Early data suggests the incidence of true anaphylaxis to the Pfizer-BioNTech COVID-19 vaccine is rare (11.1 cases per million vaccine doses). Anaphylaxis is more common in women and persons with a history of allergies, and symptoms typically appear within 30 minutes of injection.

A retrospective, observational, cohort study done to assess whether a diagnosis of a schizophrenia spectrum disorder, mood disorder, or anxiety disorder is associated with mortality in patients with COVID-19.

A randomized, multicenter, double-blind, placebo-controlled, phase 1/2a clinical trial to evaluate the safety, reactogenicity, and immunogenicity of Ad26.COV2.S - a recombinant, replication-incompetent adenovirus serotype 26 (Ad26) vector encoding a full-length and stabilized SARS-CoV-2 spike (S) protein

An observational cohort study performed to describe characteristics and outcomes of hematopoietic stem-cell transplantation (HSCT) recipients after developing COVID-19

A prospective, randomized, open-label trial performed to evaluate whether continuation of angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) is beneficial or harmful in patients who are admitted to hospital with COVID-19.

A cohort study done to comparatively examine differences in risk of clinical manifestations and death among people admitted to hospital with coronavirus disease 2019 (COVID-19) and seasonal influenza.

A phase 3 randomized, stratified, observer-blinded, placebo-controlled trial to to assess the safety and efficacy of the mRNA-1273 vaccine in preventing SARS-CoV-2 infection.

A randomized, multicenter, adaptive, double-blind, placebo-controlled trial to evaluate whether the combination of baricitinib plus remdesivir was superior to remdesivir alone.

A comparative study done to evaluate the fitted filtration efficiency (FFE) of various consumer-grade and improvised face masks, as well as several popular modifications of medical procedure masks that are intended to improve mask fit or comfort.

A case report describing two monozygotic twins with different clinical courses, despite having the same environment and genomic factors.