Article abstract: Introduction: Pulmonary tuberculosis is one of the oldest and most well- known human diseases which have been with man since ancient times. The incidence of TB has been increasing over the past decades. The aim of this study was Epidemiological investigation of pulmonary tuberculosis in Urmia during 2004-2007.
Methods: The data for this deh1ive-analytic study was obtained from TB patients documented files diagnosed during 2004-2007. The data were analyzed using SPSS and WinPepi software.
Results: According to the findings of this study 248 Pulmonary TB patients (151 positive smears and 97 negative smears) were diagnosed during 2004-2007 (four-year incidence rate= 29.54 per 100000). 66.1% of the patients (164 persons) were males and 33.9% (84 persons) were females. The incidence rate of 6.55 in 2004 increased to 8.2 in 2007; this increase was not statistically significant however (Trend P.V=0.22).
Conclusion: The results of the study indicate that incidence rate of positive smear TB was higher than that of negative smear TB and disease incidence rate increased in the four- year period.