[Quadruple negative SARS-CoV-2-PCR: still COVID-19 pneumonia!].

Medical History And Clinical Findings:  A 78-year-old man fell ill with weakness, coughing and fever 19 days after a cruise in early April 2020 and was admitted 4 days later with increasing shortness of breath.

Examination And Diagnosis:  On admission, the patient had subfebrile temperatures, exercise dyspnea, and right-basal rales. CRP was moderately elevated and oxygen saturation was slightly reduced.