Danger of using an unreliable classification system for preschool wheeze.

Therefore, from a TB transmission perspective it seems less informative to stratify extreme levels of poverty, and more informative to evaluate whether the available epidemiological evidence supports the existence of a threshold effect. Determination of a threshold effect will guide epidemiological thinking and potentially assist in identifying global poverty alleviation targets. Measuring child TB incidence rates as an epidemiological marker of ongoing transmission could be considered in future analyses, once more reliable WHO data becomes available. MYERS et al. [7] have found lower income, ethnicity and immigration status to be significantly associated with child TB incidence in California, USA.