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Kinetics of the IgM response against HspX from rLTBI study subjects by indirect ELISA. Negative TST are the OD of the serum samples obtained before the TST conversion and positive TST are the OD at the time of conversion. The lines connects the same person (n = 43). HCW that converted to positive TST presented significantly higher levels of IgM than before conversion (P < 0.001).
