Thanks @gummibear737 for explaining "regional mystery & pre-existing immunity" pattern.

Maybe it explains why Melbourne (Vic) has seen more cases compared to other parts of Australia.

Comparing Victoria to Western Australia:
Population approx. VIC 2.5x WA.

1/9 https://twitter.com/gummibear737/status/1298246365366169602
2/9
I think Western Australia haven't had big problems handling Covid yet but Influenza 2019 looks severe.

2020 Influenza (purple) almost not noticeable, hence I assume sentinel report (next graph 👇) includes Covid.
3/9
This graph is about "ILI-like" illnesses.
There are almost zero confirmed Influenza cases for Western Australia in 2020.
This graph includes most likely Covid as well as other viruses (rhino and so).
Compared to 2019 not a big drama.
4/9
Now Victoria.
Looks like flu season 2017 was more severe than 2019.

Also:
"The number of notified cases of laboratory confirmed influenza is 91% lower than the number notified by the same time in 2019."
5/9
End of August 80% of all confirmed Covid cases throghout the country were reported in Victoria.

This proportion matches well with according hospitalisations.
6/9
Looking at the overall Australian hospitalisation it's still well balanced compared to previous years.
Is it because of "regional mystery" in terms of
pre-existing immunity?

"Picture in Picture"
8/9
While Victoria has 80% of Australia's Covid Cases it's still worth to compare Covid cases vs. ILI cases previous years (in terms of seasonality?).

commulative Covid cases today: 25.923

"Picture in Picture" again
9/9
Sources
@federicolois & @maestro_rayo
What's your opinion👆
Thanks.
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