Influencing factors for latent tuberculosis infection among student close contacts of pulmonary tuberculosis
Objective To investigate the prevalence and influencing factors of latent tuberculosis infection(LTBI)among students close contacts diagnosed with pulmonary tuberculosis in Baoshan District,Shanghai,so as to provide the basis for the prevention and control of pulmonary tuberculosis among students.Methods Pulmonary tuberculosis cases identi-fied among students or teaching staff were selected as index cases through the Surveillance System of Chinese Disease Prevention and Control Information System,school reports,notification of Centers for Disease Control and Prevention from April 2021 to November 2023,and student close contacts in their schools were selected as research subjects.De-mographic information,lifestyle and Mycobacterium tuberculosis test results were collected through questionnaires surveys and pulmonary tuberculosis screening.LTBI was defined as a positive Mycobacterium tuberculosis test result with the ex-clusion of active pulmonary tuberculosis.The influencing factors for LTBI among student close contacts were identified using a multivariable logistic regression model.Results A total of 1 212 student close contacts were included,with 651 males and 561 females,resulting in a gender ratio of 1.16︰1.The mean age was(18.48±4.33)years.Among them,32 cases were detected with LTBI,yielding a detection rate of 2.64%.Higher LTBI detection rates were observed among students who shared the same dormitory with pulmonary tuberculosis cases(9.26%),attended private schools(5.54%),lived on campus(3.54%),and obtained meals through take-out services(6.52%).Multivariable logistic regres-sion analysis showed that sharing the same dormitory with pulmonary tuberculosis cases(OR=3.604,95%CI:1.256-10.338),attending a private school(OR=2.327,95%CI:1.083-5.003),and three meals a day through canteens(OR=9.561,95%CI:2.029-45.057)or through take-out services(OR=19.222,95%CI:3.528-104.732)were associated with a higher risk of LTBI.Conclusion The close contacts of students with pulmonary tuberculosis in Baoshan District are at risk of LTBI,which is mainly affected by the degree of contact with tuberculosis cases,the strength of school epidemic prevention and control,and students'eating habits.
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