459. Outcomes and Factors Associated with a SARS-CoV-2 Positive Test in Asymptomatic and Symptomatic Healthcare Workers of a Mexican Hospital Converted to Treat COVID-19 Patients

BACKGROUND: Starting on 03/16/2020, the hospital was converted to attend only patients with COVID-19. A surveillance program for healthcare workers (HCWs) that included free in-site medical consultation and RT-PCR for detection of SARS-CoV-2 was initiated. On 04/28/2020, screening of HCWs was started to detect asymptomatic carriers. We report the results of such programs updated to 05/21/2020. METHODS: Sex, worker category, working area, use of personal protective equipment, date of screening, date of onset of symptoms and home address were retrieved from electronic databases. Logistic regression was done to identify factors associated with being a COVID-19 case or carrier, with p< 0.05 being significant. Odds ratios and incidence densities were calculated. RESULTS: Of 2566 HCWs in the hospital, 976 (38.0%) underwent screening and 41 (4.2%) were positive for SARS-CoV-2 (7.4 carriers x 10,000 person-days; median follow-up of 55.5 days); none of the latter were diagnosed with COVID-19 after completing a 14-day follow-up. Of HCWs with negative screen results, 6 (0.6%) ultimately developed COVID-19 after a median of 10 days (1.1 cases x 10,000 person-days). Of 232 symptomatic HCWs that did not undergo basal screening, 131 (56.5%) were diagnosed with COVID-19 (8.8 cases x 10,000 person-days). Ten COVID-19 cases (7.6%) were hospitalized and all were discharged without complications after a median hospital stay of 9 days. Factors associated with COVID-19 were working in a non-clinical area (OR=9.3, 95% CI=1.1–78.6) and being a nurse (OR=1.9, 95% CI=1.1–3.4). Factors associated with being a carrier were living in the State of Mexico (OR=3.7, 95% CI=1.8–8.0) and being a hospital cook (OR=3.7, 95% CI=1.7–8.5). Being a physician was associated with not being a carrier (OR=0.07, 95% CI=0.01–0.5). Wearing a face mask at all times tended to be associated with not being a carrier. Hospital epidemic curves closely ressembled those of the community (Mexico City). Hospital Epidemic Curve, 03/16/2020 - 05/21/2020 [Image: see text] CONCLUSION: This study suggests that factors present inside and outside of the hospital are associated with COVID-19 and asymptomatic carriage in HCWs. This information is of utmost importance for infection prevention and control policies. Additionally, a lower percentage of severe cases and no deaths were observed in this cohort as compared to others. DISCLOSURES: All Authors: No reported disclosures