Determining a sampling regime for PCR detection of respiratory tract viral infection at coronial post-mortem examinations

This study was performed retrospectively using data from Coronial autopsies over the period 2012 –2019 from which swabs from the nasopharyngeal region, trachea and lung parenchyma, in addition to samples of lung tissue, had been submitted for multiplex PCR detection of respiratory pathogens. From 97 cases with all four samples, there were 24 with at least one positive result for viral infecti on. Some cases had multiple positive results and a total of 27 respiratory tract viruses were identified, of which rhinovirus, influenza A virus and respiratory syncytial virus were the most common. Seventeen of the 27 viral infections (63%) were identified in all four samples. However, in nearly al l cases (96%) the nasopharyngeal swab detected the infective agent when the multiplex PCR panel had detected infection in any of the four sample types. A nasopharyngeal swab is considered to be an optimal sample for detection of respiratory tract viral infection. As the samples analyzed were acquire d before the appearance of the COVID-19 virus, the applicability of this finding for COVID-19 screening is not established.
Source: Forensic Science, Medicine, and Pathology - Category: Forensic Medicine Source Type: research