I enjoy working through thought experiments & math models with Perplexity
Especially ones that challenge the dogma rife in IPC World
Especially simple ones that serve as sanity checks
That everyone in IPC World could & should be asking
But aren't
Five or 10 minutes of prompts and interaction can erase 100 years of toxic misinformation
Supported with sources
For example:
The CDC’s estimate and other studies’ findings regarding the significantly higher risk of COVID-19 transmission through inhalation compared to touch are supported by the available evidence.
This substantial difference in transmission risk can be attributed to several factors:
Exposure Levels
1.Inhalation exposure is much higher than touch exposure:
•People inhale approximately 10 billion bacteria and viruses per day through normal respiration.
•In contrast, touch transfer to the T-zone (eyes, nose, mouth) is estimated at only about 1.94 million microbes per day.
2.Airborne concentration:
•Indoor air typically contains 100,000 to 1,000,000 bacteria and virus particles per liter.
•This high concentration in the air we breathe constantly exposes the respiratory system to potential pathogens.
Transmission Efficiency
3.Respiratory system vulnerability:
•The respiratory tract is directly exposed to inhaled particles, making it more susceptible to infection.
•Aerosols can penetrate deep into the lungs, increasing the likelihood of infection.
2.Touch transmission barriers:
•The skin provides a physical barrier against pathogens.
•Transmission via touch requires transfer to mucous membranes, which is less efficient.
Viral Persistence
5.Airborne viability:
•SARS-CoV-2 can remain viable in aerosols for hours.
•This prolonged viability increases the chance of inhalation exposure.
2.Surface viability:
•While SARS-CoV-2 can persist on surfaces, the risk of fomite transmission is considered low.
•Surface contamination plays a less significant role in transmission compared to airborne routes.
Environmental Factors
7.Indoor settings:
•Poor ventilation in indoor spaces can lead to accumulation of airborne viral particles.
•This accumulation increases the risk of inhalation exposure over time.
2.Close proximity:
•Short-range airborne transmission is particularly efficient in close-contact scenarios.
•This efficiency contributes to the higher risk of respiratory transmission.
The vast difference in transmission risk between inhalation and touch routes (10,000:1 to 100,000,000:1) reflects both the higher exposure levels through respiration and the respiratory system’s susceptibility to infection.
The ease of colonization and infection through the respiratory route is indeed a significant factor, as the respiratory tract provides an ideal environment for viral replication and spread.
This understanding emphasizes the importance of measures such as proper ventilation, mask-wearing, and maintaining distance in reducing COVID-19 transmission, while also explaining why surface disinfection, while still recommended, plays a less critical role in prevention strategies.
For more than two years now, CDC's Healthcare Infection Control Practices Advisory Committee (HICPAC) has pushed back against science, the public, HCWs, patients, Long Covid victims, & common sense to introduce better airborne protections for healthcare workers and patients
The last time the guidance for "Airborne, Contact, & Droplet Precautions" was updated was 2007
A lot has changed since then
We now know most diseases are transmitted "through the air"
In fine aerosols
Not large "droplets"
And we face numerous airborne disease threats now
10 voting members of HICPAC determine the risk of airborne transmission to 345 million Americans & 42 million Canadians
Putting at risk every year:
~90% who will interact with healthcare in some fashion