No abstract

Background The Coronavirus disease 2019 (COVID‐19) pandemic is having a major global impact, and the resultant response in the development of new diagnostics is unprecedented. The detection of antibodies against severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) has a role in managing the pandemic. We evaluated the feasibility of using SARS‐CoV‐2 peptide Kode Technology‐modified red cells (C19‐kodecytes) to develop an assay compatible with existing routine serologic platforms. Study Design and Methods A panel of eight unique red cells modified using Kode Technology function‐spacer‐lipid constructs and bearing short SARS‐CoV‐2 peptides was developed (C19‐kodecyte assay). Kodecytes were tested against undiluted expected antibody‐negative and ‐positive plasma samples in manual tube and three column agglutination technology (CAT) platforms. Parallel analysis with the same peptides in solid phase by enzyme immunoassays was performed. Evaluation samples included >120 expected negative blood donor samples and >140 COVID‐19 convalescent plasma samples, with independent serologic analysis from two centers. Results Specificity (negative reaction rate against expected negative samples) in three different CAT platforms against novel C19‐kodecytes was >91%, which correlated with published literature. Sensitivity (positive reaction rate against expected positive convalescent, PCR‐confirmed samples) ranged from 82% to 97% compared to 77% with the Abbott Architect SARS‐CoV‐2 IgG assay. Manual tube serology was less sensitive than CAT. Enzyme immunoassay results with some Kode Technology constructs also had high sensitivity. Conclusions C19‐kodecytes are viable for use as serologic reagent red cells for the detection of SARS‐CoV‐2 antibody with routine blood antibody screening equipment.

We describe a case of bilateral emphysematous pyelonephritis, in a diabetic female, that responded to medical therapy alone. Her complete improvement is documented radiologically. Emphysematous pyelonephritis, as a cause of serious infection in diabetic patients, is briefly reviewed.

Airway narrowing may masquerade as asthma. Congenital tracheal stenosis is rare and is associated with a high mortality rate. Complete tracheal rings presenting in adulthood are extremely rare, and we report the first case of long-segment pantracheal stenosis presenting in adulthood. Surgical treatment with tracheoplasty is difficult. A custom-made tracheostomy tube to stent the entire trachea is one management option. Tracheal stenosis should be excluded in patients with a chronic lack of response to therapy for asthma.

No abstract