Figure 1. Timeline of the vaccinia cluster, Maryland, USA, 2008. The photo of case-patient 1’s skin lesions was taken on ≈day 8 of illness (courtesy of R. Reddy). The photo of case-patient 2’s skin lesions was taken ≈3 weeks after lesion onset (courtesy of K. Russo). Blue shading, case-patient 1; yellow shading, case-patieint 2; green shading, case-patient 3. CDC, Centers for Disease Control and Prevention; Ig, immunoglobulin; DHMH, Department of Health and Mental Hygiene.