Figure 1

Flow diagram of vaccinated and unvaccinated girls who participated in the study. A total of 375 and 425 girls from the vaccinated and unvaccinated districts were present in the schools on the days of the survey. Of those present, 211/375(56.3%) vaccinated and 200/425(47%) unvaccinated girls were recruited in the study. The vaccinated girls were at months 18 post vaccination. In the laboratory, 207/211(98%) and 197/200(98.5%) serum samples from the vaccinated and unvaccinated girls were adequate for analysis respectively.