryotes, endosymbiosis is now medically defined by various interaction patterns between microorganisms and their residing hosts, best exemplified by the bacterial endosymbiont Wolbachia identified in arthropods and filarial nematodes, which can influence normal development, reproduction, survival and transmission of the hosts. Based on the transmission modes, vertical or horizontal, and the function of the endosymbionts, the host-symbiont dependence can be divided into primary or secondary...
December 1, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29089049/efficacy-of-lotilaner-credelio%C3%A2-a-novel-oral-isoxazoline-against-naturally-occurring-mange-mite-infestations-in-dogs-caused-by-demodex-spp
#6
Daniel E Snyder, Scott Wiseman, Julian E Liebenberg
BACKGROUND: The oral systemic efficacy of lotilaner (Credelio™, Elanco) was evaluated against Demodex spp. in naturally infested dogs with generalized demodicosis. METHODS: In this study, 10 dogs with clinical signs of generalized demodicosis and positive for Demodex spp. mites based on skin scrapings were assigned to a single group orally treated with lotilaner (minimum dose of 20 mg/kg) on Days 0, 28 and 56. RESULTS: For lotilaner-treated dogs, pre-treatment mite counts based on skin scrapings performed at five different sites were reduced by > 99...
November 1, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29066489/demodex-as-a-delivery-vector-for-topical-targeted-medications-in-the-skin-for-early-melanoma-and-non-melanoma-skin-cancer
#7
Stephen L Strobel
The potential utilization of Demodex mites as delivery vectors for cytotoxic medications directed to early skin cancer is proposed. Potential benefits, proof of concept, and limitations are discussed.
September 2017: Annals of Clinical and Laboratory Science
https://www.readbyqxmd.com/read/29055903/significant-correlation-between-meibomian-gland-dysfunction-and-keratitis-in-young-patients-with-demodex-brevis-infestation
#8
Lingyi Liang, Yan Liu, Xiaohu Ding, Hongmin Ke, Chuan Chen, Scheffer C G Tseng
AIMS: To report the clinical characteristics and correlation between meibomian gland dysfunction (MGD) and keratitis in young patients with ocular demodicosis. METHODS: Observational case series of 60 patients younger than 35 years with ocular demodicosis, of which the diagnosis was based on microscopic counting of Demodex folliculorum and D. brevis of epilated lashes. Severity of keratitis and MGD was graded by photography and meibography, respectively, in a masked fashion...
October 21, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29054722/the-eyelids-and-tear-film-in-contact-lens-discomfort
#9
Jaya Sowjanya Siddireddy, Ajay Kumar Vijay, Jacqueline Tan, Mark Willcox
PURPOSE: To investigate characteristics of the eyelid margins, meibomian glands and the tear film of contact lens wearers, and to determine whether these characteristics were related to symptoms of contact lens discomfort. METHODS: A cross sectional study was performed on thirty existing daily wear soft contact lens wearers (6 male; 24 female) with median age of 23 years (range 18-41). Eyelid signs and tear film characteristics were evaluated during a single visit and subjects completed the contact lens and dry eye questionnaire (CLDEQ-8) to evaluate ocular discomfort...
October 17, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29035242/the-effect-of-skin-sebum-ph-and-moisture-on-demodex-infestation-in-acne-vulgaris-and-rosacea-patients
#10
Nergiz Turan, Yelda Kapıcıoğlu, Gülbahar Saraç
OBJECTIVE: Acne vulgaris is an inflammatory disease involving the pilosebaceous unit. Rosacea is a chronic inflammatory skin disease that affects the face in particular. This study aimed to determine if skin sebum, pH, and moisture affect the number of Demodex spp. in acne vulgaris and rosacea patients. METHODS: This study focused on 30 patients each with acne vulgaris and rosacea. As a control group, 60 healthy individuals were included. RESULTS: In acne vulgaris patients, when compared to those with Demodex mite more than 5 /cm2 in each area, less than 5/cm2 were found to be oily, acidic, dry or very dry...
September 2017: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/28940244/demodicosis-in-two-patients-with-a-previous-history-of-langerhans-cell-histiocytosis
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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