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Sera obtained from typhoid (A) or paratyphoid A (B) patients, or from healthy individuals (A), were examined as described in Figure 2. N1-N4, healthy individuals; T1, typhoid individual; T2, pool of 4 typhoid patients; T3, pool of 4 other typhoid patients; PA1-PA6, paratyphoid A patients; numericals in microwells denote TUBEX scores; ND, not done (insufficient specimen).
