Background: Cleanliness of hospital surfaces helps prevent healthcare-associated infections, but larger evaluations of the effectiveness of various cleaning strategies during SARS-CoV-2 surges and worker shortages are scarce .
Methods: In an acute care hospital (ACH) and a long-term care facility (LTCF), 417 surfaces were tested for SARS-CoV-2 and adenosine triphosphate before and after various cleaning strategies, including ultraviolet light (UV-C), electrostatic spraying, and room fogging .
Results: ACH surface contamination differed among outbreak and non-outbreak wards (p = 0.001). RNA was detected on 66% of surfaces before cleaning and on 23% of those surfaces immediately after terminal cleaning, for a 65% post-cleaning reduction (p = 0.001). UV-C resulted in an 87% reduction (p = 0.023), while spraying with electrostatic bleach resulted in a 47% reduction (p = 0.010). LTCF contamination rates differed between the dementia, rehabilitation, and the residential units (p = 0.005). 67% of surfaces had RNA after room fogging without terminal-style wiping . Fogging with wiping led to an 11% reduction in the proportion of positive surfaces .
Discussion: Baseline contamination varied by type of unit and outbreak conditions, but not facility type . Removal of viral RNA varied according to strategy . Unlike previous reports, time spent cleaning was associated with cleaning thoroughness.