Importance A comprehensive understanding of the benefits of COVID-19 vaccination requires
consideration of disease attenuation, determined as whether people who develop COVID-…

Objectives To characterize the clinical severity of covid-19 associated with the alpha, delta,
and omicron SARS-CoV-2 variants among adults admitted to hospital and to compare the …

Background Whether video laryngoscopy as compared with direct laryngoscopy increases
the likelihood of successful tracheal intubation on the first attempt among critically ill adults is …

Importance Data on the efficacy of hydroxychloroquine for the treatment of coronavirus disease
2019 (COVID-19) are needed. Objective To determine whether hydroxychloroquine is an …

This study examined relationships among individual demographics, environmental features
(eg, fast food outlet density, park land use) of residential neighborhoods and activity spaces, …

Pottery was a hunter-gatherer innovation that first emerged in East Asia between 20,000
and 12,000 calibrated years before present 1 , 2 (cal bp), towards the end of the Late …

Background: As SARS-CoV-2 vaccination coverage increases in the United States (US), there
is a need to understand the real-world effectiveness against severe Covid-19 and among …

Tobacco smoke and nicotine exposure during prenatal and postnatal life can impair lung
development, alter the immune response to viral infections, and increase the prevalence of …

Objective To compare the effectiveness of a primary covid-19 vaccine series plus booster
doses with a primary series alone for the prevention of hospital admission with omicron related …

Importance For critically ill adults undergoing emergency tracheal intubation, failure to
intubate the trachea on the first attempt occurs in up to 20% of cases and is associated with …