We describe 2 cases of coronavirus disease in patients with mild upper respiratory symptoms. Both patients worked on a cruise ship quarantined off the coast of Japan. One patient had persistent, low-grade upper respiratory tract symptoms without fever. The other patient had rapid symptom cessation but persistent viral RNA detection.
Keywords: COVID-19; Japan; PCR; SARS-CoV-2; coronavirus; cruise ship; global health; respiratory infections; severe acute respiratory syndrome coronavirus 2; travelers health; viruses.