Day 26 Scoreboard for Tuesday 7th April (8:40pm data):
5,919 total Australian confirmed cases.
124 new
+2% single day increase.
TODAY WE LOWERED THE CURVE (-1%)
+2% daily increase (rolling 3 day average).
Today we earned our third Suppression Flag by maintaining the 3 day average growth rate at or below 3%. Given that we have also maintained our confirmed case growth at or below 3% for 3 out of 4 consecutive days, this signals that we have entered…
Phase 3: Suppression
Over our 15 day long Mitigation Phase (which started on the 24th of March) we averaged a -1.5% daily rate of reduction of cases. We have reduced our daily case growth (3 day average) from +24% to +2% today.
8 new deaths in the past 24 hours means that the
AU death toll has now risen to 48.
Please note, text and numbers updated today are highlighted in BOLD
Hi everyone, my name is** Scott **and I will be presenting today’s update of confirmed COVID-19 cases (and projections) for Australia
on behalf of our hard working Melbourne-based collective!
On Monday we switched away from the simple Exponential Growth (EG) model and moved to a new one, which we have called Mitigation+Suppression (M+S). We also changed from plotting the Y axis linearly, to exponentially (using base 10). Growth rates are calculated based on the average of the most recent 3 days of confirmed new infections (each day and average rounded to the whole %). Projected new cases are rounded up to the next whole number.
This new model presents (and utilises) our full history of total case numbers, detects what phase we are currently in, then makes projections into the future based on a small number of conditions and rates that we can adjust for each phase. Our aim is not to try and nail a prediction of the future, we simply want to illustrate how varying these rates and conditions can influence our future case load.
The new model also estimates “active cases” based on the sum of our new cases in the last 10 days (directly, no “distribution about a mean” of these cases in time). We also plot a selected percentage of active cases; presently we have chosen to display 5% of active cases. This is a conservative estimate of the proportion that might require ICU treatment. Estimates on this vary and the local data is still emerging, so interpret these numbers with care. We have refrained from providing a line representing our available ICU resources, as this is also changing with new bed and ventilator resources being brought online. For reference, in previous models and updates we have used a number of 2,000 beds (available for COVID-19) as an estimate.
According to the parameters of our model we are currently in: Phase 3: Suppression
In this phase, our model estimates our potential future case growth at 1%, 2% and 3% per day, with these growth rates remaining steady into the future. These rates will be indicated as Scenarios S1, S2 and S3 respectively.
Maintenance of the Suppression phase cannot be assumed. A return to Phase 1: Exponential Growth phase would be signalled by three out of four days with an increase in the 3 day average growth of 1% or more (i.e. the reverse of our Mitigation flags).
Additionally if we returned to a growth phase, three Mitigation Flags would then consequently signal a return Mitigation, while any 3 out of 4 days below 3% would signal a direct return to Suppression Phase.
NOTE: We have decided to add graphs of locally transmitted cases for NSW and Victoria to these daily updates.
The case numbers of today for NSW, and yesterday for Vic have not yet been updated, hence we have no new updated graphs to offer at this time.
Please see the recently updated features at our recommended website if you would like to review the breakdown of transmission sources in more detail for these and other selected states:
https://www.covid19data.com.au/
NEW: This website also launched a new tab of data this week which deals with Testing, with detailed trends on local and international testing rates.
As of 10pm yesterday Australia has:
• Conducted 302,759 tests in total (+5,000 last half day)
• Tested 1,189 people per 100,000 of population (1.19%)
• Returned 1.92% positive tests
While we’ve made some very encouraging progress this week, we want to caution everyone against overconfidence or misrepresenting these results. A sharp increase in community transmission, increased testing rates or a broadening of the criteria for testing eligibility,** could all result in a break-out from the current Suppression trend, and a return to an Exponential Growth or Mitigation phase.**
We will continue to provide three separate modelling Suppression Scenarios for your consideration. These should NOT be interpreted as predictions. Nor should they be considered to directly correlate with specific levels of response, they are merely sample outputs.
This data should not be interpreted as an excuse to “take our foot off the pedal”. We currently have the opportunity to continue suppressing this disease locally (tightly limiting its growth and spread), we should make the very most of it. Every fraction of a percent we are able to reduce the steady-state daily growth rate by, helps us to potentially shorten the crisis and reduce its impact on our society and people.
Scenario S1: Strong Suppression - 1% daily case growth
This scenario is currently a reasonable fit for countries with high rates of testing and effective contact tracing that are holding case growth to very low levels (i.e. South Korea). This level is probably our best case scenario.
Scenario S2: Weak Suppression - 2% daily case growth
This scenario presents a less effective suppression phase, with cases continuing to grow steadily at 2%.
Scenario S3: Very Weak Suppression - 3% daily case growth
This scenario presents a much less effective suppression phase, with cases continuing to grow steadily at 3%. At this rate of growth we would exceed our recent current peak case numbers in less than 5 weeks, and keep climbing.
Remember, our actions today will only show up in this data in 1 week’s time (at best). The next 7-10 days of confirmed infections are likely already beyond our control.
Please double check for any errors/oversights and comment below.
Consume critically. SHARE WIDELY. Act appropriately.
Join this group for daily updates (usually between ~5 and 9pm once data for all states is confirmed)
Data Sources:
Preferred:
https://www.covid19data.com.au/
Alternate:
https://www.health.gov.au/news/health-a ... se-numbers
and (occasionally):
https://www.youtube.com/watch?v=qgylp3Td1Bw
Essential Reading List:
(Our particular favourites and most trusted, not intended to be a balanced selection of viewpoints)
Australian Numbers / Voices:
Megan Higgie and Andrew Kahn:
https://medium.com/@megan.higgie/withou ... f83b52756e
John Daly:
https://mobile.abc.net.au/news/2020-03- ... oC5v9PaAyc
AUS Government / Doherty COVID19 Modelling White Papers:
https://www.doherty.edu.au/uploads/cont ... pendix.pdf
https://www.doherty.edu.au/uploads/cont ... 9_Apr7.pdf
Global Numbers / Strategies / Warnings Reading List:
Tomas Puyeo (for Medium)
https://medium.com/@tomaspueyo/coronavi ... d3d9cd99ca
https://medium.com/@tomaspueyo/coronavi ... 9337092b56
https://medium.com/@tomaspueyo/coronavi ... b886af37e9
NZ Government COVID19 Modelling White Papers:
https://www.health.govt.nz/publication/ ... ng-reports
MIT:
https://www.technologyreview.com/s/6153 ... 18-months/
Imperial College UK:
https://www.imperial.ac.uk/media/imperi ... 3-2020.pdf
Tableau:
https://www.tableau.com/about/blog/2020 ... HSylLH9dkg
DISCLAIMERS:
These are completely unofficial predictions made based on current and historical data by people who are definitely not epidemiologists. Interpret at your own risk, we make no claims or guarantees. Please consider a broad range of information sources and opinions on this topic.
This report is a product of a collective, and incorporates advice, feedback and modelling from a broad range of contributors. Like everyone, we are capable of mistakes and omissions, for that we apologise in advance. You can trust us to publicly own any mistakes we do make.