Seeded samples for mailed transport. *, four C. trachomatis (CT) and 4 N. gonorrhoeae (GC) strains seeded with low (L), medium (M), and high (H) titers (each strain had a dry and wet state), total of 48 samples. **, five combinations of C. trachomatis/N. gonorrhoeae, two seeded with a C. trachomatis high/N. gonorrhoeae low titer, two with a C. trachomatis low/N. gonorrhoeae high titer, and one with a C. trachomatis low/N. gonorrhoeae low titer (each had a dry and wet state), total of 10 samples. ***, five controls (negative for C. trachomatis and N. gonorrhoeae) containing PBS (each had a dry and wet state), total of 10 samples.