The objective of this study is to quantitatively assess viral shedding in COVID-19 infected elderly patients who survived infection in order to provide an overview of the evolution of nasopharyngeal swab SARS-CoV-2 real-time reverse transcriptase-polymerase chain reaction (RT-PCR) test results with the Cycle threshold value of the RT-PCR test.. The investigatrors analyze nasopharyngeal RT-PCR at diagnosis. After one month since the date of onset symptoms they reassessed survival patients with nasopharyngeal RT-PCR and repeat the RT-PCR at least every week until final negative conversion occurs.

• Assessment of late stool SARS-CoV-2 RT-PCR results one month after the date of onset symptom(dso) (% of patients with a positive fecal RT-PCR test after 1 month)
• COVID-19 serological status; associated factors with death and RT-PCR results 1 month after the dso: Age (year), gender, Medical history prior to hospilization : Hypertension, diabetes, coronary artery disease, heart failure, atrial fibrillation, chronic respiratory disease, History of medication: ACEI, ARBs Antiplatetet drug, doses of anticoagulant therapy, antibiotic, corticotherapy, statin, Proton pump inhibitor, T°C>37.8 7 days after the onset of symptoms, weight in kg, height in meter combined to report BMI in kg/m^2, Charlson score, Use of adjuvant oxygen, Lung CT-Scan results : extent of lesion <25%/25-50%/50-75%/>75%, Lymphocytes, platelet, CRP count at the time of diagnosis and 7 days after, GFR at diagnosis ml/min /1.73m2, ABO group, Rhesus antibody, Nasopharyngeal RT PCR initial Cycle Threshold