Figure 3.

Gram-negative lactose-fermenting bacteria load (A), and mean prevalence of antimicrobial-resistant, Gram-negative lactose-fermenting bacteria (B), in milk samples from Maasai and Arusha households

Milk was not sampled in Chagga households because initial models did not identify milk consumption as a risk factor. Figure 3A is based on 167 milk samples from 80 Maasai and 30 Arusha households. Data for figure 3B are the number of households. Error bars in 3B represent SE. Milk from Maasai households harboured significantly (according to single-factor multivariate ANOVA) more ciprofloxacin-resistant (p<0·0001), sulfamethoxazole-resistant (p=0·003), tetracycline-resistant (p=0·03), and trimethoprim-resistant (p=0·001) bacteria than that from Arusha households. CFU=colony-forming units.