Objective: To explore the intra class transmission pattern of acute hemorrhagic conjunctivitis (AHC) among students, so as to provide a basis for formulating precise prevention and control strategies. Methods: The data of AHC students in 2023 was obtained from the teacher-student health information module of the "Xiamen i-Education" platform. Taking the onset date from January 1st to December 31st, 2023 as the search criteria, the epidemiological data of confirmed AHC cases among students in the whole city in 2023 was collected. And the Knox test method was employed to quantify cluster risk at the class level. Subgroup comparisons were conducted to examine differences in cluster risk between academic stages and gender combinations. Cross analysis was performed to investigate the interactive effects of two characteristics on cluster risk. Results: In 2023, 708 cases of AHC students were reported in Xiamen, among which 54 class clustered outbreaks were identified. These outbreaks accounted for 40.54% of total cases. Among them, the incidence of class clustered outbreaks with male first onset cases was higher than that with female first onset cases ( χ 2=4.55, P <0.05). The class cluster risk was at a relatively high level within the incubation period (0-2 d) after AHC onset ( RR =4.61-6.43, P <0.05). Subgroup analysis revealed that female-female case pairs had a higher class cluster risk ( RR = 4.81- 10.29) compared to other gender combinations ( P <0.05). Primary school case pairs showed a higher risk ( RR =4.60-6.77) than middle school case pairs ( RR =3.85-4.57) (both P <0.05). Cross analysis indicated that primary school and female-female combinations had a higher risk ( RR =4.70-11.24) than other combinations, while middle school and male-female combinations showed a positive interaction ( RR =3.68-6.68)(both P <0.05). Conclusions AHC infection among students is primarily transmitted within classes. Gender and educational stage are key demographic factors influencing class cluster transmission risks. Transmission risks should be assessed by analyzing population characteristics and contact patterns, and targeted interventions should be implemented.

Objective:To analyze the transmissible characteristics of imported COVID-19 cases in Xiamen.Methods:The nasopharyngeal swabs and serum specimens were collected from inbound passengers on the same flight. The nucleic acid and antibodies to SARS-CoV-2 were detected respectively. The type of COVID-19 was determined according to the condition. The mode of transmission was analyzed according to the incidence and laboratory diagnosis of positive cases, and seats of cases on the plane.Results:Five cases of common type, 3 cases of mild type and 1 case of asymptomatic infection were found in the same Russian flight. Three cases, 5 cases, 1 case and 1 case were detected for nucleic acid on November 21, 22, 25 and 26, 2020. The whole genome sequence was obtained in 3 cases and 85% in 1 case. According to epidemiology, evolutionary characteristics of virus genome, Results of qPCR and antibody and case seating, the risk of transmission in aircraft cabin was analyzed.Conclusions:This is COVID-19 cases reports of inbound personnel in aircraft, and there is a risk of transmission in the cabin. The imported cases were isolated timely and effectively with the whole closed-loop. No other cases of infection occurred. This report provides a reference for the detection and prevention of transmission of cases imported by aircraft.