Poxvirus (Smallpox and Molluscum contagiosum)

A 4-year-old girl is brought to her pediatrician for evaluation of skin lesions. The patient’s mother noticed several bumpy skin lesions on her daughter's arm earlier this week. The patient is currently attending daycare and scraped her knee last week but is otherwise healthy. She has not been exposed to any sick contacts, and none of her family members have similar lesions. Vital signs are within normal limits, and physical examination is notable for the following finding:

 
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These lesions are nontender to palpation. The pathogen responsible for this patient’s clinical presentation was most likely transmitted in which of the following manners?