Alberta:
Announced* new B117 cases seem to be doubling every 2 weeks.

At this rate AB could have:
1000+ daily cases around May 10,
2000+ daily cases in late May

*Please read footnotes under the graph.
1/
It is not doubling as fast as it could, e.g. not every 7 days.

But doubling every 2 weeks is still *very fast*.

It's *faster* than Alberta's November surge, when cases were doubling every 2.5 weeks.

2/
In theory vaccine could flatten such growth, if 40% of Albertans would get vaccinated and if the vaccine would be 60% effective against transmission.

As of today, 5.5% of ppl in AB received at least one dose.

Meanwhile, reopenings will likely increase the rate of spread.

3/
The growth of B117 can be stopped and 3rd wave can be prevented if AB adopts #COVIDzero policy.

The graph below is from few weeks ago.
We are still just 6 weeks away from relative normalcy.

By not aiming for #ZeroCovid we are wasting again the sacrifices made during shut-downs.

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More from @GosiaGasperoPhD

13 Mar
A great simulation comparing the spread of variants over ~6 weeks, starting from 100 cases.
Wild Type R = 0.7
Assuming B117: 50% more transmissible, P1: 70% more transmissible than the Wild Type.
R=0.7 is what AB had at the end of the shut-down last spring. Wild Type daily case count was halving every 8 days.
Under that conditions P1 would still spread like a wildfire.
Please play/run the simulation few times.
Stochasticity (randomness): Each time the result is different, but Wild Type always goes down, while P1 in vast majority of runs shoots up super fast.

Read 9 tweets
12 Mar
“Public Health Director Horacio Arruda has said that vaccination will make COVID-19 less severe and that we could tolerate up to four to six times more cases if they were less severe. Yet if there is more community transmission, there will be more variants, more long-term COVID..
“...and the possibility of more long-term effects among the younger population.
...
Read 9 tweets
1 Mar
Scenarios for Alberta COVID spread.

Current policy seems to be producing a third "wave".

As always, #COVIDzero is the way out - the only rational and humane solution.
Had we adopted #COVIDzero strategy on Nov 11, we would have now *6.5 weeks of no community transmission*.
46 🍩days!
Which means businesses could be relatively safely reopened.
And we would have a perspective of a normal spring and summer.
...
Maybe we would need to stamp out small flare ups, but the vast majority of people who got sick or died from COVID between Jan 15 and today, would be healthy and alive.
And people who need to live in isolation since 1 year, could now have normal life. Since couple of weeks.
...
Read 4 tweets
12 Feb
B117 grows exponentially in AB, doubling every 7 days.
At this rate it'll become dominant on Mar05
and AB will have:

Mar 15, 500 daily new cases
Mar 24, 1000 daily new cases
Mar 31, 2000 daily new cases

Yes, the government and AH can avoid it. By aiming for #COVIDzero ASAP
To put such growth in context:

AB fall surge: doubling time = 2.5 weeks
March, beginning of the pandemic: doubling time = 7 days
Today's B117, *despite of restrictions in place*: doubling time = 7 days
What does this fast growth mean?

1) AB travel control is weak -> B117 gets seeded in the community.
2) Testing (although impressively ramped up) and Tracing is *not* halting B117's exp. growth.

Alberta *doesn't have B117 under control*.
Read 5 tweets
9 Jan
1) The B117 variant is a killer. We cannot afford to have it in AB

If we have 1000 cases/day now, with an R=0.86 we could reduce it to 600/day in 2 weeks

➡️But w/ added transmissibility of B117 variant that has ~60% higher R, in 2 weeks, we’d have *3000* new cases/day instead
2) If B.1.1.7 is ~60% more transmissible, moderate shut-downs might not be sufficient for R<1.

Only strict 1st wave style Austria or NZ measures would be able to control B.1.1.7 spread.
3) The window of opportunity to get ahead of B117 is very narrow.

In South West London in just 2 weeks the amount of B117 grew from something quenchable, into an epidemic that is hard to controll even with very strict measures.
Read 10 tweets
30 Dec 20
Tweet from Summer, but very relevant now.

Over next days AB can choose to:

A) aim for elimination & stop community transmission within few weeks, or

B) keep struggling (bonus: new variant = more struggle)

1/

With strict measures AB can stop community transmission by late February.
Then protect zero community transmission status w/ travel control and cases monitoring.


2/
To eliminate COVID in AB:
Keep stringent measures in place (get to and keep R=0.6) till we get to zero daily new cases.
Don't reopen in-person classes before we get to zero (that is till ~late February)

3 a/
Read 13 tweets

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