The COVID-19 pandemic proceeds in waves, with variable characteristics of the clinical
picture resulting from the evolution of the SARS-CoV-2 virus. This study aimed to compare …

Background: Coronavirus disease is a pandemic that has disrupted many human lives,
threatening people's physical and mental health. Each pandemic wave struck in different …

This study aimed to compare the clinical picture of COVID-19 in the initial and later period of
Omicron dominance and to identify populations still at risk. A retrospective comparison of the …

Objectives: There are no comparative studies between patients belonging to the first and
second waves of the SARS-CoV-2 pandemic, the virus triggering coronavirus disease 2019 …

New SARS-CoV-2 may pose problems in controlling the COVID-19 pandemic for public
health. We aimed to assess and compare the symptoms and severity of cases due to the …

Background: Since preliminary evidence suggests that the new SARS-CoV-2 Omicron (B.
1.1. 529) variant may cause different symptoms and trigger outbreaks associated with less …

Since the emergence of the Coronavirus disease 2019 (COVID-19) in Dec 2019, the world
continues to be facing a fierce pandemic characterized by multiple waves at various paces …

(1) Background: Different clinical presentations in COVID-19 are described to date, from mild
to severe cases. This study aims to identify different clinical phenotypes in COVID-19 …

Importance The SARS-CoV-2 Omicron subvariant, BA. 2, may be less severe than previous
variants; however, confounding factors make interpreting the intrinsic severity challenging …

The rapid spread of SARS-CoV-2 variants in the global population is indicative of the
development of selective advantages in emerging virus strains. Here, we performed a case …