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The level of antibodies to smallpox vaccine depending on the age cohort (A) and the titer of the VNA (B). (A) shows significant differences in IgGs level between samples from 46-65 years old people and 66-80 years old people (Mann Whitney criterion). Whiskers shows maximum and minimum. (B) shows VNA titer ratio in 46-65 and 66-80 years old. p=0.333 (exact Fisher’s test).
