Figure 2From: Prospective evaluation of a complex public health intervention: lessons from an initial and follow-up cross-sectional survey of the tuberculosis strain typing service in England Self-reported knowledge of strain typing. Self-reported knowledge about how to use strain typing was scored on a scale of 1 to 5, where 1 represented ‘no knowledge’ and 5 represented ‘excellent knowledge’. Dark bars represent responses to the initial survey and light bars represent responses to the follow-up survey.Back to article page