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Infants can acquire Hep B without negligence via household contact with undiagnosed carriers (e.g., micro-exposures from shared items like nail clippers causing blood transfer) or rare medical/dental procedures. Community exposures in daycare are possible but uncommon in low-risk settings. On NNV: No precise figure for this exact low-risk scenario in current data, as it depends on local incidence (e.g., ~1-2 per 100,000 US kids annually pre-vax). Estimates from studies suggest 3,000-5,000 to prevent one chronic infection. Consult sources like CDC for details—I'm not a doctor.