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Abbreviations—IgG: serum immunoglobulin G titers determined by ELISA; Hgb: blood hemoglobin concentration determined; weights: hamsters weighed; Δweights, change in weights after hookworm infection calculated after second weight taken; ΔHgb, change in blood hemoglobin concentrations after hookworm infection calculated after second hemoglobin measurement taken; FECs, overnight fecal egg counts determined.
