biostudies-literatureUnknown9(6)Lu Z<h4>Objectives</h4>To explore the multifactorial causality of prolonged viral shedding time and identify different viral shedding trajectories in Omicron BA.2 variant infections.<h4>Methods</h4>The Kaplan-Meier method was used to estimate the survivor function, and the Cox proportional hazards model was fitted to identify factors associated with viral shedding time. Group-based trajectory model (GBTM) was used to identify different viral shedding trajectories. Ordinal logistic regression was used to identify factors that significantly impacted the trajectory membership.<h4>Results</h4>The overall median viral shedding time was 12 days (interquartile range [IQR]: 8-15). Viral shedding time was longer for female cases, cases who were incompletely vaccinated, cases with comorbidities, cases wHeliyone17173https://www.ebi.ac.uk/biostudies/studies/S-EPMC10277587biostudies-literatureUnderstanding the viral shedding time of Omicron variant BA.2 infection in Shanghai: A population-based observational study.PMC10277587Lu ZLi BHuang LKuang ZSong ZfalseUnderstanding the viral shedding time of Omicron variant BA.2 infection in Shanghai: A population-based observational study.<h4>Objectives</h4>To explore the multifactorial causality of prolonged viral shedding time and identify different viral shedding trajectories in Omicron BA.2 variant infections.<h4>Methods</h4>The Kaplan-Meier method was used to estimate the survivor function, and the Cox proportional hazards model was fitted to identify factors associated with viral shedding time. Group-based trajectory model (GBTM) was used to identify different viral shedding trajectories. Ordinal logistic regression was used to identify factors that significantly impacted the trajectory membership.<h4>Results</h4>The overall median viral shedding time was 12 days (interquartile range [IQR]: 8-15). Viral shedding time was longer for female cases, cases who were incompletely vaccinated, cases with comorbidities, cases w2023-01-01T00:00:00Z2023 Jun2025-04-21T16:58:30.181Z2025-04-21T16:58:30.181ZS-EPMC102775873734256910.1016/j.heliyon.2023.e17173