Milton, D. (2012). What was the Primary Mode of Smallpox Transmission? Implications for Biodefense. Frontiers in Cellular and Infection Microbiology. 2:150.
Based on a review of existing data and knowledge on smallpox, the author examines whether traditional modeling based primarily on transmission to close contacts via large droplets fully accounts for the possibility of transmission via airborne droplet nuclei through mechanically-recirculated air in the modern built environment.