tetano
Editor, Senior Moderator
Int J Infect Dis
. 2022 Nov 22;S1201-9712(22)00613-0.
doi: 10.1016/j.ijid.2022.11.023. Online ahead of print.
Indoor relative humidity shapes influenza seasonality in temperate and subtropical climates in China
Hao Lei[SUP] 1 [/SUP], Mengya Yang[SUP] 2 [/SUP], Zhaomin Dong[SUP] 3 [/SUP], Kejia Hu[SUP] 2 [/SUP], Tao Chen[SUP] 4 [/SUP], Lei Yang[SUP] 4 [/SUP], Nan Zhang[SUP] 5 [/SUP], Xiaoli Duan[SUP] 6 [/SUP], Shigui Yang[SUP] 2 [/SUP], Dayan Wang[SUP] 4 [/SUP], Yuelong Shu[SUP] 7 [/SUP], Yuguo Li[SUP] 8 [/SUP]
Affiliations
Abstract
Objective: The aim of this study was to explore whether indoor or outdoor relative humidity (RH) modulates the influenza epidemics transmission in temperate and subtropical climates.
Methods: In this study, daily temperature and RH in 1558 households from March 2017 to January 2019 in five cities across both temperate and subtropical regions in China were collected. City-level outdoor temperature and RH from 2013 to 2019 was collected from the weather stations. We first estimated the effective reproduction number (R[SUB]t[/SUB]) of influenza, and then used time-series analyses to explore the relationship between indoor/outdoor RH/absolute humidity (AH) and R[SUB]t[/SUB] of influenza. Furthermore, we expanded the measured one-year indoor temperature and RH data into five years, and used same method to examine the relationship between indoor/outdoor RH and R[SUB]t[/SUB] of influenza.
Results: Indoor RH displayed a seasonal pattern with highs during the summer months and lows during the winter months, while outdoor RH fluctuated with no consistent pattern in subtropical regions. R[SUB]t[/SUB] of influenza followed a U-shaped relationship with indoor RH in both temperate and subtropical regions, while U-shaped relationship was not observed between outdoor RH and R[SUB]t[/SUB]. In addition, indoor RH may be a better indicator for R[SUB]t[/SUB] of influenza than indoor AH.
Conclusion: The findings indicated that indoor RH may be the driver of influenza seasonality in both temperate and subtropical locations in China.
Keywords: China; Influenza; humidity; indoor; outdoor; seasonality.
. 2022 Nov 22;S1201-9712(22)00613-0.
doi: 10.1016/j.ijid.2022.11.023. Online ahead of print.
Indoor relative humidity shapes influenza seasonality in temperate and subtropical climates in China
Hao Lei[SUP] 1 [/SUP], Mengya Yang[SUP] 2 [/SUP], Zhaomin Dong[SUP] 3 [/SUP], Kejia Hu[SUP] 2 [/SUP], Tao Chen[SUP] 4 [/SUP], Lei Yang[SUP] 4 [/SUP], Nan Zhang[SUP] 5 [/SUP], Xiaoli Duan[SUP] 6 [/SUP], Shigui Yang[SUP] 2 [/SUP], Dayan Wang[SUP] 4 [/SUP], Yuelong Shu[SUP] 7 [/SUP], Yuguo Li[SUP] 8 [/SUP]
Affiliations
- PMID: 36427703
- DOI: 10.1016/j.ijid.2022.11.023
Abstract
Objective: The aim of this study was to explore whether indoor or outdoor relative humidity (RH) modulates the influenza epidemics transmission in temperate and subtropical climates.
Methods: In this study, daily temperature and RH in 1558 households from March 2017 to January 2019 in five cities across both temperate and subtropical regions in China were collected. City-level outdoor temperature and RH from 2013 to 2019 was collected from the weather stations. We first estimated the effective reproduction number (R[SUB]t[/SUB]) of influenza, and then used time-series analyses to explore the relationship between indoor/outdoor RH/absolute humidity (AH) and R[SUB]t[/SUB] of influenza. Furthermore, we expanded the measured one-year indoor temperature and RH data into five years, and used same method to examine the relationship between indoor/outdoor RH and R[SUB]t[/SUB] of influenza.
Results: Indoor RH displayed a seasonal pattern with highs during the summer months and lows during the winter months, while outdoor RH fluctuated with no consistent pattern in subtropical regions. R[SUB]t[/SUB] of influenza followed a U-shaped relationship with indoor RH in both temperate and subtropical regions, while U-shaped relationship was not observed between outdoor RH and R[SUB]t[/SUB]. In addition, indoor RH may be a better indicator for R[SUB]t[/SUB] of influenza than indoor AH.
Conclusion: The findings indicated that indoor RH may be the driver of influenza seasonality in both temperate and subtropical locations in China.
Keywords: China; Influenza; humidity; indoor; outdoor; seasonality.