Diaz Diaz JH JH Hypothesis: angiotensin-converting enzyme inhibitors and angiotensin receptor blockers may increase the risk of severe COVID-19 Hypothesis: angiotensin-converting enzyme inhibitors and angiotensin receptor blockers may increase the risk of severe COVID-19 J Travel Med J Travel Med 2020 2020 3 3 18 18 pii:taaa041 pii:taaa041. This evidence concerns the gene ACE and COVID-19.