Comorbilidades y factores asociados en pacientes con alopecia areata / Comorbidities and associated factors in patients with alopecia areata i: en

Introducción: La alopecia areata en una enfermedad autoinmune caracterizada por la pérdida no cicatricial de pelo; puede ser catalogada como un problema estético, sin tener en cuenta que tiene alto impacto en la calidad de vida de quien la padece. Objetivo: Identificar las comorbilidades, el impacto psicosocial y los factores asociados en pacientes con alopecia areata. Métodos: Se realizó un estudio observacional, descriptivo y transversal de 50 pacientes con diagnóstico clínico de alopecia areata, atendidos en el Hospital General Docente Dr. Juan Bruno Zayas Alfonso de Santiago de Cuba, desde 2018 hasta 2020. Resultados: En la casuística prevalecieron los pacientes de 29-39 años de edad (46,0 %), el sexo masculino (58,0 %), el estrés y la ansiedad como factores emocionales (76,0 %), seguidos de los focos sépticos (40,0 %); el nivel de escolaridad de técnico medio (52,0 %), el estado civil acompañado (44,0 %) y el tiempo de evolución de la alopecia entre 4 y 12 meses (76,0 %). Conclusiones: Se evidenció que la mayoría de los pacientes presentaron algún episodio emocional o una crisis de ansiedad, previos al inicio de la alopecia areata.

Introduction: The alopecia areata in an autoimmune disease characterized by the non-cicatricial loss of hair; that can be classified as a cosmetic problem, without taking into account that has high impact in the life quality of the one who suffers from the disease. Objective: To identify the comorbidities, psychosocial impact and associated factors in patients with alopecia areata. Methods: An observational, descriptive and cross-sectional study of 50 patients with clinical diagnosis of alopecia areata was carried out, they were assisted in Dr. Juan Bruno Zayas Alfonso Teaching General Hospital in Santiago de Cuba, from 2018 to 2020. Results: In the case material there was a prevalence of the 29-39 years patients (46.0 %), the male sex (58.0 %), stress and anxiety as emotional factors (76.0 %), followed by the septic focus (40.0 %); the school level of technician (52.0 %), accompanied as marital status (44.0 %) and the time of evolution of the alopecia between 4 and 12 months (76.0 %). Conclusions: It was evidenced that most of the patients presented some emotional event or a crisis of anxiety before the beginning of the alopecia areata.

Efluvio telógeno y Covid-19 / Telogen effluvium and Covid-19

The first case of infection by the virus SARS-CoV-2 was reported in China in the late 2019. The disease caused by this virus was called COVID-19 and was declared as a global pandemic by World Health Organization in March 2020. Among the consequences caused by the virus, some dermatological pathologies have been reported, such as Telogen effluvium (TE). In this review we will address the relation between Telogen effluvium and COVID-19. Material and methods: All literature related to Telogen effluvium and COVID-19 was searched in PubMed. Results: Since the beginning of the pandemic, the number of patients diagnosed with TE has increased. This is explained on one hand by the infection itself of the virus, generating a proinflammatory and procoagulant answer that lead to TE. On the other hand, it can be explained due to the stress caused by the lockdowns and the psychological consequences of a global pandemic. Also, the therapies used to treat the infection may increase the severity of the TE. The relation between TE and Covid-19 is not totally clear yet, but it is important due to the great impact that generates in the lives of the patients. (AU)

Characteristics of telogen effluvium in COVID-19 in western Iran (2020)

Abstract Background: Although COVID-19 pandemic significantly induces mortality, many of the patients who recovered present other medical problems such as alopecias. Telogen effluvium is a common alopecia that is usually related to previous events such as acute febrile diseases, including COVID-19. Objective: To evaluate the characteristics of telogen effluvium in COVID-19. Method: This cross-sectional study was carried out on 526 patients with documented telogen effluvium that recovered from COVID-19. Demographic data, concurrent alopecia, associated diseases, and COVID-19 severity were recorded. Data were analyzed by appropriate statistical methods. Results: The mean age of the 526 patients (410 females, 116 males) was 30.97±9.592 years, with 7.65 ± 1.739 weeks of mean time of alopecia onset. Vitamin D deficiency (24.3%), androgenetic alopecia (78.2%), and grade III COVID-19 severity were the most common findings. Alopecia onset was significantly earlier in the younger age group, females, in hypothyroidism, and more severe coronavirus infection. Higher grade coronavirus infection was significantly seen in males, higher ages, earlier onset, and androgenic alopecia. Study limitations: Performing a single-center study and considering limited variables. Conclusion: Although Coronavirus 2 infection can be an important factor in telogen effluvium induction, other factors such as associated diseases, drug intake and emotional stress may also be involved. In the cases of early onset of alopecia, concomitant diseases such as hypothyroidism and severe coronavirus infection can occur, thus, the presence of various factors in telogen effluvium induction should be considered.

