Evaluation of Two Supplemented Culture Media for Long-Term, Room-Temperature Preservation of Streptococcus pneumoniae Strains

Figure 6

Pneumococcal survival-time curves based on the number of viable CFU of pneumococcal strains: EF28 (serotype 23F), EF33 (nontypeable), H2 (serotype 11), 61 (nontypeable), and S. pneumoniae ATCC 49619 strains stored on TH-SYC agar, along test 2 (the number of viable CFU at 16 wk was 2+ for EF28, H2, and 61 strains and 3+ for ATCC and EF33 strains). CFU (+): the number of CFU was expressed as crosses of growth in the recovery plate. TH-SYC: Todd-Hewitt/Skim-Milk/Yeast/Charcoal.