Viral DNA sequences in peripheral blood and vertical transmission of the virus: a discussion about BPV-1 - Freitas, Antonio Carlos de; Carvalho, Claudemir de; Brunner, Olga; Birgel Júnior, Eduardo Harry; Della Libera, Alice Maria Melville Paiva; Benesi, Fernando José; Gregory, Lilian; Beçak, Willy; Santos, Rita de Cássia Stocco dos (Brazilian Journal of Microbiology, 2003)