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Andre Henriques Profile picture
Andre Henriques
@ScientistAndre
Engineer, Researcher @CERN. Passionate for fundamental science. Advocate for science-driven policies. Views my own 🇨🇦🇵🇹
Jul 21 • 9 tweets • 3 min read
📢🚨 Big update for healthcare & community mask users! 😷

The new EN 14683 standard (v2025) on medical masks just dropped with key updates.
Let's dive into the changes 🧵👇
⚠️ TL;DR: Medical (surgical) masks are NOT PPE! They are designed to protect others, not wearers. 0/ 🔍 What's new in EN 14683:2025?
- Clearer design specs: Ensures masks meet consistent quality standards.
- Defined use cases: Specifies when & where medical masks are appropriate.
- Transparent masks option included: Supports accessibility for lip-reading & communication.
- User info annex: Practical guidance for proper mask use.
- Rationales annex: Explains the science behind testing methods (I personally like this one)
Jan 19 • 12 tweets • 4 min read
📈 CO2 fitting algorithm now available in ARIA ! 📉


Can’t quite figure out the ventilation rate in your space? But you happen to have a CO2 sensor? No worries, we have you covered…
🧵partnersplatform.who.int/aria Algorithm provides a prediction on the room’s environmental conditions by estimating the occupants’ equiv exhalation rate and the ventilation profiles.
Requires: CO2 data, room volume, occ profile, and the ventilation transition times (time at which the vent cond in the room might have changed).
/2
Nov 23, 2024 • 12 tweets • 3 min read
🦠"Can we use viral receptor mapping and particle deposition models to predict the clinical severity of novel airborne pathogens?"

Our newest commentary published in @CMIJournal:


H/T @KineshtaP @linseymarr Julian Tang, Waren Finley, et al🧵👇 1/12 tinyurl.com/mrv75rmbImage Can we predict how bad a new airborne virus will be before it spreads widely?
Our paper dives into how viral receptors and particle deposition models could help us prepare better for future pandemics. 2/12
Oct 9, 2023 • 6 tweets • 3 min read
ℹ️🦠😷⚙️💨🧑‍⚕️🦸ℹ️
New update of the @WHO IPC guidance !!

Main take: 'Airborne precautions' is repeated 31x in this update! 31x more than the previous version (v2023.2)!
could've arrived sooner - YES - but it is a sign and a very good sign!! 👏
+points 👇🧵who.int/publications/i… ⚙️💨 Ventilation!!!!
60 l/s/patient is equivalent of a C02 level at steady state of 520 ppm. 6x larger than the typical office rate of 10 l/s. 👍 /2 Image