Epidemiological Characteristics of Bacillary Dysentery in Lanzhou City(2006-2017)

Objectives To master the epidemiological characteristics of bacillary dysentery in Lanzhou City from 2006 to 2017, and to provide the evidence for scientific prevention and control measures to reduce transmission risks.

Methods Epidemiological characteristics of reported cases of bacillary dysentery in Lanzhou City from 2006 to 2017 were analyzed.

Results In 2006-2017, 36 336 cases of bacillary dysentery were reported in Lanzhou City. The annual reported incidence ranged from 40.58/100 000 to 164.01/100 000, and the average annual reported incidence was 94.30/100 000. All the age groups suffer the disease. In the 0-year-old group, 8 334 cases were reported, accounting for 22.94%. The number of male cases in each age group was higher than that of females. There were 20 298 male patients, accounting for 55.86%, 16 038 females, accounting for 44.14%, and the male-female ratio was 1.27:1. Among different occupational groups, there 11 450 scattered children accounted for 31.51%, 6 536 students, accounting for 18.06%, and 3 472 farmers, accounting for 9.56%. Cases were reported every month. The incidence increased from January to August, and the annual reported cases reach the peak incidence in August. The number of reported cases was 7 396, accounting for 20.35%. The incidences from August to December were decreased month by month. There were 1 143 cases reported in December, accounting for 3.15%.

Conclusions From 2006 to 2017, the incidence of bacillary dysentery in Lanzhou City basically increased from January to August, and it showed a monthly decreasing trend from September to December. Infants with 0~years old and scattered children are the key affected population; summer is the high-risk season; schools and nurseries and kindergartens were the key prevention and control places. It is suggested that sanitation education should be actively carried out for key populations and key places in the high-incidence period, bacillary dysentery disease prevention and health education should be done well as well as daily monitoring and bacillary dysentery disease detection to reduce the incidence and risk of disease transmission.