Sorry, I’ve only just come back to this thread, but I can’t not make a small point about this post in particular as it demonstrates why I find it really hard to have a discussion about this and why I have a problem with a lot of legitimate discussion points being filed as conspiracy theory.
And I mean no disrespect to you Gaz, but it’s just so hard to get anywhere because of misunderstandings like yours in this particular case. (And yeah, I’m just as guilty of misunderstanding plenty of the data we are given too.)
Firstly, using an infection fatality rate of 0.4% and applying it to 532 cases simply does not work and is a massive simplification of things that renders any case estimate based on it as completely irrelevant.
This is because different IFR apply to different age groups.
For example, using an Imperial College study (which I’m using purely for illustrative purposes as it was one of the first I found when doing a google search) they estimate :
30-34 yr old IFR approx 0.06%
60-64 yr old IFR approx 0.89%-0.94%
85-89 yr old IFR approx 8.28%-8.86%
90 yr old + IFR approx 16.19%-17.37%
So if the majority of those 532 deaths are occurring in the older age groups, (which we know they massively are) then the IFR of that particular group of 532 will be way, waaaaaay higher than 0.4%.
You need to look at the proportion of each age group that makes up the 532 deaths, and work it out from there, applying the IFR based on that, to get anywhere near the cases.
You also need to look at the deaths figure for a set day, rather than the days reported (532 covers deaths across a range of dates, probably even covering a month or more)
I haven’t time to find the exact make up of the 532 deaths currently but a quick look at today’s hospital data, for example, shows that of 317 reported deaths (which covered actual dates of death ranging from 10th Oct-11th Nov) only 17 were under the age of 59, 131 were aged between 60-79 and 169 were 80+.
I’m guessing that sort of ratio is probably fairly representative of each day, or at least in similar range. So using an IFR of 0.4% is so far out it’s just unreal.
Let’s just, purely for illustrative purposes, say that all of the deaths occurred in 75-79 yr olds. Using the Imperial College study IFR of 3.39-3.61 - Even at the lower IFR that still equates to 15,693 cases...
See what I mean? It’s just not as simple as saying ‘let’s use an average IFR, even one on the higher side, and apply that to the number of reported deaths in the headline and work out the rough cases to see whether there are loads of false negatives/false positives’.
We all know that the overwhelming majority of deaths occur in the older age groups - this is not disputed. What’s the average age of death for covid at the minute?something like 82? (I’ve not checked)
We know that the IFR in the older age groups is also much much higher. This is not disputed.
So to use 0.4% as your IFR to illustrate that their are way more cases than ‘officially’ is just way, way out and way too simplistic.
Secondly, you said
‘ and if you take the figure 20% showing symptoms’.
This implies you are saying 80% are asymptomatic. Where does this come from? Even SAGE estimate asymptomatic cases to be in the region of something like 28%(so in your example, 20% symptomatic should actually be 72%) .Huge difference.
Anyway, that’s why I give up on this discussion and this isn’t a criticism of you GazC_MFC, and I hope you don’t take it that way and realise that is not what I’m trying to achieve by this post.
It’s just more generally there is a big misunderstanding and misinterpretation of the data we are fed, amongst us all, that it’s not possible to have a proper discussion about things by messages on a forum.
I can’t help feel that there is no desire to clarify the public misunderstanding of what the data is actually saying and I find that a little odd. For example, how many people out there are still thinking a daily report of 20 k new cases means that there are just 20k new cases that day, and that they all definitely had covid and were infectious at the moment. Or that 532 deaths reported means that 532 people died the day before? Or don’t understand the difference between CFR and IFR. It’s probably a much higher proportion than it needs to be.
IFR study-
https://www.imperial.ac.uk/media/imperial-college/medicine/mrc-gida/2020-10-29-COVID19-Report-34.pdf
Review of asymptomatic covid cases in the community -
https://assets.publishing.service.g...RS-CoV-2_infections_in_community_settings.pdf