Evaluation of the level of serum Interleukins (IL-2, IL-4, IL-15 andIL-17) and its relationship with disease severity in patients with alopecia areata

Abstract Background: Alopecia areata (AA) is a hair disease that causes hair loss without scarring. The etiopathogenesis of AA has not been fully understood yet. Objective: To determine serum interleukin levels (IL-2, IL-4, IL-15, and IL-17) in patients diagnosed with alopecia areata and to investigate the relationship of IL levels with the duration and severity of alopecia areata and the response to tofacitinib therapy. Methods: Patients (≥16 years old) diagnosed with alopecia areata and healthy individuals as a control group was enrolled. Baseline serum interleukin levels of the patients and controls were measured. In the patient group receiving tofacitinib therapy, serum interleukin levels were measured again after 6 months. Disease severity for alopecia areata was assessed using the Severity of Alopecia Tool. Results: Sixty-one AA patients and 30 healthy individuals were included; they were comparable regarding age and sex. The mean disease duration for AA was 7 ± 6 years and the baseline mean Severity of Alopecia Tool score was 71 ± 30 (range, 20-100). Baseline IL-2, IL-4 and IL-15 levels were significantly higher in the patient group than those in the control group (p < 0.001 for each). No significant correlation was found between the baseline interleukin levels and either disease duration or disease severity (baseline Severity of Alopecia Tool score). Among the patients receiving tofacitinib (n = 22), all interleukin levels significantly decreased after treatment. However, no significant relationship between the change in interleukin levels and the change in the Severity of Alopecia Tool scores was observed after tofacitinib treatment. Study limitations: This is a monocentric study conducted in a single university hospital. Conclusion: High interleukin levels in alopecia areata patients and the significant decrease with treatment support the idea that interleukins have a role in pathogenesis. Nevertheless, no relationship could be demonstrated between IL levels and disease duration or severity.

Acute telogen effluvium triad after resolution

Abstract Five cases of telogen effluvium undergoing resolution are shown, with the presence of frontal, bitemporal, and occipital hair regrowth. Diagnosing acute telogen effluvium after the end of the active phase can be challenging, especially when the pull test is negative. The differential diagnosis includes alopecia areata and traction alopecia. Clinical signs of hair regrowth after telogen effluvium can help in the diagnosis. The frontal and temporal areas have more telogen hairs and are more affected. On the occipital area, hairs seem to have the same behavior. The acute telogen effluvium triad during resolution is proposed: frontal fringe, temporal recess and occipital fringe.

Moniletrix of the scalp from almost normal aspect to total alopecia: variable intrafamilial expressiveness

Abstract Monilethrix is a rare defect of the hair shaft, with most cases showing an autosomal dominant pattern of inheritance and variable clinical expression. It is characterized by hypotrichosis secondary to hair fragility. The diagnosis is made through trichoscopy, detecting typical findings such as periodic narrowing at regular intervals, giving the hair the appearance of beads in a rosary. This article reports the case of six members of a family diagnosed with monilethrix with alopecia of varying degrees.

Trichotillomania masked by diffuse Alopecia Areata: A case report

@#An 11-year-old girl previously treated for tinea capitis presented a 3-month history of continuous decrease in hair density on the vertex, frontal, and parieto-temporal areas of the scalp. Hair pull test was negative. Trichoscopic findings showed black dots, micro-exclamation point hairs, regrowing vellus hair, and zigzag hairs. Histopathology showed CD3+ peribulbar lymphocytic infiltrates and occasional eosinophils around the anagen hair follicle consistent with a non-scarring alopecia. A diagnosis of diffuse alopecia areata was made. Patient was given methylprednisolone (0.5 mg/kg/day) for 2 weeks and noted marked increase in hair density except on focal areas of the scalp. Patient eventually admitted to occasional hair pulling. Trichoscopy revealed trichoptilosis, V-sign, tulip hairs, and multiple broken hairs of varying length while a second biopsy showed trichomalacia and pigment casts consistent with trichotillomania. In this case, where co-existence of alopecia areata and trichotillomania is considered to be uncommon, trichoscopy proved to be an important tool in differentiating hair disorders with similar presentation. Knowing key features of hair diseases can help elucidate the diagnosis when presented with an atypical case.

