Public health surveillance involves the ongoing collection, analysis, evaluation, and reporting of health-relevant information to improve prevention. Surveillance of occupational health, like other public health endeavors, has been a powerful tool for tracking trends, evaluating the success or failure of interventions, and identifying new problems or the new circumstances where well-known problems are arising. Surveillance data can provide a measure of the extent of a problem and be invaluable in the allocation of scarce prevention resources [1].
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