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Chronological description of the hypothetical relationship between tuberculosis cases in a call centre in Milan (Italy) from 2006 to 2011; epidemiological and genotype links identified between cases, number and percentage of workplace contacts investigated for each case and number of latent tuberculosis infection cases diagnosed. N.CT, Number of co-workers tested; N.TST+, Number of positive TST results; * link established by genotyping; ** epidemiological link.
