I live in a country that has mandated masks even in outdoors (where I don't use it, period). I vote with my wallet, BUT, for maximum civil disobedience this is my mask for when I have no choice (shops, kids school, etc). It reads: "Doesn't filter aerosols. Doesn't work for CV19" Image
For maximum irony, this is a triple layer, high quality, medical grade mask (even though ear loop design is quite crappy IMHO), next step: N95 (but they are a pain to wear). So when anyone says something I tell: "Come on? Haven't you read the evidence?" and then I explain.
Then I point them to the hilarious European CDC study and explain the how 19 out of 20 are just bad evidence and the only one that its actually good, is compatible with higher infection rates. Details here:
And people actually engage when they find someone that actually know something. So then I ask them, how if we did everything right Argentina (my country) is in the TOP 10 of deaths per million of people at risk. Something may not be working.
So, If I have to use a masks at least I will do it in a way to at least forces people to ask themselves questions. I gave you the idea, I am pretty sure you can find a message you can own. Tag me on yours. And RT, if more people do it, probably it will start something.

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More from @federicolois

1 Mar
1/ Because by judging from other countries (mine for example) that is completely true. Just took my kid to primary school, all parents packed together (with their 'masks on' of course). Who would have known? Right?
2/ But let's make it fun. Every thread is better with a poll. Do people use masks properly in your city? Keep distance, don't touch it, over the nose... you know the usual.
3/ That's why I wrote this small rant a few weeks ago. Because using PPE in the wrong way is worse than not use it at all.
Read 15 tweets
23 Feb
1/ There is absolutely no discussion that if you have a disease that doubles its size every 3-4 days and 2% of those infected requires hospitalization you are going to have a quite difficult situation to deal with. Not even a newbie modeler would disagree with @neil_ferguson
2/ But as @gidmk told me once in one of our initial exchanges (and respectful disagreements): "Everyone comes into epidemiology for the uncertainty and stay for the nuance" (if I recall it correctly, corrections please). The entire response rest on those nuances, let's dissect.
3/ At least in my mind there is no doubt that the Ro of SARS-Cov-2 is very high (we estimated 3.3) and if we account for the UK variant we are probably 30% up from there. So, we can say we agree probably up to the decimals level.
Read 14 tweets
23 Feb
1/ When we wrote this paragraph back in October I wouldn't know how close to home it would hit. Back in October my mother-in-law (65+) fainted in the bathroom while having diarrhea. It was quite a scare as she got hit very hard.

Ref: medrxiv.org/content/10.110…
2/ Not long after my father-in-law (80+) was diagnosed with anorexia nervousa. Doctors presume that loneliness caused by the lockdown, plus the scare of the episode would have been more than enough to cause it.
3/ Back then I immediately told my wife that those were signs of COVID, being health personnel and working on the lab at the hospital knew very well the evidence. On her account, the evidence was definitely not anywhere near what they thought were signs of the disease.
Read 9 tweets
20 Feb
Let's play a game. I will ask a few things about SARS-Cov-2 and you respond in a poll. Let's see how many points do you get.

#1: Is there a non-human reservoir or vectors (or both)?
#2: Is the disease geographically restricted?
#3: Is there a 'sterilizing' vaccine or any other transmission-disrupting alternative?
Read 14 tweets
17 Feb
1/ By popular demand I was going to do a deep dive into the European CDC Face Mask recommendation study. Well, it may end but be a bit shallow. There is not much depth to be diving into. ecdc.europa.eu/en/publication…
2/ The study follows a usual form with clear inclusion and exclusion criteria (which is good). It uses the GRADE framework to ascertain the evidence and generate a recommendation. That is among the best we got in the evidence based land.
3/ The number of studies included is 'interesting'. With a n=118 we would expect to get a nice body of clear cut evidence to support the recommendation. Image
Read 17 tweets
11 Feb
1/ What does this mean for research? For example, while my twitter followed has increased absurdly since early last year because of my work on data analysis on SARS-Cov-2, I was mostly known for my work in performance analysis.
2/ What performance analysis teaches you is that you run experiments of the type 'If P then Q' every single day, several times a day.
For ex. "If I change this data structure then I will be able to obtain better performance by accessing memory contiguously"
3/ Now, when you enter into the realm of 'how the physical CPU is working' then becomes far more difficult. The reason behind that is that with that many moving parts noise is very difficult to separate from the signal.
Read 8 tweets

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