Early Identification of SARS-CoV-2 Emergence in the DoD via Retrospective Analysis of 2019-2020 Upper Respiratory Illness Samples

Abstract

ABSTRACTThe first case of non-travel related SARS-COV-2 was detected late February 2020 in California, however the delay of diagnostic testing and initial stringent testing criteria made it difficult to identify those who could have acquired it through community spread. There was speculation by many that the virus may have been circulating at least a month earlier [1], and environmental sampling has suggested that versions of this virus were found many months before the first human samples were identified [2]. Here we performed a retrospective study from residual samples collected from a global DoD Respiratory Surveillance Program to establish a tentative timeline by which this virus was circulating in our DoD population. We performed RT-PCR for SARS-COV-2 and compared to the dates of these cases to the first cases identified in respective states and counties using the Johns Hopkins COVID tracker website. Twenty-four positive samples were identified out of approximately 7,000 tested. Although we found some early cases in certain regions, we did not see circulation before late February in samples collected both in the US and outside the USA.SUMMARYWhat is already known about this topic?We know that the first reported case of SARS-COV-2 was mid-January; however, there has been conjecture that the virus was found in the community before this date.What is added by this report?Here we took samples collection from a global respiratory surveillance program and evaluated for the presence of SARS-COV-2 RNA. The first case we found in the surveillance program was approximately 30-60 days before the first case was identified on military installations via diagnostic testing, however was not earlier than the mid-January reported case in California.What are the implications for public health practice?The implementation of new and emerging pathogen detection assays into already established surveillance programs could detect early community spread and possibly reduce spread of pathogen among vulnerable populations.