Fig. 4From: Transformed Salmonella typhimurium SL7207/pcDNA-CCOL2A1 as an orally administered DNA vaccineStability of transformed strain SL7207/pcDNA-CCOL2A1 during a 22-h continuous culture. a Cell growth curve at OD600. b Log CFU of bacterial broth. c Correlation between bacterial log CFU and OD600. d Plasmid retention rate. CFU could not be determined at 14 or 18 h in b because of irregular plate colony counts following gradient dilutionBack to article page