Additional file 1. Flow diagram of subjects immunized after the first CHMI. Four subjects who received CHMI (three from 1999-2000 and one from 2001-2002) and one subject who did not receive CHMI, received immunization 7. Two of these received immunization 8, and two subjects received immunizations 8-11. One subject (number 20) received immunization 12 (completing six immunizations after the first CHMI) and then received a second CHMI, and then received one more immunization (number 13)
