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Jeff Gilchrist Profile picture
@jeffgilchrist
Jun 21, 2022 • 8 tweets • 3 min read • Read on X
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COVID-19: Comic and video explanation of transmission

Multiple years into the pandemic and many still don't understand how the airborne transmission of respiratory viruses like COVID-19 work. 🧵1/
The Aerosol Science Research Center in Taiwan has put together an explainer comic and video for people to more easily understand ( aerosol.nsysu.edu.tw/en/scopes/108 ). 2/
The youtube video can be found here ( ). 3/
Hopefully this will help people understand that being in a closed meeting room of people for multiple hours with people spaced exactly 2m apart is not sufficient to prevent transmission from a virus that travels in the air. 4/
With poor ventilation those virosols (virus-laden aerosols) can remain in the air for hours so you might even get infected by someone who was in the previous meeting and is not even there any more. 5/
Surface cleaning does *not* stop airborne transmission and physical barriers like plexiglass can actually disrupt air flow and trap higher concentrations of aerosols making things worse. 6/
How do you reduce the chance of airborne transmission?
- improve ventilation & air filtration
- wear mask with proper fit (N95 or better)
- avoid clustering
- keep physical distance (2m is not sufficient for aerosols)

7/
"We are exposed to massively more pollutants, toxins, and pathogens via air than food and water." so fixing and improving air quality helps with so much more than just COVID-19 ( ). Image by @akm5376 8/

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More from @jeffgilchrist

Jeff Gilchrist Profile picture
Jun 1
*** Ontario Virus Update | June 1 ***

Hospitalizations due to COVID have decreased from 38 to 21 in the last update. Influenza hospitalizations decreased from 51 to 44 and RSV decreased from 20 to 18 so moving in the right direction but still not finished for the season yet. 1/ This stacked bar chart displays weekly new hospitalizations in Ontario specifically attributed to COVID-19, Influenza, and RSV. The data tracks the fluctuating volume of patients over time, highlighting seasonal surges and the relative contribution of each respiratory virus to the overall healthcare burden.
Looking at age groups, those age 75+ had the highest rates of hospitalization due to COVID but decreased since last update. Tied for second place are the 0-4 and 65-74 age groups. 2/ This 100% stacked area chart illustrates the weekly proportion of COVID-19 hospital admissions per 100,000 population in Ontario across different age groups. The graph visualizes how the relative distribution of hospitalizations shifts over time among demographics ranging from infants to seniors aged 75 and older.
COVID case rates decreased across most age groups this past update except for age <1 which had a significant increase and almost matching the same levels as age 80+. The 1-4 and 60-79 age groups currently have the same rates. 3/ This multi-line graph tracks the weekly rate of COVID-19 cases per 100,000 population in Ontario, categorized by various age groups from infants to seniors aged 80 and older. The data trends highlight the fluctuations in infection rates across different demographics over the year.
Read 10 tweets
Jeff Gilchrist Profile picture
May 30
Filtering the air may help prevent your own infection from becoming more severe

If everyone in a household becomes infected with the same virus, does it help to isolate from each other and can you be a danger to yourself? Read on to find out...🧵1/

#AirQuality #IAQ #Ventilation This grouped bar chart, titled "COVID Positive Abnormal Chest CT by Air Quality Setting", displays the percentage of abnormal chest CT scans among COVID-positive patients across three different tiers of air quality control. The graph compares overall and asymptomatic cases, illustrating a clear downward trend in the percentage of abnormal scans as air filtration and ventilation efficiency improve from household levels to high-efficiency aerosol control.
An interesting hypothesis-generating study was published recently that asked if an infected person's condition can become even worse by re-inhaling their own virus particles ( ). 2/sciencedirect.com/science/articl…
Is a transition from a milder upper respiratory tract infection (runny nose, sore throat) to a more severe lower respiratory tract infection like pneumonia is significantly driven by the physical mechanism of inhaling virus containing aerosols deep into the lungs? 3/
Read 26 tweets
Jeff Gilchrist Profile picture
May 24
*** Ontario Virus Update | May 24 ***

Hospitalizations due to COVID have increased from 34 to 38 in the last update. Influenza hospitalizations decreased from 57 to 51 and RSV decreased from 33 to 20. 🧵1/

