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Yellow fever (YF) virus-specific neutralizing antibody geometric mean titers (GMT) following YF vaccination, by YF virus immunoglobulin M (IgM) status at 3–4 years postvaccination. Serum collected at 2, 7, 9, 11, and 14 days, 1 month, 3 months, and 3–4 years postvaccination
