We're seeing a decline in severe outcomes in multiple provinces, with decline in waste water and estimated total infections in many.
It looks like we're coming out of the holiday wave/surge--the duration looks fairly similar to the surge we saw around Thanksgiving.
But....as you can see from this image here, estimated actual infections are continuing to increase for multiple provinces (CAN, BC, NL, NS, ON, North)--not fast (except for North), but steadily.
If/when we see hospitalizations pick up we'll likely be in the XBB.1.5 surge/wave.
With Ontario XBB.1.5 currently (actually last week) at ~30% of sequenced samples, I'd guess we'll see Ontario severe outcomes start to take off in the coming week.
We also only have waste water data for many regions up to about Jan 14 (older than that for quite a few). We'll be watching the next week or two of data closely.
Something I think it's really important for people to consider wrt the XBB.1.5 in eastern U.S. states is that surges in hospitalizations are likely not just due to surges in infections, but also the low uptake of boosters even among those at higher risk of severe outcomes.
Protection against severe outcomes does slowly decline over time. If you haven't had a new shot in the last 6 months, you really, really, really need to update your vaccines. This is STRONGLY recommended in the most recent NACI guidance.
No, they're not up on our website yet. We're slow.
FYI--there are a few provinces where we'd be dropping recommendations down a notch so that people who are not higher risk are no longer advised to avoid non-essential indoor settings.
But, given that we're likely transitioning into an XBB.1.5 wave, and that most Canadian data is at least 1 week behind, we're keeping recommendations at the level specific to VERY HIGH and SEVERE index levels.
Canadian COVID Forecast Jan 22-28, 2023
CANADA
SEVERE
About 1 in every 32 people is infected.
HOW TO HELP:
Mask, get your booster, avoid non-essential indoor public places, social gatherings.
Higher risk: also avoid outdoor social gatherings.
FYI--for those wondering why QC hasn't hit same maxima as rest of country since start of fall...
Two possible explanations:
1) QC has significantly higher fresh dose uptake among people 40+ than most provinces (except BC)
2) QC had a large summer wave w/ substantial mortality.
Higher fresh vax dose uptake among those at risk of severe outcomes plus lots of infections in last 6 months may be blunting/shortening waves in QC--at least for now.
Canadian COVID Forecast Jan 22-28, 2023
ONTARIO
SEVERE
About 1 in every 31 people is infected.
HOW TO HELP:
Mask, get your booster, avoid non-essential indoor public places, social gatherings.
Higher risk: also avoid outdoor social gatherings.
One persistent trend we've noticed since the summer is that provinces that had lower seroprevalence by end of summer are experiencing bigger/longer surges than provinces where more the population has been infected at least once.
It's not a huge difference, and by now almost all provinces have/are close to having about the same % of population infected at least once. But for those that are slightly lower, surges seem to be more intense and longer.
This makes sense--there's less tinder to light the fire.
What is not clear is how long that blunting effect will last. It's always good to follow QC data, since it's generally reported fast and accurately (although even QC has started modifying reporting of hospitalizations).
And it's always possible the apparent blunting effect reflects changes in reporting, although I'm more inclined to think this is blunting.
Certainly it's no surprise that Atlantic provinces, ON and BC have been having the worst time through the fall until now, since seroprevalence in these provinces is lower than QC AND they have lower rates of booster uptake than QC (except BC).
Anyway....back to the thread :)
Canadian COVID Forecast Jan 22-28, 2023
MANITOBA
HIGH
About 1 in every 77 people is infected.
HOW TO HELP:
Mask, get your booster, avoid non-essential indoor public places, social gatherings.
Higher risk: also avoid outdoor social gatherings.
I'm going to take a break, but will be back soon to do a series of polls to find out how well people following this thread understand who is at higher risk of severe outcomes from COVID, according to information posted on the official pages of PHAC and provinces.
Feel free to start listing the categories you know are associated with higher risk in the replies until I get back.
And yes, you can cheat by going to PHAC and provincial public health pages to look this up.
Ready, set, GO!
Let the polling begin!
Test your knowledge of who is at higher risk of severe COVID outcomes and should take extra precautions to avoid infection, according to @GovCanHealth.
Are you at higher risk of more severe COVID outcomes
Before I share province info, it's important to know that estimated infection numbers are similar to recent numbers for the UK, even without much XBB.1.5.
Here's a screenshot from @ONS showing infection numbers from randomly sampled testing.
About 1 in 20 people infected.
@ONS There have been big changes in the most recent week, partly because December holiday data finally came in and we started getting waste water data for the end of December/early January.
@COVID_19_Canada If you have questions about the data and/or about COVID in Canada, we have several free, bilingual evening Zoom sessions every week where people can join to talk with me, other researchers and people across the country.
It is now clear that we're seeing the beginning of a new wave.
BUT...the data we have from last week to do this forecast is still quite incomplete due to delayed reporting.
We're releasing this now instead of waiting until next week when data are more complete so people know a new wave has started and that they need to start/resume/continue taking precautions.
The scores have become more volatile in the last week. We usually see this at start of new waves, when some provinces are still seeing some numbers coming down quite low compared to earlier periods, but there are starting to be spikes in other variables, especially waste water.
We're not sure if there will be a new wave, or if it will happen in all provinces. Some, like PEI and NS, were in a very prolonged very high period recently, so numerous reinfections may be less likely there. Maybe.
The Dec 21 Canadian COVID forecast and data are now live.
I'll do a full thread tomorrow when the team has our graphics ready to go.
But I wanted to get the overview out because some provinces are increasing, including QC, which usually warns rest of country.
I've had time to update more of the model and input data, so it might be worth checking out for the data folk.
We've also started hand-tallying the severe outcomes by age and date in the PHAC weekly epi report. It's not downloadable, so it's a lot of work.
When we're done, we'll post the numbers on a publicly accessible page so no one else has to do the hand tallying to use the data in their analyses. We'll try to update weekly or biweekly--it's REALLY time consuming to do. I'm not great at scraping data from web pages. Sigh.