Article Correctness Is Author's Responsibility: COVID-19 found in sputum and feces samples after pharyngeal swabs are negative March 30, 2020 Author: Neuroscience News Category: American College of PhysiciansThe article below may contain offensive and/or incorrect content. COVID-19 was found in sputum up to 39 days, and feces up to 13 days after pharyngeal swabs were negative in recovered patients.