Study of surveillance data for class B notifiable disease in China from 2005 to 2014.
BACKGROUND
The surveillance of infection is very important for public health management and disease control. It has been 10 years since China implemented its new web-based infection surveillance system, which covers the largest population in the world.


METHODS
In this study, time series data were collected for 28 infectious diseases reported from 2005 to 2014 . Seasonality and long-term trends were explored using decomposition methods. Seasonality was expressed by calculating the seasonal indices. Long-term trends in the diseases were assessed using a linear regression model on the deseasonalized series.


RESULTS
During the 10-year period, 38 982 567 cases and 126 372 deaths were reported in the system. The proportion of deaths caused by AIDS increased from 12% in 2005 to 78% in 2014. There were six diseases for which the seasonal index range was greater than 2: dengue fever, Japanese encephalitis, leptospirosis, anthrax, cerebrospinal meningitis, and measles . Among the 28 diseases, the incidence of syphilis increased fastest, with an average increase of 0.018626/100 000 every month after adjustment for seasonality.


CONCLUSIONS
Effective surveillance is helpful in gaining a better understanding of the infection behaviour of infectious diseases; this will greatly facilitate disease control and management.
Department of Epidemiology and Health Statistics, West China School of Public Health, Sichuan University, No. 17 Section 3, South Renmin Road, Chengdu, Sichuan 610041, PR China; Department of Anatomy with Radiology, University of Auckland, Auckland, New Zealand.
Xingyu
X
Zhang
School of Public Health, Sun Yat-sen University, Guangzhou, Guangdong Province, PR China; Sun Yat-sen Global Health Institute, Institute of State Governance, Sun Yat-sen University, Guangzhou, Guangdong Province, PR China.
Fengsu
F
Hou
Department of Epidemiology and Health Statistics, West China School of Public Health, Sichuan University, No. 17 Section 3, South Renmin Road, Chengdu, Sichuan 610041, PR China. Electronic address: lixiaosong1101@126.com.
Xiaosong
X
Li
Sichuan Centre for Disease Control and Prevention, Sichuan, China.
Lijun
L
Zhou
Department of Epidemiology and Health Statistics, West China School of Public Health, Sichuan University, No. 17 Section 3, South Renmin Road, Chengdu, Sichuan 610041, PR China.
Yuanyuan
Y
Liu
Department of Epidemiology and Health Statistics, West China School of Public Health, Sichuan University, No. 17 Section 3, South Renmin Road, Chengdu, Sichuan 610041, PR China. Electronic address: scdxzhangtao@163.com.
Tao
T
Zhang
D002681:China / Q000453:epidemiology; D057225:Data Mining; D006801:Humans; D017053:Infection Control; D007239:Infections / Q000453:epidemiology*; D008962:Models, Theoretical; D011159:Population Surveillance / Q000379:methods*; D012621:Seasons; D018571:Sentinel Surveillance
Infectious disease; Long-term trend; Seasonality; Time series