We describe 6 cases of meningitis after spinal anesthesia associated with a single anesthesiologist over the course of 5 years. The earliest case occurred in 2000, and the other 5 cases occurred over the course of 14 months in 2004-2005. The case identified in 2000 was culture-positive for Streptococcus salivarius. The other 5 cases were culture-negative for this organism but in 2 cases, the cerebrospinal fluid was found to be positive for bacterial DNA that was identified as belonging to S. salivarius by sequencing of the 16S rRNA gene. The association with a single anesthesiologist and a single hospital during a relatively short interval, however, lead us to believe that these occurrences are part of a series associated with possible violations of aseptic technique.