What is already known on this topic?Aerosol transmission was one route for the spread of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and usually occurred in confined spaces.What is added by this report?...What is already known on this topic?Aerosol transmission was one route for the spread of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and usually occurred in confined spaces.What is added by this report?Aerosol transmission was found to exist between handshake buildings,i.e.,buildings with extremely close proximity that formed relatively enclosed spaces.Transmission was mainly affected by the airflow layout caused by switching air conditioners on and off as well as opening and closing doors and windows.What are the implications for public health practice?Centralized isolation and home isolation in handshake buildings creates a risk of SARS-CoV-2 aerosol transmission under certain conditions.Attention should be paid to the influence of air distribution layout on aerosol diffusion in isolation wards,and disinfection of isolation venues should be strengthened.展开更多
Summary What is already known about this topic?Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)reinfection by variants is being reported commonly and has caused waves of epidemic in many countries.Because o...Summary What is already known about this topic?Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)reinfection by variants is being reported commonly and has caused waves of epidemic in many countries.Because of dynamic zero policy,the SARSCoV-2 reinfection was less reported in China.What is added by this report?SARS-CoV-2 reinfections were observed in Guangdong Province between December 2022 and January 2023.This study estimated that the reinfection incidence was 50.0%for the original strain primary infections,35.2%for the Alpha or Delta variants,and 18.4%for the Omicron variant;The reinfection incidence within 3-6 months after primary infection by Omicron variant was 4.0%.Besides,96.2%reinfection cases were symptomatic while only 7.7%sought medical attention.What are the implications for public health practice?These findings suggest a reduced likelihood of an Omicron-driven epidemic resurgence in the short term but emphasize the importance of maintaining vigilant surveillance of emerging SARS-CoV-2 variants and conducting population-based antibody level surveys to inform response preparedness.展开更多
文摘What is already known on this topic?Aerosol transmission was one route for the spread of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)and usually occurred in confined spaces.What is added by this report?Aerosol transmission was found to exist between handshake buildings,i.e.,buildings with extremely close proximity that formed relatively enclosed spaces.Transmission was mainly affected by the airflow layout caused by switching air conditioners on and off as well as opening and closing doors and windows.What are the implications for public health practice?Centralized isolation and home isolation in handshake buildings creates a risk of SARS-CoV-2 aerosol transmission under certain conditions.Attention should be paid to the influence of air distribution layout on aerosol diffusion in isolation wards,and disinfection of isolation venues should be strengthened.
基金Supported by the Key-Area Research and Development Program of Guangdong Province(2022B1111020006)the Natural Science Foundation of China(82341034).
文摘Summary What is already known about this topic?Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)reinfection by variants is being reported commonly and has caused waves of epidemic in many countries.Because of dynamic zero policy,the SARSCoV-2 reinfection was less reported in China.What is added by this report?SARS-CoV-2 reinfections were observed in Guangdong Province between December 2022 and January 2023.This study estimated that the reinfection incidence was 50.0%for the original strain primary infections,35.2%for the Alpha or Delta variants,and 18.4%for the Omicron variant;The reinfection incidence within 3-6 months after primary infection by Omicron variant was 4.0%.Besides,96.2%reinfection cases were symptomatic while only 7.7%sought medical attention.What are the implications for public health practice?These findings suggest a reduced likelihood of an Omicron-driven epidemic resurgence in the short term but emphasize the importance of maintaining vigilant surveillance of emerging SARS-CoV-2 variants and conducting population-based antibody level surveys to inform response preparedness.
