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Effects of a major deletion in the SARS-CoV-2 genome on the severity of infection and the inflammatory response: an observational cohort study.
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- Author(s): Young, Barnaby E (AUTHOR); Fong, Siew-Wai (AUTHOR); Chan, Yi-Hao (AUTHOR); Mak, Tze-Minn (AUTHOR); Ang, Li Wei (AUTHOR); Anderson, Danielle E (AUTHOR); Lee, Cheryl Yi-Pin (AUTHOR); Amrun, Siti Naqiah (AUTHOR); Lee, Bernett (AUTHOR); Goh, Yun Shan (AUTHOR); Su, Yvonne C F (AUTHOR); Wei, Wycliffe E (AUTHOR); Kalimuddin, Shirin (AUTHOR); Chai, Louis Yi Ann (AUTHOR); Pada, Surinder (AUTHOR); Tan, Seow Yen (AUTHOR); Sun, Louisa (AUTHOR); Parthasarathy, Purnima (AUTHOR); Chen, Yuan Yi Constance (AUTHOR); Barkham, Timothy (AUTHOR)
- Source:
Lancet. 8/29/2020, Vol. 396 Issue 10251, p603-611. 9p. - Source:
- Additional Information
- Subject Terms: SARS-CoV-2; INFLAMMATION; VACCINE development; COHORT analysis; ELECTRONIC health records; VIRAL pneumonia; RESEARCH; GENETIC mutation; RESEARCH methodology; COVID-19; EVALUATION research; MEDICAL cooperation; SEVERITY of illness index; COMPARATIVE studies; GENOMES; EPIDEMICS; GENES; RESPIRATORY therapy; RESEARCH funding; LONGITUDINAL method; DISEASE complications
- Subject Terms:
- Abstract:
Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants with a 382-nucleotide deletion (∆382) in the open reading frame 8 (ORF8) region of the genome have been detected in Singapore and other countries. We investigated the effect of this deletion on the clinical features of infection.Methods: We retrospectively identified patients who had been screened for the ∆382 variant and recruited to the PROTECT study-a prospective observational cohort study conducted at seven public hospitals in Singapore. We collected clinical, laboratory, and radiological data from patients' electronic medical records and serial blood and respiratory samples taken during hospitalisation and after discharge. Individuals infected with the ∆382 variant were compared with those infected with wild-type SARS-CoV-2. Exact logistic regression was used to examine the association between the infection groups and the development of hypoxia requiring supplemental oxygen (an indicator of severe COVID-19, the primary endpoint). Follow-up for the study's primary endpoint is completed.Findings: Between Jan 22 and March 21, 2020, 278 patients with PCR-confirmed SARS-CoV-2 infection were screened for the ∆382 deletion and 131 were enrolled onto the study, of whom 92 (70%) were infected with the wild-type virus, ten (8%) had a mix of wild-type and ∆382-variant viruses, and 29 (22%) had only the ∆382 variant. Development of hypoxia requiring supplemental oxygen was less frequent in the ∆382 variant group (0 [0%] of 29 patients) than in the wild-type only group (26 [28%] of 92; absolute difference 28% [95% CI 14-28]). After adjusting for age and presence of comorbidities, infection with the ∆382 variant only was associated with lower odds of developing hypoxia requiring supplemental oxygen (adjusted odds ratio 0·07 [95% CI 0·00-0·48]) compared with infection with wild-type virus only.Interpretation: The ∆382 variant of SARS-CoV-2 seems to be associated with a milder infection. The observed clinical effects of deletions in ORF8 could have implications for the development of treatments and vaccines.Funding: National Medical Research Council Singapore. [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Lancet is the property of Lancet and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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