A Prospective Case Control Study Comparing Serum Vitamin D Levels in Patients with and without Alopecia Areata

Background@#Alopecia areata (AA) is the most common cause of non-scarring alopecia.1 Many studies reported decreased serum vitamin D levels in patients with AA compared to healthy subjects.1-8 This study aimed to assess the prevalence of vitamin D deficiency in patients with AA compared to patients without AA. The secondary objective was to determine the correlation between vitamin D deficiency with disease severity and the pattern of AA.@*Methods@#This research was a case control study involving patients with AA from the dermatology clinic in Hospital Raja Permaisuri Bainun. All the subjects and controls were age, sex and Fitzpatrick skin type matched. Serum vitamin D (25-hydroxyvitamin D) (25 OHD) levels were obtained and analysed by the chemiluminescence immunoassay method. AA severity was assessed by Severity of Alopecia Tool (SALT) score.@*Results@#A total of 50 subjects, out of which 25 patients with AA and 25 controls, were recruited. The median serum vitamin D level was 54.15 nmol/L (IQR 139) in the AA group and 53.79 nmol/L (IQR 64.47) in the control group. However, the difference was not statistically significant (p=0.823). The prevalence of vitamin D deficiency was higher in the AA group (12%) compared to the control group (4%), but it was not statistically significant (p=0.304). There was no statistical significance in serum vitamin D levels with disease severity (SALT score) (p=0.171) and pattern of AA (p=0.657).@*Conclusion@#There was no statistical difference in the prevalence of vitamin D deficiency between patients with and without AA. There was no correlation between serum vitamin D levels with disease severity and pattern of AA. Further studies using a larger sample size is needed to justify measuring serum vitamin D levels in patients with AA.

Analysis of genetic variant in a case of sporadic neurofibromatosis type I with alopecia areata and vitiligo / 中华医学遗传学杂志

OBJECTIVE@#To explore the genetic basis for a patient with clinically suspected neurofibromatosis type I, alopecia areata and vitiligo.@*METHODS@#Variant of the NF1 gene was detected by chip capture and high-throughput sequencing. Candidate variant was verified by Sanger sequencing of the family trio.@*RESULTS@#The patient was found to harbor a novel missense c.1885G>A (p.Gly629Arg) variant of the NF1 gene, for which neither parent was carrier. The variant was not recorded in the public database. Based on the guidelines for genetic variation of the American College of Medical Genetics and Genomics, the c.1885G>A missense variant was predicted to be pathogenic (PS1+PS2+PM2+PP3+PP4).@*CONCLUSION@#The c.1885G>A missense variant probably underlay the disease in this child. Above finding has enriched the spectrum of the NF1 gene variants.

Manifestaciones cutáneas secundarias a la pandemia COVID-19. Presentación de un caso / Cutaneous manifestations secondary to the COVID-19 pandemic. Case presentation

Introducción: Las manifestaciones cutáneas primarias de la infección por el SARS-CoV-2 se agrupan en cinco patrones clínicos dermatológicos. Sin embargo, las implicaciones de la pandemia COVID-19 en cuanto a afecciones de la piel también incluyen el empeoramiento de enfermedades cutáneas preexistentes, el aumento en la incidencia de dermatosis relacionadas con el estrés y otras relacionadas con factores físico-químicos. Objetivo: Presentar un paciente con herpes simple ocular y alopecia areata de la barba como manifestaciones cutáneas secundarias a la pandemia COVID-19. Presentación del caso: Paciente masculino, 22 años de edad, con antecedentes patológicos personales de salud aparente, estudiante de Medicina, que se encuentra realizando las labores de pesquisa activa de sintomáticos respiratorios, como apoyo al enfrentamiento a la COVID-19. Se diagnostica, aproximadamente 8 semanas después de diagnosticado el primer caso de la COVID-19 en Cuba, primoinfección de herpes simple tipo 1 ocular, con recidiva 15 días después, así como alopecia areata de la barba en placa única. Conclusiones: El herpes simple y la alopecia areata constituyen manifestaciones cutáneas secundarias a la pandemia COVID-19, debido a que las modificaciones en el estilo de vida que esta ha provocado, pueden ser el factor desencadenante de estas dermatosis relacionadas con el estrés; ante lo cual el personal de salud se encuentra más vulnerable que el resto de la población(AU)

