Epidemiological and clinical features of 139 patients with tuberculosis at a teaching hospital in Italy (Pisa, 1996-2000)

Abstract

In order to describe epidemiologic and clinical features of patients with tuberculosis (TB) identified recently in the hospital of Pisa (Tuscany, Italy), a retrospective study of all cases of TB notified to the Local Public Health Service during January 1996-December 2000 was performed. The diagnosis of TB was made following the criteria of the WHO. A total of 139 patients affected by TB were identified. Diagnosis was microbiologically proved in 81 patients. Mean age was 53.8+/-20.5 S.D. yrs. Thirty-five (25.2%) patients were extra European community citizens (mostly from Africa). The incidence of TB (N/100.000) was 8.4 in 1996 and 6.8 in 2000. Sixty-eight point three per cent of patients had pulmonary TB, 24.5% extrapulmonary and 7.2% mixed TB. The rate of extrapulmonary TB was 15.9% and 39.2% in the 1996-98 and in the 1999-2000 periods, respectively (p = 0.002). Extrapulmonary TB was more frequent in extra European community citizens (42.8%) than in Italian ones (18.3%), p = 0.003. Seven patients were presenting also advanced HIV infection. Microscopic examination for acid fast bacilli in sputum or bronchial secretion resulted negative in 17.4% of proved pulmonary TB (positive culture for Mycobacterium tuberculosis). The chest x-rays showed pleural effusion in 19 patients. Pulmonary cavitation was documented in 15 patients with negative chest x-rays. Fever was not present in 42.4% of the patients at the moment of diagnosis. Three point eight percent of the isolated strains of M. tuberculosis were in vitro multidrug-resistant. The data presented showed an important rate of TB in Pisa. We have yet to understand if the decreased rate observed in 2000 represents a new trend as reported in other North American and European countries. The rate of extrapulmonary TB shows a trend to increase accordingly to recent literature. The isolation rate of multidrug-resistant strains of M. tuberculosis in Pisa seems to be similar to the rates reported in other areas of Europe.