Objective: to verify in the scientific literature the symptomatic manifestations of COVID-19 in adults. Method: a systematic review carried out in the Scopus, Web of Science and PubMed databases with studies published from December 1, 2019 to April 21, 2020, in order to answer the guiding question: “What are the symptomatic manifestations caused by COVID-19 in adults?" using the keywords: "Symptoms", "Clinical ...