Tidbits:
6:30 Breaks particles into different categories:
Inhalable ≤ 100 microns
Thoracic 10-15 microns
Respirable: ≤ 5 microns
7:50 Comparison to TB & Measles. Neither has been cultured (or it is very difficult) from the air.
11:00 (Guinea pig?) lungs exposed to TB-infected aerosols >5 micron (no impact) or <5 micron(infected)
12:16 where depositional patterns by size is shown for different parts of the airways (Nose breathing. People exercising or panting will have different pattern.)
14:23 Medical vs Exposure science categorization of particles by size
14:45 Settling time in Still Air by particle size (minutes for 1.5m drop)
15:13 Travel distance of droplets in directional air flow to drop 1 meter
5 micron travels 65m in 5cm/s; travels 270m in 20cm/s
20 micron travels 4m " " ; 15m " "
30 micron travels 2m " " ; 5m " "
"2 meter cutoff doesn't make a whole lot of sense from an aerosol physics point of view"
With turbulence, it won't go so far, but will remain suspended longer.
The thermal plume of a human body will carry a 50 micron droplet upward.
16:34 RCT of spread of H3N2 influenza. Had difficulties getting spread as volunteers weren't shedding in aerosols. Minimal shedding in aerosols even though lots of virus in swabs.
Consistent with earlier experiments where aerosols were very infectious.
19:06 SARS & MERS spread by aerosols. The Amoy Gardens outbreak, if I understand him correctly, was an outdoor aerosol that infected people in buildings, depending on which buildings were exposed to the aerosol. (My understanding needs confirmation)
20:04 Patient bedside sampling of SARS-COV-2 show considerable virus in 1-4 micron and >4 micron aerosols.
21:22 Samples of SARS-COV-2 from surfaces & air(on personal samplers)
21:39 The restaurant infection in Wuhan including infection at 4.6m
22:30 1960s experiment that showed the route of the infection affects the severity of influenza.
23:10 Current experiments with Influenza. Cultured from breathing. (~ 1 culturable virus particle per minute)
23:45 Surgical ear-loop Mask vs no Mask source control experiments in 2013. Removed 5+-micron particles; reduced by 2x particles in fine particle size (< 5 micron)
24:30 Similar work on coronavirus cold viruses
25:10 Currently working on this at U of Md for SARS-COV-2
27:00 "[SARS-COV-2] is a lot more like TB than Measles."
28:00 I wouldn't get on an airplane. Talks about the wrong direction of vents in airplanes.
6:30 Breaks particles into different categories:
Inhalable ≤ 100 microns
Thoracic 10-15 microns
Respirable: ≤ 5 microns
7:50 Comparison to TB & Measles. Neither has been cultured (or it is very difficult) from the air.
11:00 (Guinea pig?) lungs exposed to TB-infected aerosols >5 micron (no impact) or <5 micron(infected)
12:16 where depositional patterns by size is shown for different parts of the airways (Nose breathing. People exercising or panting will have different pattern.)
14:23 Medical vs Exposure science categorization of particles by size
14:45 Settling time in Still Air by particle size (minutes for 1.5m drop)
15:13 Travel distance of droplets in directional air flow to drop 1 meter
5 micron travels 65m in 5cm/s; travels 270m in 20cm/s
20 micron travels 4m " " ; 15m " "
30 micron travels 2m " " ; 5m " "
"2 meter cutoff doesn't make a whole lot of sense from an aerosol physics point of view"
With turbulence, it won't go so far, but will remain suspended longer.
The thermal plume of a human body will carry a 50 micron droplet upward.
16:34 RCT of spread of H3N2 influenza. Had difficulties getting spread as volunteers weren't shedding in aerosols. Minimal shedding in aerosols even though lots of virus in swabs.
Consistent with earlier experiments where aerosols were very infectious.
19:06 SARS & MERS spread by aerosols. The Amoy Gardens outbreak, if I understand him correctly, was an outdoor aerosol that infected people in buildings, depending on which buildings were exposed to the aerosol. (My understanding needs confirmation)
20:04 Patient bedside sampling of SARS-COV-2 show considerable virus in 1-4 micron and >4 micron aerosols.
21:22 Samples of SARS-COV-2 from surfaces & air(on personal samplers)
21:39 The restaurant infection in Wuhan including infection at 4.6m
22:30 1960s experiment that showed the route of the infection affects the severity of influenza.
23:10 Current experiments with Influenza. Cultured from breathing. (~ 1 culturable virus particle per minute)
23:45 Surgical ear-loop Mask vs no Mask source control experiments in 2013. Removed 5+-micron particles; reduced by 2x particles in fine particle size (< 5 micron)
24:30 Similar work on coronavirus cold viruses
25:10 Currently working on this at U of Md for SARS-COV-2
27:00 "[SARS-COV-2] is a lot more like TB than Measles."
28:00 I wouldn't get on an airplane. Talks about the wrong direction of vents in airplanes.