Resumen:
We read with interest the paper from Millet et al. (2021), which discuss reports suggesting that high-altitude residence may be beneficial in the novel coronavirus disease (COVID-19). They conclude that no evidence-based knowledge is presently available on whether and how altitude/hypoxia may prevent, treat, or aggravate COVID-19. They suggest that the reported lower incidence and mortality of COVID-19 in high-altitude places observed by others (Stephens et al., 2021) remain to be confirmed. Stephens et al. (2021) study two groups: one living in counties located at altitudes less than 914 m and the other at altitudes higher than 2133 m...