Introduction: The primary cutaneous manifestations of SARS-CoV-2 infection are grouped into five clinical dermatologic patterns. However, the implications of the COVID-19 pandemic in terms of skin conditions also include a worsening of pre-existing skin diseases, an increase in the incidence of stress-related dermatoses and others related to physical-chemical factors. Objective: To present a patient with ocular herpes simplex and alopecia areata of the beard as secondary cutaneous manifestations to the COVID-19 pandemic. Case presentation: Twenty-two-year-old male patient, medical student, with personal pathological history of apparent health who is conducting the active investigation of respiratory symptoms in support of the confrontation with COVID-19. Primary ocular infection with herpes simplex virus type 1 with recurrence 15 days later as well as alopecia areata of the beard in single plaque were diagnosed approximately 8 weeks after the first case of COVID-19 was diagnosed in Cuba. Conclusions: Herpes simplex and alopecia areata are skin manifestations secondary to the COVID-19 pandemic. The changes in lifestyle that this disease has caused may be the triggering factor for these stress-related dermatoses to which health care personnel are more vulnerable than the rest of the population(AU)

Consensus on the treatment of alopecia areata - Brazilian Society of Dermatology

Abstract Background: Alopecia areata is a highly frequent disease with an impact on quality of life and several treatment options with little clinical confirmatory evidence. Objective: To disseminate the recommendations of Brazilian dermatologists with expertise in the treatment of alopecia areata. Methods: Eight specialists with expertise in alopecia areata from different university centers were appointed by the Brazilian Society of Dermatology to reach a consensus on its treatment. Based on the adapted DELPHI methodology, the relevant elements were considered; then, an analysis of recent literature was carried out and the consensus was written down. Consensus on the management of alopecia areata was defined with the approval of at least 70% of the panel. Results/Conclusions: Intralesional injectable corticotherapy was considered the first option for localized disease in adults. In extensive cases with signs of activity, systemic corticosteroid therapy should be considered and can be used together with immunosuppressants (corticosteroid-sparing agents). The use of an immunosensitizer (diphencyprone) is an option for stable long-term cases. Evaluation of side effects is as important as the rate of hair regrowth.

Reporte de manejo exitoso con simvastatina y ezetimibe en alopecia areata / A report of successful management with simvastatin plus ezetimibe in alopecia areata

La alopecia areata es un tipo común de alopecia no cicatricial. Aunque la patogénesis exacta permanece sin dilucidar, se piensa que la alopecia areata tiene una etiología multifactorial en donde se interrelacionan predisposición genética y factores ambientales. En pacientes susceptibles, se han documentado que el estrés, infecciones y microtraumas disminuyen las citoquinas inmunosupresoras que normalmente mantienen el privilegio inmune del folículo piloso. Actualmente no hay terapia curativa para la alopecia areata, aunque ciertos tratamientos pueden inducir el crecimiento del cabello en un porcentaje de pacientes. Se postula que la simvastatina restablece el privilegio inmune y ezetimibe aportaría un efecto inmunomodulador y antiinflamatorio. Se presenta el caso de una mujer de 23 años con alopecia areata, exitosamente tratada con simvastatina y ezetimibe.

Alopecia areata is a common type of non-scarring alo¬pecia. Although the exact pathogenesis remains elusive, alopecia areata is thought to have a multifactorial etiology described as an interplay of genetic predisposition and environmental exposures. In patients with genetic susceptibility, stress, infection, and microtrauma have been documented to decrease immunosuppressive cytokines that generally maintain the hair follicle's immune privilege. There is currently no curative therapy for alopecia areata, although some treatments can induce hair growth in a percentage of patients. It has been postulated that simvastatin reestablishes the immune privilege, and ezetimibe would provide an immunomodulatory and anti-inflammatory effect. We report a case of a 23 years-old woman with alopecia areata successfully treated with simvastatin/ezetimibe.

