Abstract
The emergence of highly transmissible SARS-CoV-2 variants has created a need to reassess the risk posed by increasing social contacts as countries resume pre-pandemic activities, particularly in the context of resuming large-scale events over multiple days. To examine how social contacts formed in different activity settings influences interventions required to control Delta variant outbreaks, we collected high-resolution data on contacts among passengers and crew on cruise ships and combined the data with network transmission models. We found passengers had a median of 20 (IQR 10-36) unique close contacts per day, and over 60% of their contact episodes were made in dining or sports areas where mask wearing is typically limited. In simulated outbreaks, we found that vaccination coverage and rapid antigen tests had a larger effect than mask mandates alone, indicating the importance of combined interventions against Delta to reduce event risk in the vaccine era.
【초록키워드】 vaccination, SARS-CoV-2 variant, Delta, risk, Intervention, Transmission, delta variant, Mask, Outbreaks, Rapid antigen tests, Coverage, rapid antigen test, close contact, Crew, Contact, High-resolution, Mask mandates, activities, social contact, country, mask mandate, event, collected, required, median, per day, unique, reduce, the vaccine, influence, IQR, 【제목키워드】 SARS-CoV-2 transmission, Contact, High-resolution, event, evaluate,