Post-pH effect in oral streptococci Castillo, A. Rubiano, S. Gutiérrez Fernández, José Hermoso, A. Liébana, J. Objectives: To study the post-pH effect (PpHE) in 11 strains of oral streptococci belonging to Streptococcus sanguis, S. mitis, S. gordonii, S. mutans and S. sobrinus by using the BacT/Alert microbial detection system. Methods: The bacterial cultures were exposed to a different pH (3.6, 4.0, 4.6, 5.0, 5.6, 7.0, 7.5, 8.0 and 8.6) for 1 h, and then returned to a neutral medium. The automated BacT/Alert system determined resumed microbial growth by measuring CO2 generation. The PpHE expresses the time difference between resumed growth (after pH shock) and optimal growth (pH 7.0 used as the control). Results: PpHE was found to be minimal for alkaline pH values, and to be strain and species dependent. Conclusions: The PpHE may be useful as an ecological determinant or as an indicator of the cariogenicity of oral streptococci. 2024-03-15T12:03:01Z 2024-03-15T12:03:01Z 2000-03 journal article Castillo A, Rubiano S, Gutiérrez J, Hermoso A, Liébana J. Post-pH effect in oral streptococci. Clin Microbiol Infect. 2000 Mar;6(3):142-6. https://hdl.handle.net/10481/90022 10.1046/j.1469-0691.2000.00030.x eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Clin Microbiol Infect