Predictors of seropositivity to SARS-CoV-2 among employees at a large urban medical center.

Background: Before SARS-CoV-2 vaccination availability, medical center employees were at high risk of COVID-19. However, risk factors for SARS-CoV-2 infection in medical center employees, both healthcare and non-healthcare workers, are poorly understood.

Methods: From September-December 2020, free IgG antibody testing was offered to all employees at a large urban medical center.

COF-300 synthesis and colloidal stabilization with substituted benzoic acids.

Colloidal covalent organic framework (COF) synthesis enables morphological control of crystallite size and shape. Despite numerous examples of 2D COF colloids with various linkage chemistries, 3D imine-linked COF colloids are more challenging synthetic targets. Here we report a rapid (15 min-5 day) synthesis of hydrated COF-300 colloids ranging in length (251 nm-4.

Ice pack-induced perniosis: a rare and underrecognized association.

Perniosis, or chilblain, is characterized by skin lesions that occur as an abnormal reaction to exposure to cold and damp conditions. It can present as an idiopathic dermatosis or in association with an underlying connective tissue or autoimmune disease. Differentiation by histopathologic examination is controversial.

Concomitant fibrofolliculoma and trichodiscoma on the abdomen.

Fibrofolliculoma and trichodiscoma are adnexal tumors that arise from or around hair follicles and are two of the many characteristic features of Birt-Hogg-Dubé (BHD) syndrome. Fibrofolliculoma and other hair follicle hamartomas can be differentiated from their clinically indistinct counterparts (eg, trichodiscomas, trichoadenomas) by histologic and staining comparison. We report a rare case of a 54-year-old man who presented with a subcutaneous papule on the abdomen that was histologically proven to have features of both a solitary fibrofolliculoma and trichodiscoma.

Practical and Sustainable Teledermatology and Teledermatopathology: Specialty Care in Cameroon Africa.

Teledermatology is a rapidly expanding niche within telemedicine still in its infancy. It has become increasingly more feasible in recent years with the expansion of information and communication technologies. Here, the authors present the details of their collaboration and propose a model for constructing a teledermatology network.