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Historic observations suggest that survivors of smallpox maintained lifelong immunity and protection to subsequent infection compared to vaccinated individuals. Although protective immunity by vaccination using a related virus (vaccinia virus (VACV) strains) was the key for smallpox eradication, it does not uniformly provide long term, or lifelong protective immunity (Heiner et al., 1971). To determine differences in humoral immune responses, mice were inoculated with VACV either systemically, using intranasal inoculation (IN), or locall