Low incidence of airborne SARS-CoV-2 in acute care hospital rooms with optimized ventilation.
Emerg Microbes Infect
; 9(1): 2597-2605, 2020 Dec.
Article
in English
| MEDLINE | ID: covidwho-933803
ABSTRACT
The worldwide repercussions of COVID-19 sparked important research efforts, yet the detailed contribution of aerosols in the transmission of SARS-CoV-2 has not been elucidated. In an attempt to quantify viral aerosols in the environment of infected patients, we collected 100 air samples in acute care hospital rooms hosting 22 patients over the course of nearly two months using three different air sampling protocols. Quantification by RT-qPCR (ORF1b) led to 11 positive samples from 6 patient rooms (Ct < 40). Viral cultures were negative. No correlation was observed between particular symptoms, length of hospital stay, clinical parameters, and time since symptom onset and the detection of airborne viral RNA. Low detection rates in the hospital rooms may be attributable to the appropriate application of mitigation methods according to the risk control hierarchy, such as increased ventilation to 4.85 air changes per hour to create negative pressure rooms. Our work estimates the mean emission rate of patients and potential airborne concentration in the absence of ventilation. Additional research is needed understand aerosolization events occur, contributing factors, and how best to prevent them.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Ventilation
/
Air Microbiology
/
SARS-CoV-2
/
COVID-19
/
Hospitals
Type of study:
Observational study
/
Prognostic study
Limits:
Adult
/
Aged
/
Animals
/
Female
/
Humans
/
Male
/
Middle aged
Language:
English
Journal:
Emerg Microbes Infect
Year:
2020
Document Type:
Article
Affiliation country:
22221751.2020.1850184
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