Author/Authors :
khazaei, salman Department of Biostatistics and Epidemiology - Hamadan University of Medical Sciences , nematollahi, shahrzad Department of Biostatistics and Epidemiology - Tehran University of Medical Sciences , zahiri, ali Center for Disease Control and Prevention - Deputy of Health Services Hamadan University of Medical Sciences , mohamadian- hafshejani, abdollah Department of Biostatistics and Epidemiology - Isfahan University of Medical Sciences , salehiniya, hamid Department of Biostatistics and Epidemiology - Tehran University of Medical Sciences
Abstract :
this cross-sectional study was conducted on all registered smear-positive tuberclosis (tb) patients during a time period of eight years (2005 - 2013); patients with records in the hamadan provincial surveillance database were studied, in order to find secondary attack rate of tb. the contact investigation in 510 clusters resulted in secondary attack rate (sar) of 18.75 per 1000 (95% confidence interval: 1.3 - 38.7) children below the age of 15; sar of 6.7 per 1000 (95% confidence interval: 2.1 - 11.3) adults; and overall sar of 8.14 per 1000 contacts (95% confidence interval: 3.4 - 12.8). we concluded that age and household size had a significant impact on the transmission of tb to household contacts.
