Abstract
The novel Coronavirus SARS-CoV-2 caused an outbreak of pneumonia in Wuhan, Hubei province of China in January 2020. This study aims to investigate the effects of different temperature and time durations of virus inactivation on the results of PCR testing for SARS-CoV-2. Twelve patients at the Renmin Hospital of Wuhan University suspected of being infected with SARS-CoV-2 were selected on February 13, 2020 and throat swabs were taken. The swabs were stored at room temperature (20–25°C), then divided into aliquots and subjected to different temperature for different periods in order to inactivate the viruses (56°C for 30, 45, 60 min; 65, 70, 80°C for 10, 15, 20 min). Control aliquots were stored at room temperature for 60 min. Then all aliquots were tested in a real-time fluorescence PCR using primers against SARS-CoV-2. Regardless of inactivation temperature and time, 7 of 12 cases (58.3%) tested were positive for SARS-CoV-2 by PCR, and cycle threshold values were similar. These results suggest that virus inactivation parameters exert minimal influence on PCR test results. Inactivation at 65°C for 10 min may be sufficient to ensure safe, reliable testing.
Key words: SARS-CoV-2, COVID-19, throat swabs, real-time fluorescence PCR
Conflict of Interest Statement
I declare on behalf of my co-authors and myself that we do not have any conflict of interest to declare.
Footnotes
This work was supported by grants from the Special Science and Technology Cooperation Project of Ningxia Hui Autonomous Region Key R&D Program (No. 2018BFG02008) and the National Science and Technology Key Projects on “Major Infectious Diseases such as HIV/AIDS, Viral Hepatitis Prevention and Treatment” (No. 2017ZX10103005).
These authors contributed equally to this work.
Contributor Information
Ze-gang Wu, Email: wuzegang1234@163.com.
Hong-yun Zheng, Email: shenzheng2008@163.com.
Jian Gu, Email: tekjian@gmail.com.
Yong-qmg Tong, Email: tytsing@163.com.
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