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The bus driver and fare collector activities involve various risks to workers' health, including exposure to Whole-Body Vibration (WBV). This study aims quantify the exposure levels to the WBV, identify the significant variables associated with low back pain (LBP) and determine the prevalence of LBP in the last 12 months among these workers in the city of Itajubá, Brazil. Methods. A questionnaire was applied to 33 workers to get socio-demographic data, information related to the working environment and health. The WBV exposure assessment was conducted. The logistic regression was used to obtain the adjusted Odds Ratio (OR). The prevalence of low back pain was 18.2%. The highest values of the vibration acceleration referred to [A(8)z] value, for both groups of workers. For fare collectors, there are also relevant risk on the y direction [A(8)y]. In the multivariate analysis it were considered significant: weighted acceleration on the y axis - awy (OR = 1.18 95% CI 0.99-1.42) and occupation (bus driver) (OR = 0.013 95% CI 0.0003 to 0.61). These workers are exposed to important vibration levels. The fare collectors are subject to a greater low back pain risk. The results may contribute to the improvement in the workstation and the working process of the bus drivers and fare collectors. [ABSTRACT FROM AUTHOR]

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