Investigation of rash outbreak caused by larvae of Euproctis bipunctapex in a residence community in Pudong New Area,Shanghai,China,2023
Objective To explore the cause of and risk factors for an clusters of unexplained rashes of residents occurred in a residence community in Pudong New Area,Shanghai,China in 2023.Methods Case studies were conducted on symptomatic residents in July 2023.Environmental surveys were carried out on the community.Epidemiological characteristics of cases were described.Meanwhile,case-control studies were conducted,and pest species were identified.SPSS 26.0 software and Chi-square test were used to statistically analyze the data of different groups.Univariate logistic regression analysis was used for risk factor analysis.Results A large number of Lepidoptera larvae were found on the Chinese tallow trees and street lamps in front of the building where the cases gathered,and they were identified as Euproctis bipunctapex.The body part with the highest incidence rate of rashes was the upper limbs (84.34％),and that with the lowest incidence rate of rashes was the head and face (7.23％).The attack rates of rashes among residents living less than 50 meters,between 50 meters and 100 meters,and greater than 100 meters away from allergens were 81.32％,75.00％,and 25.00％,respectively,with significant differences (x2=26.407,P<0.001).The highest attack rate was observed in the age group of>60 years,followed by the age groups of>50-60 years and>20-30 years.Staying within 50 meters away from allergens[odds ratio (OR)=14.79,95％ confidence interval (CI ):5.73-38.17,P=0.001]and drying quilts and clothes in the open space of the community in the last month (OR=2.37,95％ CI:1.05-5.36,P=0.038) were risk factors for rashes.Conclusions This clusters of unexplained rashes that occurred in residents in a residence community in Pudong New Area,Shanghai in 2023 is an outbreak of allergic rash caused by larvae of E.bipunctapex,whose poisonous hairs are dispersed by the wind and cause allergic rashes in contact with human skin.Drying quilts within the dispersing range of the poisonous hairs of larvae of E.bipunctapex also causes allergic rashes.
Clusters of rashEuproctis bipunctapexOutbreakField epidemiology
万方数据
维普
