Abstract
ABSTRACT.During the COVID-19 pandemic, Thailand implemented a quarantine program at approved quarantine facilities for every international traveler. Here, we report an epidemiological and genomic investigation of a COVID-19 cluster consisting of seven healthcare workers (HCWs) at a quarantine facility and its partnered hospital in Thailand. Outbreak investigations were implemented to obtain contact tracing data and to establish chains of transmission. Genomic sequencing of SARS-CoV-2 with samples within the cohort was performed. Investigations of 951 HCWs and staff with quarantined travelers were implemented to determine the chain of transmission. Genomic and outbreak investigations identified the international travelers infected with the B.1.1.31 SARS-CoV-2 lineage as the source of this outbreak. The genomic data and the investigated timeline revealed a putative transmission chain among HCWs, pointing toward the transmission via the use of common living quarters at the investigated quarantine site. The evaluation of this cohort has led to a policy recommendation on quarantine facility management. International travel quarantine is an important strategy to contain importation of COVID-19 cases. However, a quarantine facility is likely to become a potential hotspot, requiring thorough preventive measures. Reducing the exposure risk by providing private living quarters and scheduling clinical duties at a quarantine site separated from the conventional healthcare workforce have been implemented.
Highlights
MATERIALS AND METHODSHealthcare workers (HCWs) play a vital role in the frontline response against the COVID-19 pandemic
Healthcare workers worldwide are at risk of becoming infected while performing clinical duties, leading to substantial loss in the medical workforce and even deaths from COVID-19.1 Development of control and preventive measures to protect healthcare workers (HCWs) is critical and has to be strengthened based on new information gained during the ongoing pandemic
Transmission of COVID-19 originating from a quarantine facility poses a real threat
Summary
MATERIALS AND METHODSHealthcare workers (HCWs) play a vital role in the frontline response against the COVID-19 pandemic. An ASQ facility is a hotel accredited by the Thai health authorities and partnered with a hospital to monitor quarantined individuals for signs and symptoms of COVID-19 and to collect nasopharyngeal/oropharyngeal swabs for real-time polymerase chain reaction (RT-PCR) testing twice on Days 0–5 and Days 11–13 after entering the country.
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