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Giardia infection status of asymptomatic Giardia-positive dogsa, administered either vaccine or saline at weeks 0 and 3, and Giardia-negative controls.
a Giardia positive = zinc sulphate flotation positive. Two group 1 dogs and 3 group 2 dogs were enzyme-linked immunosorbent assay (ELISA) positive but zinc sulphate flotation negative at day 0.