#Ontario #Virus #COVID #RSV #Influenza #Hospital This stacked bar chart displays weekly new hospitalizations in Ontario specifically attributed to COVID-19, Influenza, and RSV. The data tracks the fluctuating volume of patients over time, highlighting seasonal surges and the relative contribution of each respiratory virus to the overall healthcare burden.
Looking at age groups, those age 75+ had the highest rates of hospitalization due to COVID but decreased since last update. Second place is age 65-74 which increased, and third place is age 0-4 which also increased. 2/ This 100% stacked area chart illustrates the weekly proportion of COVID-19 hospital admissions per 100,000 population in Ontario across different age groups. The graph visualizes how the relative distribution of hospitalizations shifts over time among demographics ranging from infants to seniors aged 75 and older.
COVID case rates were fairly stable across age groups this past update except for age 80+ which had a significant decrease but still maintain the highest rates. The 0-4 and 60-79 age groups currently have similar rates. 3/ This multi-line graph tracks the weekly rate of COVID-19 cases per 100,000 population in Ontario, categorized by various age groups from infants to seniors aged 80 and older. The data trends highlight the fluctuations in infection rates across different demographics over the year.
Read 10 tweets
Jeff Gilchrist Profile picture
May 10
*** Ontario Variant Update | May 10 ***

In Ontario, the NB.1.8.1.* "Nimbus" variant family shot to 74.7% of sequenced genomes from COVID tests while the XFG.* "Stratus" family dropped to 15.8% and the BA.3.2 "Cicada" family decreased below 10% again.🧵1/
#Ontario #COVID #Variant This multi-line chart tracks the lineage frequency of various COVID-19 variant families in Ontario over time, based on sequenced genome samples. The graph illustrates the changing prevalence of specific variant families, showing how different lineages compete and evolve as the dominant strains within the province.
Ontario released another month of sequencing data by age and we continue to see high ratios of Cicada in children with another 51 BA.3.2.2.* sequences out of 617 new sequences ( ). 2/publichealthontario.ca/-/media/docume…
With 126 Cicada sequences from 1,828 total, we see children still have the highest proportion which decreases after age 5-11 as age increases with significant drops from age 60+. 3/ This bar chart illustrates the percentage of the BA.3.2.* Cicada COVID-19 variant lineage among different age groups in Ontario over a designated time period. The graph visualizes the relative prevalence of the lineage across demographics, highlighting how the variant is distributed from young children to seniors aged 80 and older.
Read 11 tweets
Jeff Gilchrist Profile picture
Apr 28
*** Ontario Variant Update | Apr 28 ***

There was some competition for variant dominance during the month of March but the NB.1.8.1.* "Nimbus" family currently holds first place with 49.5% while the XFG.* "Stratus" family sits at 38.1% of sequenced genomes from COVID tests. 🧵1/ This multi-line chart tracks the lineage frequency of various COVID-19 variant families in Ontario over time, based on sequenced genome samples. The graph illustrates the changing prevalence of specific variant families, showing how different lineages compete and evolve as the dominant strains within the province.
The BA.3.2 "Cicada" family has been slowing climbing and now above 10%. 2/
Looking at specific variants, RC.5 Nimbus currently holds first place at 13.4%, SH.1 Nimbus is a close second at 13.3%, RC.6 Nimbus is making a comeback at 11.3%, XFG.1.1.2 Stratus is at 8.2%, RT.2 Cicada at 7.2%, PQ.2.1 Nimbus at 5.2%, and RE.1.2 Cicada at 2.1%. 3/ This multi-line chart tracks the lineage frequency of emerging COVID-19 subvariants in Ontario over time, based on genomic sequencing data. The graph visualizes the shifting percentage of total cases represented by each specific lineage, highlighting the growth and competition of various viral strains.
Read 10 tweets
Jeff Gilchrist Profile picture
Apr 13
*** Ontario Virus & Variant Update | Apr 13 ***

Hospitalizations due to COVID have gone down from 153 to 123 in the last update. Influenza hospitalizations decreased from 59 to 47 and RSV decreased from 110 to 85. 🧵1/

#Ontario #Virus #Variant #COVID #RSV #Influenza #Hospital Graph of New hospitalizations in Ontario due to COVID, Influenza or RSV.
Looking at age groups, those age 75+ had the highest rates of hospitalization due to COVID but decreased since last update. Second place is age 0-4 and their levels are currently increasing while age 65-74 has the third highest rate and also decreased since last update. 2/ Graph of New hospitalization rate in Ontario due to COVID by age group (100% Stacked).
The youngest age group 0-4 currently have a hospitalization rate due to COVID that are 17x higher than age 5-17, 17x higher than age 18-49, and 2.8x higher than adults 50-64. 3/
Read 25 tweets

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