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      SARS in Healthcare Facilities, Toronto and Taiwan

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          Abstract

          The healthcare setting was important in the early spread of severe acute respiratory syndrome (SARS) in both Toronto and Taiwan. Healthcare workers, patients, and visitors were at increased risk for infection. Nonetheless, the ability of individual SARS patients to transmit disease was quite variable. Unrecognized SARS case-patients were a primary source of transmission and early detection and intervention were important to limit spread. Strict adherence to infection control precautions was essential in containing outbreaks. In addition, grouping patients into cohorts and limiting access to SARS patients minimized exposure opportunities. Given the difficulty in implementing several of these measures, controls were frequently adapted to the acuity of SARS care and level of transmission within facilities. Although these conclusions are based only on a retrospective analysis of events, applying the experiences of Toronto and Taiwan to SARS preparedness planning efforts will likely minimize future transmission within healthcare facilities.

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          A novel coronavirus associated with severe acute respiratory syndrome.

          Thomas G Ksiazek, Dean Erdman, Cynthia Goldsmith … (2003)
          A worldwide outbreak of severe acute respiratory syndrome (SARS) has been associated with exposures originating from a single ill health care worker from Guangdong Province, China. We conducted studies to identify the etiologic agent of this outbreak. We received clinical specimens from patients in seven countries and tested them, using virus-isolation techniques, electron-microscopical and histologic studies, and molecular and serologic assays, in an attempt to identify a wide range of potential pathogens. None of the previously described respiratory pathogens were consistently identified. However, a novel coronavirus was isolated from patients who met the case definition of SARS. Cytopathological features were noted in Vero E6 cells inoculated with a throat-swab specimen. Electron-microscopical examination revealed ultrastructural features characteristic of coronaviruses. Immunohistochemical and immunofluorescence staining revealed reactivity with group I coronavirus polyclonal antibodies. Consensus coronavirus primers designed to amplify a fragment of the polymerase gene by reverse transcription-polymerase chain reaction (RT-PCR) were used to obtain a sequence that clearly identified the isolate as a unique coronavirus only distantly related to previously sequenced coronaviruses. With specific diagnostic RT-PCR primers we identified several identical nucleotide sequences in 12 patients from several locations, a finding consistent with a point-source outbreak. Indirect fluorescence antibody tests and enzyme-linked immunosorbent assays made with the new isolate have been used to demonstrate a virus-specific serologic response. This virus may never before have circulated in the U.S. population. A novel coronavirus is associated with this outbreak, and the evidence indicates that this virus has an etiologic role in SARS. Because of the death of Dr. Carlo Urbani, we propose that our first isolate be named the Urbani strain of SARS-associated coronavirus. Copyright 2003 Massachusetts Medical Society
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            Clinical progression and viral load in a community outbreak of coronavirus-associated SARS pneumonia: a prospective study.

            J S M Peiris, C M Chu, V Cheng … (2003)
            We investigated the temporal progression of the clinical, radiological, and virological changes in a community outbreak of severe acute respiratory syndrome (SARS). We followed up 75 patients for 3 weeks managed with a standard treatment protocol of ribavirin and corticosteroids, and assessed the pattern of clinical disease, viral load, risk factors for poor clinical outcome, and the usefulness of virological diagnostic methods. Fever and pneumonia initially improved but 64 (85%) patients developed recurrent fever after a mean of 8.9 (SD 3.1) days, 55 (73%) had watery diarrhoea after 7.5 (2.3) days, 60 (80%) had radiological worsening after 7.4 (2.2) days, and respiratory symptoms worsened in 34 (45%) after 8.6 (3.0) days. In 34 (45%) patients, improvement of initial pulmonary lesions was associated with appearance of new radiological lesions at other sites. Nine (12%) patients developed spontaneous pneumomediastinum and 15 (20%) developed acute respiratory distress syndrome (ARDS) in week 3. Quantitative reverse-transcriptase (RT) PCR of nasopharyngeal aspirates in 14 patients (four with ARDS) showed peak viral load at day 10, and at day 15 a load lower than at admission. Age and chronic hepatitis B virus infection treated with lamivudine were independent significant risk factors for progression to ARDS (p=0.001). SARS-associated coronavirus in faeces was seen on RT-PCR in 65 (97%) of 67 patients at day 14. The mean time to seroconversion was 20 days. The consistent clinical progression, shifting radiological infiltrates, and an inverted V viral-load profile suggest that worsening in week 2 is unrelated to uncontrolled viral replication but may be related to immunopathological damage.
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              Guideline for isolation precautions in hospitals. The Hospital Infection Control Practices Advisory Committee.

              Trenton W. J. Garner (1995)
              Article 0 comments Cited 111 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Emerg Infect Dis
                Journal ID (iso-abbrev): Emerging Infect. Dis
                Journal ID (publisher-id): EID
                Title: Emerging Infectious Diseases
                Publisher: Centers for Disease Control and Prevention
                ISSN (Print): 1080-6040
                ISSN (Electronic): 1080-6059
                Publication date (Print): May 2004
                Volume: 10
                Issue: 5
                Pages: 777-781
                Affiliations
                [* ]Centers for Disease Control and Prevention, Atlanta, Georgia, USA
                [† ]Sunnybrook and Women’s College Health Sciences Centre, Toronto, Ontario, Canada
                [‡ ]Center for Disease Control, Taipei, Taiwan
                [§ ]Health Canada, Ottawa, Ontario, Canada
                []Mount Sinai Hospital, Toronto, Ontario, Canada
                Author notes
                Address for correspondence: L. Clifford McDonald, Centers for Disease Control and Prevention, 1600 Clifton Road, Mailstop A35, Atlanta GA, 30333, USA; fax: 404-639-2647; email: ljm3@ 123456cdc.gov
                Article
                Publisher ID: 03-0791
                DOI: 10.3201/eid1005.030791
                PMC ID: 3323242
                PubMed ID: 15200808
                SO-VID: a2a8a999-2eb8-49a1-8e26-0811c9810b7e
                History
                Categories
                Subject: Perspective

                ScienceOpen disciplines: Infectious disease & Microbiology
                Keywords: severe acute respiratory syndrome,delivery of healthcare,infection control
                Data availability:
                ScienceOpen disciplines: Infectious disease & Microbiology
                Keywords: severe acute respiratory syndrome, delivery of healthcare, infection control

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