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Congenital bilateral absence of the vas deferens (CBAVD) accounts for 1%-2% of sterility in men. A high incidence of mutations, as well as the involvement of the 5T variant of the T tract length in intron 8 of the cystic fibrosis conductance regulator (CFTR) gene, have been previously described in males with CBAVD. Herein we report the screening for mutations and for the 5T variant of the CFTR gene in 17 patients with CBAVD and three others with non-CABVD obstructive azoospermia. In the CBAVDdoi:10.1590/s1415-47572003000100001 fatcat:brcc74mndvd25ewjxjdj6bozwu