1 of 6:

7 December Gauteng #Omicron update:

Cases might exceed the Delta peak. All other variables will be significantly lower.

South Africa only has light restrictions currently (a 4hr curfew from midnight). The vulnerable continue to take extra care.
2 of 6:

Total hospital beds could be less than half of Delta levels (4,500 vs 9,200).

The growth rate is a consistent 10-12% per day.

data source: NICD

nicd.ac.za/diseases-a-z-i…
3 of 6:

Looking at more severe outcomes the gap is even larger.

ICU beds are expected to grow at 10-12% per day during the exponential phase.

ICU beds might peak at less than 570, almost 3x lower compared to the Delta peak.
4 of 6:

Ventilated beds are now showing a consistent increase. The expected growth rate is 10-12% per day during the exponential phase.

The peak is likely to be below 140, more than 6 x lower compared to the Delta peak.
5 of 6:

Gauteng short term projections for #Omicron:

Cases (7d average) are starting to fall well below the projection. Cases might peak earlier than expected.
6 of 6:

Gauteng has only had 124 C-19 deaths in hospital from 20 November to 7 December.

In this same period, there were 3,486 PCR+ patients admitted to hospital.

From 20 November to 1 December, there were 1,246 PCR+ patients admitted to hospital.
Correction:

4 of 6 (slide corrected)

Ventilated beds are now showing a consistent increase. The expected growth rate is 10-12% per day during the exponential phase.

The peak is likely to be below 140, more than 6 x lower compared to the Delta peak.

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More from @pieterstreicher

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. Image
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… Image
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. Image
Read 6 tweets
8 Dec
1 of 6:

Gauteng #Omicron update - 8 December:

The load on hospitals is significantly lower compared to Delta, and with a peak imminent, hospitals will not be overloaded at all.

No restrictions are needed to help hospitals in any way.
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 12-22 days, this variable is not a concern anymore.

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

The portion of hospital patients ending up in ICU is much lower (10%) compared to Delta (24%).

Considering that a significant portion of patients in hospital have not been infected before, or are not vaccinated, #Omicron must be significantly less virulent.
Read 6 tweets
8 Dec
1 of 4:

8 December Gauteng #Omicron short term projections:

Cases, hospitalisations and ICU beds are all running below my projections.

Ventilated beds are slightly above.
2 of 4:

The method is simple.

1. Determine the daily growth rate during the exponential phase for all variables.
(cases 30%, hosp 12%)

2. Estimate when cases will peak based on an Rt extrapolation. Alternatively, fit a Gompertz curve to the case trajectory.
(12 Dec)
3 of 4.

3. Apply a consistent drop in growth rate from the point when growth is not exponential anymore to the point when Rt=1.0. (Alt. - Gompertz fit)

4. Add a suitable lag period for the hospital variables. I used 6 days for hospital and another 5 days for ICU/vent beds.
Read 5 tweets
6 Dec
1 of 6:

6 December Gauteng #Omicron update:

With only light restrictions in South Africa, the load on hospitals remain much lighter compared to Delta.

My expected peak range from 12-22 December might be too conservative.
2 of 6:

In the next 3 days, we should be able to a more accurate prediction for the peak.

Total hospital beds could be less than half of Delta levels (4,500 vs 9,200).
3 of 6:

Looking at more severe outcomes the gap is even larger.

ICU beds might peak at less than 570, almost 3x lower compared to the Delta peak.
Read 6 tweets
6 Dec
1 of 4:

#Omicron - Gauteng will peak around 16 December.

Follow this report on Rt by Louis Rossouw to guage when Tshwane and Gauteng are likely to peak.

unsupervised.online/static/covid-1…
2 of 4:

Extrapolating Rt for Tshwane gives a peak on 9 December (Rt = 1.0 on ~ 9 December).

The other regions in Gauteng should peak approximately 7 days later around 16 December.

Hospital variables should peak another 4-14 days later: 10-20 December.
3 of 4:

Total hospital and ICU beds will grow at 10-12% per day maximum.

The growth rate in hospital admissions lag cases by approximately 5 days (horisontal offset between dark brown and blue lines).
Read 4 tweets
5 Dec
1 of 5:

5 December Gauteng #Omicron update:

#Omicron will not overload hospitals, even with light restrictions.

Even if daily cases peak at levels 3x higher than Delta, ventilated beds will be 6x lower.

data source: NICD
nicd.ac.za/diseases-a-z-i…
2 of 5:

Although daily hospital admissions are only slightly lower than Delta, the average hospital stay is much shorter at 2.8 days, down from 8.5 days for Delta (MRC). The result is much lower total admissions.

A peak between 20-30 December will be well below Delta levels.
3 of 5:

As we look at more severe outcomes, the gap widens even further.

Omicron patients in ICU is running at levels 6x lower than Delta.

A peak between 20 - 30 December will be 3 - 5 x lower than Delta.
Read 5 tweets

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