Since the first cases of COVID-19 were documented in Wuhan, China in 2019, the world has
witnessed a devastating global pandemic, with more than 238 million cases, nearly 5 million …

Since the initial reports of a cluster of pneumonia cases of unidentified origin in Wuhan,
China, in December 2019, the novel coronavirus that causes this disease—severe acute …

Abstract The Omicron (B. 1.1. 529) variant of SARS-CoV-2 emerged in November 2021 and
is rapidly spreading among the human population. Although recent reports reveal that the …

Background The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) omicron
variant, designated as a variant of concern by the World Health Organization, carries …

ABSTRACT The novel SARS-CoV-2 Omicron variant (B. 1.1. 529), first found in early
November 2021, has sparked considerable global concern and it has> 50 mutations, many …

Coronavirus disease 2019 (COVID-19) is the second pandemic of the twenty-first century,
with over one-hundred million infections and over two million deaths to date. It is a novel …

Humans have witnessed three deadly pandemics so far in the twenty-first century which are
associated with novel coronaviruses: SARS, Middle East respiratory syndrome (MERS), and …

Since the first description of a coronavirus-related pneumonia outbreak in December 2019,
the virus SARS-CoV-2 that causes the infection/disease (COVID-19) has evolved into a …

Aims To examine the nurses' burnout and associated risk factors during the COVID‐19
pandemic. Design We followed the Cochrane criteria and the Preferred Reporting Items for …

Three major outbreaks of the coronavirus, a zoonotic virus known to cause respiratory
disease, have been reported since 2002, including SARS-CoV, MERS-CoV and the most …