Figure 2 gives a regional breakdown of sites within vehicles that were positive for bacterial contamination before and after cleaning. From this figure, it can be seen that vehicles sampled
in region A had the greatest number of sites positive for bacteria (78.6%) before cleaning. After cleaning, however, this region (A) showed the most dramatic reduction in the number
of contaminated sites (32.1%) compared with other regions. Interestingly, cleaning of vehicles in both other regions (B and C), had little overall impact on the level of contamination,
although vehicles in region C had the lowest numbers of contaminated sites before and after vehicle cleaning (fig 2).