Preliminary reports show that nosocomial SARS-CoV-2 infection is not associated with increased mortality compared with community acquired infection.
Retrospective comparison of COVID-19 adult patients who were classified according to probable time of acquisition of SARS-CoV-2 and symptom onset. Data from hospitalized patients that were hospitalized in non-COVID-19 areas were reviewed.
All patients were classified as community-acquired/Community-onset (CA-CO), Community- acquired/hospital-onset (CA-HO) and Hospital-acquired/Hospital-onset (HA-HO) cases. All patients without respiratory symptoms were tested on day one and if negative, hospitalized in non-COVID-19 areas.
We identified 59 patients that fulfilled the definition of CA-HO or HA-HO COVID-19. Patients in the CA-CO group were less likely to have multiple comorbidities than the patients in the CA-HO and HA-HO groups. Mortality was lower in the CA-CO group (21.8%) compared to the other groups, although it did not reach statistical significance.
We identified 9 clusters of HA-HO cases arising from multiple-bed rooms from the non-COVID-19 areas. There was no significant difference for HA-HO COVID-19 between patients placed in a common-room bed compared to patients placed on single bed rooms (p=.19). Nevertheless, the RR for HA-HO COVID-19 was 105 (95% CI 62.9 to 177.6) for patients treated in a common-room allocating another COVID-19-detected patient within the immediate 24 h time frame (P=<0.01).
Hospital-acquired COVID-19 is newly described and poses a challenge for infection control. We identified small clusters related to multiple-bed rooms from non-COVID-19 hospitalization wards and propose a simple time-based classification for hospital surveillance and isolation precautions.