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Aim   To investigate optochin-resistant viridans group streptococci (VGS) strains isolated from the sputum sample of adult patients with different clinical symptoms.Materials and Methods   Optochin-resistant VGS isolates were identified by matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS).  recA  sequencing was used to confirm identified isolates at the genus level by MALDI-TOF MS.  Finding . We identified 79% of tested isolates (148/187) at the species-level identification using the MALDI-TOF MS tool. We identified that the most common species isolated from sputum specimens were  S. oralis  (44.9%) followed by  S. mitis  (25.7%),  S. infantis  (9.1%),  S. parasanguinis  (7.5%),  S. peroris  (3.7%),  S. anginosus  (2.7%), and  S. sanguinis  (2.1%).  Discussion.  The  S. oralis  strains were majority of optochin-resistant VGS isolates obtained from sputum of adult patients in Jakarta, Indonesia. MALDI-TOF MS showed potential for the rapid identification tool to identify optochin-resistant VGS isolates. Although there were discrepancies in identifying isolates at the genus/species level, the performance could be improved by expanding its database.

Isolation and Identification of Optochin-Resistant Viridans Group Streptococci from the Sputum Samples of Adult Patients in Jakarta, Indonesia