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Osaka H, Tagashira Y, Takeuchi H, Tanaka Y, Tanimoto K, Gu Y. Nosocomial outbreak of SARS-CoV-2 in a hospital ward during the Omicron variant-dominant wave with a review of the relevant literature. Jpn J Infect Dis 2024:JJID.2023.464. [PMID: 38825458 DOI: 10.7883/yoken.jjid.2023.464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
Clusters of nosocomial coronavirus disease 2019 (COVID-19) were reported globally during the recent pandemic. Unfortunately, these clusters negatively impacted inpatient morbidity, mortality, and hospital functions. Using epidemiological data and whole genome sequencing (WGS) of SARS-CoV-2, the present study investigated an outbreak of COVID-19 at a university hospital. Eight inpatients and 13 healthcare workers tested positive for SARS-CoV-2 during a one-month period. Whole genome sequencing (WGS) of the virus in 11 patients revealed that two variants of concern belonging to the Omicron sublineages, BA.2.3 and BA1.1.2, had caused the outbreak during a time when the proportion of the Omicron lineage in the community was changing. When variants of concern are undergoing mutation, a response to the outbreak should be made with multiple variants in mind, even in the absence of epidemiological data showing close contact or other potential vectors of infection, and awareness about infection prevention and control should be raised to safeguard patient safety.
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Affiliation(s)
- Hilary Osaka
- Department of Infectious Diseases, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Japan
| | - Yasuaki Tagashira
- Department of Infectious Diseases, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Japan
- Division of Infection Prevention and Control, Tokyo Medical and Dental University Hospital, Japan
| | - Hiroaki Takeuchi
- Department of High-risk Infectious Disease Control, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Japan
| | - Yukie Tanaka
- Department of Molecular Microbiology and Immunology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Japan
| | - Kousuke Tanimoto
- Research Core, Institute of Research, Tokyo Medical and Dental University (TMDU), Japan
| | - Yoshiaki Gu
- Department of Infectious Diseases, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Japan
- Division of Infection Prevention and Control, Tokyo Medical and Dental University Hospital, Japan
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Uno S, Goto R, Honda K, Uchida S, Uwamino Y, Namkoong H, Yoshifuji A, Mikita K, Takano Y, Matsumoto M, Kitagawa Y, Hasegawa N. Cost-Effectiveness of Universal Asymptomatic Preoperative SARS-CoV-2 Polymerase Chain Reaction Screening: A Cost-Utility Analysis. Clin Infect Dis 2024; 78:57-64. [PMID: 37556365 PMCID: PMC10810706 DOI: 10.1093/cid/ciad463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/31/2023] [Accepted: 08/04/2023] [Indexed: 08/11/2023] Open
Abstract
BACKGROUND An early report has shown the clinical benefit of the asymptomatic preoperative severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) screening test, and some clinical guidelines recommended this test. However, the cost-effectiveness of asymptomatic screening was not evaluated. We aimed to investigate the cost-effectiveness of universal preoperative screening of asymptomatic patients for SARS-CoV-2 using polymerase chain reaction (PCR) testing. METHODS We evaluated the cost-effectiveness of asymptomatic screening using a decision tree model from a payer perspective, assuming that the test-positive rate was 0.07% and the screening cost was 8500 Japanese yen (JPY) (approximately 7601 US dollars [USD]). The input parameter was derived from the available evidence reported in the literature. A willingness-to-pay threshold was set at 5 000 000 JPY/quality-adjusted life-year (QALY). RESULTS The incremental cost of 1 death averted was 74 469 236 JPY (approximately 566 048 USD) and 291 123 368 JPY/QALY (approximately 2 212 856 USD/QALY), which was above the 5 000 000 JPY/QALY willingness-to-pay threshold. The incremental cost-effectiveness ratio fell below 5 000 000 JPY/QALY only when the test-positive rate exceeded 0.739%. However, when the probability of developing a postoperative pulmonary complication among SARS-CoV-2-positive patients was below 0.22, asymptomatic screening was never cost-effective, regardless of how high the test-positive rate became. CONCLUSIONS Asymptomatic preoperative universal SARS-CoV-2 PCR screening is not cost-effective in the base case analysis. The cost-effectiveness mainly depends on the test-positive rate, the frequency of postoperative pulmonary complications, and the screening costs; however, no matter how high the test-positive rate, the cost-effectiveness is poor if the probability of developing postoperative pulmonary complications among patients positive for SARS-CoV-2 is sufficiently reduced.
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Affiliation(s)
- Shunsuke Uno
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
- Health Technology Assessment Unit, Department of Preventive Medicine and Public Health, Keio University School of Medicine, Tokyo, Japan
| | - Rei Goto
- Health Technology Assessment Unit, Department of Preventive Medicine and Public Health, Keio University School of Medicine, Tokyo, Japan
- Graduate School of Business Administration, Keio University, Kanagawa, Japan
- Graduate School of Health Management, Keio University, Kanagawa, Japan
| | - Kimiko Honda
- Health Technology Assessment Unit, Department of Preventive Medicine and Public Health, Keio University School of Medicine, Tokyo, Japan
- Graduate School of Health Management, Keio University, Kanagawa, Japan
- Center of Health Economics and Health Technology Assessment, Keio University Global Research Institute, Tokyo, Japan
| | - Sho Uchida
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Yoshifumi Uwamino
- Department of Laboratory Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Ho Namkoong
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Ayumi Yoshifuji
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Kei Mikita
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Yaoko Takano
- Division of Infectious Diseases and Infection Control, Keio University Hospital, Tokyo, Japan
| | - Morio Matsumoto
- Department of Orthopedics, Keio University School of Medicine, Tokyo, Japan
| | - Yuko Kitagawa
- Department of Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Naoki Hasegawa
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
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