Alopecia reversible secundaria a metilfenidato OROS / Reversible Alopecia Secondary to OROS Methylphenidate

RESUMEN Introducción: El TDAH tiene una prevalencia del 1-4% de la población escolar española. Su tratamiento se realiza con derivados anfetamínicos y, recientemente, con fármacos no esti mulantes; los estudios realizados no han encontrado diferencias de eficacia. Caso clínico: Niña de 7 arios llegó derivada desde neurología por retraso en el aprendizaje y trastornos de conducta. Orientada como TDAH, se inició tratamiento con metilfenidato de liberación inmediata y posteriormente con la fórmula OROS; apareció alopecia areata y se retiró el tratamiento. Tras la reintroducción de metilfenidato de liberación modificada 30:70, se consiguió controlar los síntomas sin que apareciera alopecia. Discusión: Hay antecedentes publicados de 2 casos de alopecia areata con metilfenidato OROS, que se resolvieron tras el aumento de dosis del fármaco, aunque no se conoce clara mente el motivo de este suceso. No hay consenso sobre el uso prioritario de la fórmula de liberación inmediata o la fórmula OROS del metilfenidato.

ABSTRACT Introduction: Attention deficit hyperactivity disorder has a prevalence of 1-4% of the Spanish school population. Its treatment consists of giving amphetamine derivatives and, recently, non-stimulant drugs, without finding any differences in efficacy in the studies performed. Clinical case: A 7-year-old girl was referred from neurology due to learning delay and behaviour disorders. Diagnosed as likely ADHD, treatment was started with immediate release methylphenidate, and later with an osmotic release oral system (OROS) methylphenidate. When alopecia areata appeared, this treatment was withdrawn. After the re-introduction of modified release methylphenidate 30:70, symptom control was achieved without the appearance of alopecia. Discussion: There is a published history of two cases of alopecia areata with OROS methylp henidate that resolved after increasing the dose of the drug without clearly knowing the reason for this event. There is no consensus on the priority use of the immediate release formula or the OROS methylphenidate.

Ischemia-modified albumin as a possible marker of oxidative stress in patients with telogen effluvium

Abstract Background Telogen effluvium is the most common form of non-scarring alopecia characterized by diffuse hair loss. Ischemia-modified albumin is a marker of oxidative stress and inflammation. Objective The aim of this study was to compare the levels of ischemia-modified albumin of telogen effluvium patients with healthy controls. Methods Ninety-one patients diagnosed with telogen effluvium and 35 healthy volunteers were included in the study. Serum ischemia-modified albumin level was determined by a fast-colorimetric method, and albumin cobalt binding test. The results were evaluated statistically. Results There was no statistically significant difference between the serum albumin values of patient and control groups (p = 0.739). Serum ischemia-modified albumin values were significantly higher in the patients with telogen effluvium than healthy controls (p < 0.001). Study limitations Body mass index values of the patient and control groups could not be calculated. Conclusions To the best of the authors' knowledge, this is the first clinical study to investigate the role of oxidative stress in the pathogenesis of telogen effluvium using ischemia-modified albumin as a biomarker. Based on the results of the present study, it can be considered that oxidative stress plays an important role in the pathogenesis of telogen effluvium. There is a need for further studies to support the results of this study, to demonstrate the possible effects of oxidative stress, and to investigate the other oxidative stress markers in the pathogenesis of telogen effluvium.

CTLA4 +49AG (rs231775) and CT60 (rs3087243) gene variants are not associated with alopecia areata in a Mexican population from Monterrey Mexico

Abstract Background: Alopecia areata is an autoimmune disease that produces non-scarring hair loss around the body. Gene variants of the cytotoxic T-lymphocyte antigen 4 (CTLA4) gene, a negative regulator of T-cell response, have been associated with a predisposition to autoimmune diseases in different populations; however, the involvement of these genetic variants in the development of AA is controversial. Objective: The present study evaluated the potential association of two CTLA4 gene variants with alopecia areata in a Mexican population. Methods: We genotyped +49AG (rs231775) and CT60 (rs3087243) variants in 50 AA patients and 100 healthy control participants through PCR-RFLP. Results: No statistical difference was observed for either of the gene variants regarding allele or genotype frequencies between AA patients and the controls when the parameters of family/personal history of autoimmune diseases or gender were considered (p > 0.05). Study limitations: Small sample size of patients and the data were obtained from Northeast Mexico population. Conclusion: The genetic variants rs231775 and rs3087243 of the CTLA4 gene are not a risk factor for the development of alopecia areata in the analyzed Mexican population.

