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*.
For clarification: the data on which I based this calculation is not perfect. It's based on dates when cases were *announced*.
I hope that AH will publish more granular data next week (w/ specific date information), so that making more accurate calculations will be possible.
It would be also great to be able to separate community cases from travel related cases, and see how those two trajectories differ.
• • •
Missing some Tweet in this thread? You can try to
force a refresh
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.
With strict measures AB can stop community transmission by late February.
Then protect zero community transmission status w/ travel control and cases monitoring.
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)
Sustained R, starting from 1,600 daily new cases (dnc):
R=0.97 ➡️ halving time (ht)=3 months ➡️ 1,020 dnc in 2 months
R=0.8 ➡️ ht=12.4 days ➡️ 60 dnc in 2 months, zero in 4.5 months
R=0.6 ➡️ ht=5.4 days ➡️ ZERO dnc in *2 months*
Toll of subsequent months (after the first 2 months):
R=0.97 : a lot of cases & deaths, high risk of exponential surge & next lockdown
R=0.8 : some cases and deaths, high risk of exponential surge & next lockdown
R=0.6 : NOTHING
3/
YYC NE has an extremely high new case rate (100/100 K, growing exponentially). It has a super fast doubling time of new daily cases: 1.5 weeks (AB 2.5 weeks).
Everywhere in the world, frontline & essential workers are the primary victims of insufficient pandemic responses.
1/
Calgary NE:
Daily new cases grow exponentially
Doubling time is: 1.5 weeks
At this rate, in NE, there will be:
Dec 15, 520 daily new cases
Dec 26, 1025 daily new cases
Jan 01, 1480 daily new cases
We need a sharp U-turn *now*
2/
Every day of *not implementing* supported lockdown in AB costs lives 👇