IL6 and acute kidney injury: AKI was a negative prognostic factor for COVID-19 infection, i.e., it increased the mortality [OR = 5.246 (95% CI: 1.279–21.508); p = 0.02], as was not being treated with remdesevir [OR = 4.319 (95% CI: 1.104–16.904); p = 0.04] and having increased levels of IL-6 [OR = 1.023 (95% CI: 1.002–1.045); p = 0.03].