Alopecia areata y vitamina D sérica en pacientes iraquíes: un estudio de casos y controles / Alopecia Areata And Serum Vitamin D in Iraqi Patients: a case-control study

Background: Alopecia areata (AA) is a typical hair issue, which may have obliterating mental and social outcomes and is portrayed by the nearness of nonscarring alopecia. Objective: This examination has targets to assess the serum nutrient D levels , with AA; contrast the outcome and clearly sound control; and confirm relationship between AA types and serum nutrient D levels. Patients Also Methods: the examine might have been led clinched alongside Tikrit educating healing facility throughout those time starting with June 2019 of the limit for January 2020. Irrefutably the quantity of subjects associated with the assessment was ninety individuals isolated in two social events; the patients bundle were forty five the people who whimper of AA while the resulting gathering including a forty five age and sex-made solid volunteers were picked as a benchmark gathering. The degree and movement of the alopecia were noted and the patients were meticulously broke down for signs of various ailments. Research center assessments were led to patients and also to those control population, these included serum vitamin D levels were measured as 25-hydroxyvitamin D {25(OH)D} using a chemiluminescence microparticle immunoassay. Blood models were gotten starting with patients and control subjects after totally taught consent was gotten. Results : An essential complexity may have been found for serum 25-OH Vit D levels between patients other than controls. Vitamin D sufficiency were more common in controls than in patients. Serum Vitamin D was deficient in both cases and controls group; but, the deficiency was significantly more throughout AA group (35. 6%) compared to the handle group (11. 1%). Among the list patients gathering, levels associated with nutrient D were totally higher in guys in contrast with females. Conclusions: AA might be related with nutrient D deficiency as mean degrees of nutrient D of patients were seen as fundamentally lower than typical sound controls.

Idiopathic seasonal alopecia in horse: case report / Alopecia sazonal idiopática em equino: relato de caso

This report describes the first case of idiopathic seasonal alopecia in a horse in Brazil. The disease is of unknown etiology, characterized by alopecic processes in the thoracic and lateral abdominal regions, in a bilaterally symmetrical way. An eight-year-old male grade horse was treated presenting hair loss in a bilaterally symmetrical manner in the arm and abdomen areas, without any other associated clinical signs. The areas with alopecia showed no pruritus, inflammation or scaling. On the epidermis, the histological evaluation presented irregular hyperplasia, hyperpigmentation, compact orthokeratosis, edema and an inflammatory infiltrate. The hair follicles were active and containing hair shaft. The case was monitored with photographic records for two consecutive years (2012 to 2014), in which the hair fall occurred at the end of autumn with spontaneous hair growth in the middle of the summer. The diagnosis was based on the history, histopathology and photographic follow-up performed. Although mentioned in the literature, this is the first clinical and pathological description of such disorder affecting an equine in Brazil.(AU)

Relata-se o primeiro caso de alopecia sazonal idiopática em um equino no Brasil, doença de etiologia desconhecida, caracterizada por processos alopécicos, nas regiões torácicas e abdominais laterais, de forma simétrica bilateralmente. Um equino mestiço, macho, de oito anos de idade, foi atendido sob queixa de perda dos pelos em regiões do tórax e do abdômen, simétrica bilateralmente, sem qualquer outro sinal clínico associado. As regiões alopécicas não apresentavam prurido, inflamação nem descamação. A avaliação histológica revelou, na epiderme, hiperplasia irregular, hiperpigmentação e ortoqueratose compacta, edema e infiltrado inflamatório. Os folículos pilosos estavam ativos e contendo hastes de pelos. O caso foi acompanhado com registros fotográficos durante dois anos consecutivos (2012 a 2014), com a queda do pelo acontecendo no final do outono e com retorno espontâneo em meados do verão. O diagnóstico baseou-se no histórico, na histopatologia e no acompanhamento fotográfico. Mesmo sendo mencionada na literatura, esta é a primeira descrição clínico-patológica de tal distúrbio acometendo um equino no Brasil.(AU)