结核病疫情中接触者PPD结果的影响因素研究

Study on the influence factors of PPD in a tuberculosis outbteak

目的了解结核疫情中接触者PPD结果的影响因素,为部队疫情防控提供参考依据。方法对结核疫情中的密切接触者进行流行病学调查和PPD试验并分析结果。结果各学员队的患病人数与阳性率和强阳性率呈正相关性,相关系数分别为0.970和0.964;与患者同宿舍的接触者PPD试验强阳性率为34.48%,高于与患者不同宿舍接触者的强阳性率16.16%,二者差异有统计学意义(χ2=13.9539,P<0.01);有卡瘢组和无卡瘢组强阳性率分别为21.72%和17.09%,差异无统计学意义(χ2=1.0768,P>0.05);居住地在城市的学员强阳性率为16.92%,低于农村的23.81%,差异无统计学意义(χ2=2.812,P>0.05)。结论患病人数和同宿舍居住是接触者PPD结果的影响因素;卡介苗和城乡差异不是其影响因素。

objective To obtain the influence factors of PPD in tuberculosis outbreak, so as to provide the reference for the military epidemic prevention and control. Methods Epidemiological investigation and PPD test was carried out during a tuberculosis outbreak, and the results were analyzed. Results There was a positive correlation between case number and positive rate, strong positive rate(SPR) of PPD, and correlation coefficients were 0.970 and 0.964 respectively. SPR of group lived in the same dormitory with tuberculosis case was 34.48%, while the rate of group not lived in the same dormitory with the case was 16.16%, and there was significant difference between the two groups(χ2=13.9539, P<0.01). SPR of the group with BCG scar and without BCG scar were 21.72% and 17.09%respectively, and there was no significant difference between the two groups (χ2=1.0768,P=0.30).SPR of city and rural students group was 16.92% and 23.81% respectively, and the difference was not significant between two groups (χ2=2.812,P=0.094). Conclusion Case number and same dormitory living experience are influence factors of PPD result. BCG vaccine and city-countryside-differences are not the influence factors.