The ratio between SARS-CoV-2 RNA viral load and culturable viral titer differs depending on stage of infection: case study of household transmission in an adult male

Le résumé fourni par la source

Effective public health measures for communicable diseases rely on the ability to identify infectious individuals and prevent transmission from those individuals. For SARS-CoV-2, the presence of replication-competent virus in specimens from an individual is the gold standard for confirming infectiousness. However, viral culture from clinical specimens is difficult and infrequently performed. Instead, infectiousness may be inferred based on the abundance of viral RNA (or viral load) in a specimen, which is more easily assessed. For this reason, understanding the relationship between RNA viral load and infectious viral titer has important implications for public health strategy. In this case report, we quantified incident, longitudinal SARS-CoV-2 viral loads collected from saliva and nasal-swab specimens, and viral titer from nasal-swab specimens. We observed that the relationship between viral load and viral titer decreases by over five orders of magnitude throughout the course of the infection. Our work demonstrates the potential for infectious virus even in specimens with low viral loads collected during the early phases of infection.

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