RESUMO A angeíte congelada é tipo específico de vasculite retiniana rara e grave. Pode ser idiopática ou secundária à doença sistêmica. Relatamos um incomum caso com associação ao lúpus eritematoso sistêmico, sendo a angeíte congelada uma das manifestações do quadro. Uma jovem de 13 anos, previamente hígida, apresentou queixa de baixa visual importante bilateral. À fundoscopia foi evidenciado o aspecto de angeíte de vasos congelados em ambos os olhos. Extensa investigação etiológica foi realizada com diagnóstico confirmado de lúpus eritematoso sistêmico. Poucos casos foram descritos na literatura.

ABSTRACT Frosted branch angiitis is a rare and severe form of retinal vasculitis. It may be idiopathic or arise secondary to a systemic disease. We have reported here an unusually severe case of frosted branch angiitis in a previously healthy 13-year old girl who presented with significantly reduced vision in both eyes. In this case, frosted branch angiitis was one of the presentations of systemic lupus erythematosus. The characteristic patterns of frosted branch angiitis were observed on fundoscopy in both eyes. An extensive etiological study was conducted, whereby the diagnosis of systemic lupus erythematosus was confirmed. Only a few such cases have been reported so far in the literature.

ABSTRACT: Brevipalpus-transmitted viruses (BTV) are a taxonomically diverse group of plant viruses which severely affect a number of major crops. Members of the group can be sub-classified into cytoplasmic (BTV-C) or nuclear type (BTV-N) according to the accumulation sites of virions in the infected plant cells. Both types of BTV produce only local infections near the point of inoculation by viruliferous mites. Features of BTV-plant interactions such as the failure of systemic spread in their natural hosts are poorly understood. In this study we evaluated Arabidopsis thaliana, a model plant commonly used for the study of plant-virus interactions, as an alternative host for BTV. Infection of Arabidopsis with the BTV-N Coffee ringspot virus and Clerodendrum chlorotic spot virus, and the BTV-C Solanum violaefolium ringspot virus, were mediated by viruliferous Brevipalpus mites collected in the wild. Upon infestation, local lesions appeared in 7 to 10 days on leaves of, at least, 80 % of the assayed plants. Presence of viral particles and characteristic cytopathic effects were detected by transmission electron microscopy (TEM) and the viral identities confirmed by specific reverse-transcriptase polymerase chain reaction (RT-PCR) and further amplicon sequencing. The high infection rate and reproducibility of symptoms of the three different viruses assayed validate A. thaliana as a feasible alternative experimental host for BTV.