Background There is disagreement about the level of asymptomatic severe acute respiratory
syndrome coronavirus 2 (SARS-CoV-2) infection. We conducted a living systematic review …

Background Asymptomatic SARS-CoV-2 infections are responsible for potentially significant
transmission of COVID-19. Worldwide, a number of studies were conducted to estimate the …

Importance Several studies were conducted to estimate the average incubation period of
COVID-19; however, the incubation period of COVID-19 caused by different SARS-CoV-2 …

Objectives Countries throughout the world are experiencing COVID-19 viral load in their
populations, leading to potential transmission and infectivity of asymptomatic COVID-19 …

Woolcott, Orison O., and Richard N. Bergman. Mortality attributed to COVID-19 in high-
altitude populations. High Alt Med Biol. 21: 409–416, 2020. Background: Since partial …

Background There is substantial disagreement about the level of asymptomatic severe acute
respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in a population. The …

Ortiz-Prado, Esteban, Raul Patricio Fernandez Naranjo, Eduardo Vasconez, Katherine
Simbaña-Rivera, Trigomar Correa-Sancho, Alex Lister, Manuel Calvopiña, and Ginés …

Background Multiple studies have attempted to elucidate the relationship between chronic
hypoxia and SARS-CoV-2 infection. It seems that high-altitude is associated with lower …

Coronavirus Disease 2019 (COVID-19) has created a global pandemic. Global
epidemiological results show that elderly men are susceptible to infection of COVID-19. The …

The current outbreak of Coronavirus disease 2019 (COVID-19) has become a health
emergency of international concern since last December 2019. At the same time, the …