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At baseline, demographic data and a serum sample were obtained from each study subject.
Antibody concentrations for each serum sample were obtained by reference to the standard curve (N = 8 per point).
For each patient, an acute-phase and a convalescent-phase serum sample were obtained for serologic analysis.
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A second serum sample was obtained from nine patients.
One positive serum sample was obtained from mare.
Pooled human serum sample was obtained from Innovative Research, Inc. (Novi, MI).
One serum sample was obtained from one resident with, and one resident without clinical pertussis.
Paired serum sample was obtained, with permission, on the occasion of concomitant routine venipuncture.
An initial serum sample was obtained from all participants to measure for pandemic influenza antibodies.
The serum sample was obtained after centrifugation at 3000 × g for 10 minutes.
A serum sample was obtained from a total of 456 children.
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