Transmission of Viruses in Droplets and Aerosols - SmokeFree Tasmania
Transmission of
Viruses in Droplets
and Aerosols
LINSEY C. MARR CHARLES P. LUNSFORD PROFESSOR CIVIL AND ENVIRONMENTAL ENGINEERING VIRGINIA TECH
26 MARCH 2020
Topics
1. Respiratory viruses 2. Transmission modes 3. Size distributions and evaporation 4. Virus aerosol dynamics 5. Impact of temperature and humidity 6. Masks 7. SARS-CoV-2
Linsey Marr, Virginia Tech, March 2020
2
Linsey Marr, Virginia Tech, March 2020
3
Virus Size
influenza SARS-CoV-2
0.1 ?m
0.12 ?m
rhinovirus adenovirus
0.03 ?m
0.1 ?m
, /Vimirgaigneias.Thetcmh,, hMttapr:c/h/rhinovirus4, ,
Size Matters
? Airborne virus is not naked!
respiratory fluid
0.1 ?m
0.5 ?m
? Size determines
(0.2-100 ?m)
? Lifetime in the atmosphere
? Where it deposits in the respiratory system
Linsey Marr, Virginia Tech, March 2020
5
Modes of Transmission
direct contact
indirect contact
Defined as >5 ?m and happening at close-range only ( ................
................
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