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Citric acid inhibits K. pneumoniae growth and CPS levels. K. pneumoniae NTUH-K204 or CG43S3 cocultured with different concentrations of citric acid, as indicated, and the growth curve (a) as well as the CPS levels (b) were measured. Bacteria were grown in LB broth at 37°C with agitation. *, P < 0.05 compared to the indicated group.
