1 of 7:

Gauteng #Omicron update - 12 December.

The 7 day avg cases increased above the previous highest level of 9,645 on 9 December to 10,131 today.

This is most likely the result of a reporting delay (16,716 today).

The peak is now likely to end up in the window specified.
2 of 7:

I work with cases by reported date. In this table by Louis Rossouw, cases are given by specimen date, but we will have to wait a day or two to see how the 16k cases from today are allocated.

Either way, growth if any is extremely slow currently.

unsupervised.online/static/covid-1…
3 of 7:

The increases in hospital variables were negligible today, but this is most likely the typical weekend effect.

data source: NICD
nicd.ac.za/diseases-a-z-i…
4 of 7:

The most contentious issue regarding my tweets remain my assertion that #Omicron is extremely mild compared to Delta.

My most compelling argument is that Delta is still running at a CFR of 3% in South Africa, while Omicron is running at ~0.42% at the same time.
5 of 7:

The unexpected early dropoff in cases below my projections might be the result of reporting delays.

All other variables are tracking my projections reasonably well.
6 of 7:

A major fear in Europe seems to be the expectation that #Omicron will infect up to 70% of the population.

#Omicron will infect only 15-25% in South Africa, and we only have light restrictions (a curfew from 12-4am).

Restriction details:
gov.za/covid-19/about…
7 of 7:

All variants and all waves in almost all countries reach saturation at well below 30% infected, even in countries with only light restrictions.

It is unlikely that #Omicron will be different.
Here is an update showing 7 day average cases by specimen date.

More than 50% of cases reported yesterday were sampled several days earlier.

The daily increase is marginal now.

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More from @pieterstreicher

14 Dec
1 of 6:

#Omicron update:

Gauteng, South Africa is peaking with case levels similar to Delta, but with deaths expected to be 25 times lower. Image
2 of 6:

As disease severity increases, so does the gap with Delta increase.

Peak ventilated bed levels will most likely end 6x below Delta levels.

data sources:
NICD hospital reports
@lrossouw (cases by specimen date) Image
3 of 6:

The CFR of Delta was 3% up to late November and is probably still 3%.

The increase in deaths since early December, most likely from #Omicron is following the 0.5% CFR projection (orange) more closely. Image
Read 6 tweets
13 Dec
1 of 6:

#Omicron - Could this be the end of the pandemic?

For South Africa it might be.

Gauteng, South Africa is peaking with case levels similar to Delta, but with deaths expected to be 25 times lower.

(The 7 day average cases by specimen date were added - light blue.)
2 of 6:

Hospital beds could end up well below the 4,500 projected on 4 December already.

The Delta peak was 9,200.

data source: NICD
nicd.ac.za/diseases-a-z-i…
3 of 6:

ICU beds could end up well below the 570 projected on 4 December already.

The Delta peak was 1,433.

South Africa currently only has light restrictions:
businesstech.co.za/news/governmen…
Read 6 tweets
11 Dec
1 of 6:

#Omicron - Is this the end of the pandemic?

No restrictions will be needed to protect hospitals in any way in any country.

Gauteng, South Africa has peaked with case levels similar to Delta, but with deaths expected to be 25 times lower.
2 of 6:

Mild, milder, extremely mild.

As disease severity increases, the gap with Delta widens.

Keep in mind that SA is extremely vulnerable to C-19 with an average IFR of 0.5%, and 230,000 excess deaths attributable to the virus.

The IFR of #Omicron is estimated at 0.053%.
3 of 6:

Gauteng cases have peaked already, and there is only a slight uptick in C-19 deaths. Total confirmed C-19 deaths from #Omicron is estimated at 640 for this wave.

Gauteng had 15,400 confirmed C-19 deaths from Delta.

data source: NICD
nicd.ac.za/diseases-a-z-i…
Read 6 tweets
11 Dec
1 of 6:

10 December Gauteng #Omicron update:

There is a drop in the 7 day average case levels. This is 3 days before the peak range expected.

Gauteng is experiencing a mild wave with significantly lower deaths compared to Delta.
2 of 6:

The peak in hospital beds will lag case levels.

With an earlier peak in cases, an earlier peak in hospital numbers can also be expected.

It is now clear that hospital beds will not get close to Delta levels.

(data source: NICD)
3 of 6:

As we look at more severe outcomes, the difference is even larger.

Keep in mind that SA only has light restrictions.

Clearly no restrictions are needed to protect the hospitals in any way.

(data source: NICD)
Read 6 tweets
10 Dec
1 of 10:

Should the rest of the world fear #Omicron?

South Africa is experiencing a very mild wave with #Omicron. The hospitals are easily coping even though case levels in Gauteng will exceed Delta levels. South Africa currently only has light restrictions.
2 of 10:

Despite light restrictions it is expected that only 15-25% of the country will be infected with #Omicron.

The South African context is unique. 70% of the population have had Covid-19 already. Only 50% of the adult population is fully vaccinated.
3 of 10:

Scenario 1: #Omicron escapes vaccine and natural immunity to a significant extent.

In this scenario, everyone in South Africa would have been vulnerable to Omicron, so the low deaths could then only be ascribed to a significantly lower virulence of the Omicron itself.
Read 10 tweets
9 Dec
1 of 6:

Gauteng #Omicron update:

Cases in Gauteng are likely to peak between 12 and 20 December.

The growthrate in 7 day average cases is slowing down consistently. It was 5% per day in the last day, down from 28% per day 12 days ago.
2 of 6:

The total number of patients in hospital is well below the Delta wave.

Since a peak in hospital numbers is expected in 11-21 days, this variable is not a concern anymore.

data source: NICD
nicd.ac.za/diseases-a-z-i…
3 of 6:

As we look at more severe outcomes, the numbers are even lower. ICU beds track well below the Delta trajectory.

No restrictions are needed to help hospitals in any way.
Read 6 tweets

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