Figure 3
a) Infection levels of the study population divided into 2-year age classes with sample sizes as follows 7–8 years old n = 12; 9–10 years old, n = 15; 11–12 years old, n = 28; 13–14 year old, n = 46; 15–16 year old, n = 31; and 17–18 year old, n = 15. The histogram shows infection intensity (log10(x+1) transformed) with bars representing the standard error of the mean, while the line shows infection prevalence.