Abstract Background As of today, more than 8 million people have been infected and around 440,000 of them have lost their lives due to complications of SARS-CoV-2 infection. The first confirmed case of COVID-19 in Mexico was on February 28, 2020, and currently, there are more than 150,300 confirmed cases and more than 17,500 deaths have been reported, this work presents the characteristics of the first cases on a tertiary care center with special focus on common comorbidities in Mexicans. Methods We conducted a case series of patients with the diagnosis of pneumonia due to SARS-CoV-2 virus admitted to a tertiary care center in Mexico City, between March 14th and May 4th, 2020. Data collected included demographic information, comorbidities, clinical presentation, and outcomes. Regarding clinical outcomes, we measured the need of admission to Intensive Care Unit (ICU), mortality during hospitalization, discharge, and patients that remained hospitalized. Results 85 patients were included, median age 53.5 years; 69.4% were male. Most common clinical manifestations at admission were fever (61, 71.8%), cough (29, 34.1%), headache (25, 29.4%) and dyspnea (22, 25.9%). Most common comorbidities were overweight (44/82, 53.6%), obesity (25/82, 30.5%), hypertension (18, 21.2%), and diabetes (17, 20%). 31 of 85 (36.5%) patients were diagnosed with critical disease, whereas 54 of 85 (63.5%) were classified as non-critical. In the 31 critically ill patients, the length of invasive mechanical ventilation was 13 days [range {2–45}]; 5 patients (16.1%) required tracheostomy. The mean of mechanical ventilation prior to tracheostomy was 19.8 days [range {14–25}]. In all patients, the total length of hospitalization was 12.1 days [range {2–52}], 14.8 days [range {3–52}] in ICU patients, and 6.7 days [range {2–30}] in floor unit patients. No readmissions were documented. Global mortality was 4.7% (9.6% in ICU, 1.8% in floor unit). Of the 4 deceased patients, 3 presented comorbidities (75%), while 1 was previously healthy, documenting massive pulmonary embolism as the cause of sudden death. Conclusion This study shows that the clinical characteristics in this initial cohort are not different that described elsewhere. Mortality is low but it is mainly related to prevalent comorbidities in the Mexican population. Disclosures All Authors: No reported disclosures