Global efforts have been made in place for controlling the outbreak and environmental transmission is extensively studied (Morawska et al., 2021). The COVID-19 pandemic has continued for more than one year, and it seems not to end soon. Keywords: COVID-19, Airborne transmission, Environmental transmission, Genetic evidences We concluded that the outbreak was triggered by SARS-CoV-2 contaminated environments, where the employees inhaled the virus from the air or touching facility surfaces where the traveler did not have any physical contacts with. The traveler did not have any contacts with the two employees however, genome sequencing showed that SARS-CoV-2 variants from three patients and two environmental surface samples belonged to 20B viral clade, sharing a nucleic acid identity of more than 99.9%. After aging for 5 days in the air, no viable virus was detected. Out of 25 positive environmental air and surface swab samples (N = 237) collected, SARS-CoV-2 was found to have remained airborne (5640–7840 RNA copies m – 3) for more than 4 days in a female washroom. Here, we investigated a COVID-19 outbreak with two fast food employees infected, in which a traveler despite of a 14-day quarantine turned positive after check in with a hotel, using environmental SARS-CoV-2 sampling, epidemiological tracing, viral RNA sequence as well as surveillance method. However, nucleic acid based evidence of direct association of COVID-19 with environmental contamination is lacking. Genetic and epidemiological evidences were found for environmental transmission of COVID-19.Īirborne transmission of COVID-19 plays an important role for the pandemic.Evidence was demonstrated for airborne transmission risk of COVID-19 in a confined air space.Quarantine discharge protocol needs to be revisited to minimize the COVID-19 spread to the public.SARS-CoV-2 Remained Airborne for a Prolonged Time in a Lockdown Confined Space.
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