Initial reports5-8 have called attention to the potential overrepresentation of hypertension among patients with Covid-19. In the largest of several case series from China that have been released during the Covid-19 pandemic (Table S1 in the Supplementary Appendix, available with the full text of this article at NEJM.org), hypertension was the most frequent coexisting condition in 1099 patients, with an estimated prevalence of 15%9; however, this estimate appears to be lower than the estimated prevalence of hypertension seen with other viral infections10 and in the general population in China.11,12