This research examined how COVID-19 viral loads change over time across saliva, throat, and nasal samples. The study found that different sample types detect infection at different stages, demonstrating that testing method matters. These findings could improve diagnostic strategies for COVID-19, influenza, RSV, and future emerging respiratory viruses.

This study tracked viral load in saliva, throat, and nose samples collected daily from newly infected individuals. The findings show each sample type follows a distinct viral-load trajectory, with saliva and throat detecting infection earlier than nose. This has major implications for COVID test accuracy, sampling strategies, and future pandemic preparedness.