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Zinc levels in the sera (6-month follow-up); point 1, pre-vaccination (baseline); point 2, 14 days after primary vaccination; point 3, one month after primary vaccination; point 4, two months after primary vaccination; point 5, three months after primary vaccination; and; point 6, six months after primary vaccination; * significant difference in sera levels before and six months after the first vaccination; (*P < 0.05).
