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Derrick VanGennep Profile picture
Derrick VanGennep
@VanGennepD
Quant/physicist. Formerly at @HarvardPhysics, @NationalMagLab, @UF
Jan 23, 2021 • 4 tweets • 2 min read
@BillHanage Portugal:

“We observed that the proportion of SGTF cases increased from ~1% in weeks 49-50 (2020) to 11.4% in week 2 (2021).”

virological.org/t/tracking-sar… @BillHanage Death rates look pretty bad too.
Jan 3, 2021 • 14 tweets • 7 min read
I recently bought one of these air quality monitors and got to take it out for some measurements!

I'll share some findings in this thread.

CCing @CO2Guerrillas here, in case they would like to share. A very quick intro:

This device measures:

-CO2 concentration
-relative humidity
-atmospheric pressure
-temperature

I spent ~$200 on Amazon. It pairs with your phone and you can watch data come in every minute or so.

aranet4.com
Dec 24, 2020 • 4 tweets • 1 min read
Best thing about 2020: Image For the cat people: Image
Nov 20, 2020 • 10 tweets • 3 min read
A quick note on the asymptomatic rate for Covid-19:

There is a bogus claim going around that basically says the vast majority of infections remain asymptomatic.

They usually cite this one random Chinese dataset with little-to-no information. This is used for a few main purposes:

1) To downplay the severity of COVID

"You'll be fine! Most people don't even show symptoms!"
Nov 19, 2020 • 5 tweets • 2 min read
Not to mention, during their second lockdown, daily cases were being cut in half about every 12 days.

Got double the daily cases? Add ~2 more weeks to their containment timeline.

(Speaking fairly roughly here, but you get the idea) Their first wave was crushed at an even faster rate than their second, eyeballing it from daily cases. Image
Nov 17, 2020 • 6 tweets • 3 min read
I understand and agree with many of these points, but I don't think the timeline of 3-5 months is realistic.

With a green zone strategy, many places don't have to do much at all before opening up and living like normal. That is, for them, the duration of lockdown is ~0. Isaac lean towards getting cases low and keeping R~1.

1) If you can get cases low, you can get them to zero
2) If you can keep R~1, a bit more work gets you to containment
3) This state is highly unstable, as we've seen from dozens of countries.

Aug 8, 2020 • 31 tweets • 11 min read
A thread on "long covid", which describes long-term symptoms of Covid-19.

My point here is that infections matter, not just deaths.

An in-depth interview with someone suffering long-covid symptoms.

This group of people are often called "long haulers", and they don't seem to be very rare.