What Does it Mean for a Virus to Be “Airborne”?

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What does it mean when a virus is airborne? It turns out it's more than just what comes out when you sneeze

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Sources:

COVID-19 airborne lifetime (2020)
https://www.pnas.org/content/pnas/117/22/11875.full.pdf
Transmission of COVID-19 virus by droplets and aerosols (2020)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293495/
Recognition of aerosol transmission of infectious agents: a commentary (2019)
https://bmcinfectdis.biomedcentral.com/articles/10.1186/s12879-019-3707-y
Opinion letter
https://academic.oup.com/cid/article/doi/10.1093/cid/ciaa939/5867798?searchresult=1
Measles info for CDC
https://www.cdc.gov/measles/hcp/index.html
Human cough as jet propulsion
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169235
Couple of downloadable open access videos of droplet visualization experiments that accompanies the 2020 PNAS paper.
https://zenodo.org/record/3770559#.XxdG0PhKhTZ
WHO Transmission of SARS-CoV-2
https://www.who.int/news-room/commentaries/detail/transmission-of-sars-cov-2-implications-for-infection-prevention-precautions
Natural Ventilation for Infection Control in Health-Care Settings. Annex C. https://www.ncbi.nlm.nih.gov/books/NBK143281/
Indirect Person to Person Transmission https://sphweb.bumc.bu.edu/otlt/MPH-Modules/PH/PH709_Transmission/PH709_Transmission4.html
Is the coronavirus airborne? Experts can’t agree https://www.nature.com/articles/d41586-020-00974-w
Aerosol Transmission of Infectious Disease https://journals.lww.com/joem/Abstract/2015/05000/Aerosol_Transmission_of_Infectious_Disease.4.aspx
Estimation of airborne viral emission: Quanta emission rate of SARS-CoV-2 for infection risk assessment https://pubmed.ncbi.nlm.nih.gov/32416374/
Factors involved in the aerosol transmission of infection and control of ventilation in healthcare premises https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114857/
Transmission of Ebola Viruses: What We Know and What We Do Not Know https://mbio.asm.org/content/6/2/e00137-15
Airborne bacteria and viruses https://www.jstor.org/stable/43421049?seq=1
DoH Measles Info https://www1.health.gov.au/internet/main/publishing.nsf/Content/measles.htm
Transmission of SARS-CoV-2 https://www.who.int/news-room/q-a-detail/q-a-how-is-covid-19-transmitted
https://www.who.int/news-room/commentaries/detail/transmission-of-sars-cov-2-implications-for-infection-prevention-precautions