| relevance of moldy fungi as agents of chronic lower respiratory tract infection in patients seen in maiduguri, nigeria. | in maiduguri, nigeria in the 1990's, we had available to us only the direct acid fast bacilli (afb) smear method to diagnose tuberculosis (tb), and no facility for tb culture. because the clinical and radiologic manifestations of lower respiratory tract (lrt) fungal infections are difficult to differentiate from those of lrt tb, it was not clear how many of the direct afb smear negative patients had fungal infections, or were true negatives for tb. | 2007 | 17939312 |