What was the primary #mode of #smallpox #transmission? Implications for biodefense, https://pubmed.ncbi.nlm.nih.gov/23226686/
Although, "respiratory #droplet" transmission was generally regarded as the primary mode of transmission, the relative importance of large ballistic droplets and fine #particle #aerosols that remain suspended in air for more than a few seconds was never resolved.
''Current #recommendations for control of secondary smallpox #infections emphasize transmission “by expelled #droplets to close contacts (those within 6–7 feet)” (Centers for Disease Control, 2002, 2003). Recommendations include vigilant maintenance of standard, droplet, and #airborne precautions. However, emphasis on spread via large droplets may reduce the vigilance with which more difficult airborne precautions are maintained.''