SARS-CoV-2 Viral Load in Upper Respiratory Specimens of Infected Patients

Type Letter Author Lirong Zou Author Feng Ruan Author Mingxing Huang Author Lijun Liang Author Huitao Huang Author Zhongsi Hong Author Jianxiang Yu Author Min Kang Author Yingchao Song Author Jinyu Xia Author Qianfang Guo Author Tie Song Author Jianfeng He Author Hui-Ling Yen Author Malik Peiris Author Jie Wu URL https://www.nejm.org/doi/10.1056/NEJMc2001737 Rights Copyright © 2020 Massachusetts Medical Society. All rights reserved. Date 19/03/2020 Loc. in Archive world Extra Publication Title: New England Journal of Medicine Publisher: Massachusetts Medical Society DOI: 10.1056/NEJMc2001737 Library Catalog www.nejm.org Type letter Language en Abstract Correspondence from The New England Journal of Medicine — SARS-CoV-2 Viral Load in Upper Respiratory Specimens of Infected Patients The 2019 novel coronavirus (SARS-CoV-2) epidemic, which was first reported in December 2019 in Wuhan, China, and has been declared a public health emergency of international concern by the World Health Organization, may progress to a pandemic associated with substantial morbidity and mortality. SARS-CoV-2 is genetically related to SARS-CoV, which caused a global epidemic with 8096 confirmed cases in more than 25 countries in 2002–2003.1 The epidemic of SARS-CoV was successfully contained through public health interventions, including case detection and isolation. Transmission of SARS-CoV occurred mainly after days of illness2 and was associated with modest viral loads in the respiratory tract early in the illness, with viral loads peaking approximately 10 days after symptom onset.3 We monitored SARS-CoV-2 viral loads in upper respiratory specimens obtained from 18 patients (9 men and 9 women; median age, 59 years; range, 26 to 76) in Zhuhai, Guangdong, China, including 4 patients with secondary infections (1 of whom never had symptoms) within two family clusters (Table S1 in the Supplementary Appendix, available with the full text of this letter at NEJM.org). The patient who never had symptoms was a close contact of a patient with a known case and was therefore monitored. A total of 72 nasal swabs (sampled from the mid-turbinate and nasopharynx) (Figure 1A) and 72 throat swabs (Figure 1B) were analyzed, with 1 to 9 sequential samples obtained from each patient. Polyester flock swabs were used for all the patients.