Abstract:

To analyze the human intestinal helminth infection in Shandong Province and provide a scientific basis for developing parasite control strategies and measures. The survey was conducted according to the requirements of the National Surveillance Program for Key Human Parasitic Diseases, and 14 survey sites were selected as the investigation points in 9 cities, including Jinan, Qingdao, Weifang, Jining, Linyi, Dezhou, Liaocheng, Binzhou and Heze. Each survey point was assigned to 5 regions in the east, south, west, north and middle according to geographical orientation, and 1 administrative village from 1 neighbourhood was selected in each region for monitoring. At least 200 permanent residents over the age of 3 years were selected from each village. The modified Kato-Katz thick smear method was used to examine parasite eggs (two slide-reading for each sample). Children aged 3 to 9 years in each village were also tested with the cellophane tape anal swab method to examine Enterobius vermicularis eggs. SPSS 21.0 software was used for statistical analysis, and the difference between infection rates was compared with χ² test. A total of 14 507 people were investigated, 45 people were found to be infected with intestinal helminth, the total infection rate was 0.31% (45/14 507). The infection rates of Ascaris lumbricoides, Trichuris trichura, Clonorchis sinensis and E. vermicularis were 0.01% (2/14 507), 0.30% (43/14 507), 0.01% (2/14 507), 0.82% (15/1 832), respectively. The infection rate of intestinal helminth was the highest in Linyi City (4.16%, 42/1 010). The infection rate of Jining City was 0.10% (1/1 014). The infection rates in Qingdao and Weifang were 0.05% (1/2 050, 1/2 115). The difference was statistically significant (χ² = 196.906, P < 0.01). The rates of E. vermicularis infection in Dezhou, Liaocheng, Binzhou and Heze were 0.96% (2/208), 3.00% (3/100), 1.57% (6/382), 2.78% (4/144) respectively, with no significant difference (χ² = 2.536, P > 0.05). The infection rate of intestinal helminth was 0.28% (19/6 805) in males and 0.36% (28/7 702) in females. The infection rate of intestinal helminth in the 19-40 years old group was the highest at 0.40% (12/2 988). The infection rates of intestinal helminth were the highest in primary school and middle school education levels, both of which were 0.41% (18/4 427, 16/3 933). There were no statistically significant differences in intestinal helminth infection rate between different genders, different age groups and different educational levels (χ² = 0.796, 2.837, 5.251; P > 0.05). The highest intestinal helminth infection rate was 0.56% (11/1 970) in students, and there was a significant difference in intestinal helminth infection rate among different occupations (χ² = 23.847, P < 0.01). The infection rate of human intestinal helminth in Shandong Province is at a low level, but there is still a risk of transmission in some areas, and surveillance and prevention should be continued.

Key words: Intestinal helminth, Monitor, Shandong Province