1) Ontario’s associate chief medical officer warned Monday the province is recording “quite a significant increase” in the number of #COVID19 cases screening positive for the more contagious variants of concern. In this thread, I will examine what this might mean for Quebec.
2) But first, let me turn to Quebec’s latest figures on #COVID19 variant cases. The province reported on Monday a cumulative total of 255 confirmed variant cases, up by 61, and 1,732 presumptive cases, up by 32 from Sunday. Please see the chart below.
3) What’s noteworthy beyond the general increase is that the Capitale-Nationale region confirmed two B.1.1.7 cases for the first time, as did the Montérégie. Also for the first time, Lanudière confirmed a B.1.351 case.
4) Montreal represents by far the B.1.1.7 hot spot in Quebec, but variants have cropped up as well in a total of eight regions across the province. This suggests that the variants are spreading between the regions at a fairly fast clip.
5) But the situation is far more worrisome in neighboring Ontario. Even though Ontario’s population is 72% higher than Quebec’s, it has to date posted a cumulative total of 935 confirmed #COVID19 variant cases, or 266.6% greater than Quebec’s tally.
6) As for presumptive cases involving variants, Ontario has recorded 4,645 thus far, or 168% greater than Quebec’s total. There may be several reasons Ontario’s variant figures are so much higher than Quebec’s. Ontario is likely screening more #COVID19 samples than Quebec.
7) Regardless of the reasons Ontario’s figures are higher, the province may be on the cusp of an uptick in #COVID19 cases after a precipitous drop in the last few weeks. Please see the chart below. Could the same thing start happening in Quebec?
8) Quebec authorities are projecting an increase in the number of variant cases, especially since students returned to schools on Monday. In the past 11 days, a total of 45 schools have declared suspected or presumptive #COVID19 variant cases in Quebec. See the chart below.
9) But rather than dwell on the growing threat of the variants, Quebec authorities would prefer to accentuate the positives of the vaccine rollout. Quebec is expecting 113,000 doses of a third #COVID19 vaccine this week by AstraZeneca.
10) At the risk of creating a false sense of security, it appears Quebec would prefer to put the focus on dropping #COVID19 cases and hospitalizations, all of which is evidently good news. But Quebec lags behind Ontario in releasing comprehensive stats on variants. End of thread.

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More from @Aaron_Derfel

10 Mar
1) Montreal authorities are alarmed by a sharp rise in cases of the B.1.1.7 variant in densely populated neighborhoods, where the positivity rate in the screening of COVID-19 samples has soared to as high as 25 per cent. Click on the link below. montrealgazette.com/news/local-new…
2) The chart below appears to show that Montreal has flattened the second wave in the #pandemic, thanks to public health restrictions and a #COVID19 vaccination blitz. This, of course, is truly welcome news, but the chart belies the lurking variants.
3) As I reported in my column in the @mtlgazette tonight, the variants are no longer proliferating in schools but in densely populated neighborhoods, too. Although authorities are quick to close schools with variant cases, what’s their plan for Montreal’s neighborhoods?
Read 9 tweets
8 Mar
1) As Quebec ramps up #COVID19 vaccinations and is likely to surpass its goal of inoculating 650,000 people by the end of March, it’s now facing what is known as the “Peltzman Effect” — lowering one’s guard in a risky situation. Ironically, this is mostly due to the vaccines.
2) University of Chicago economist Sam Peltzman first described this phenomenon in 1975 in which people adopt riskier behavior in response to visible safety measures like widespread vaccination. Credit goes to physician-scientist @EricTopol for tweeting about this recently.
3) Evidence is emerging of the Peltzman Effect in Quebec. On Saturday night, provincial and municipal police broke up an illegal gathering in a ski resort near Quebec City, fining 36 partygoers a total of $54,800. montrealgazette.com/news/quebec/il…
Read 10 tweets
7 Mar
1) During the second wave, Quebec has rejected air purifiers in classrooms, claiming these devices could be dangerous in the #pandemic. In this thread, I will show how those Montreal schools that did install air cleaners have reported fewer outbreaks involving the variants.
2) For this analysis, I’m indebted to the meticulous statistics compiled by Olivier Drouin of covidecolesquebec.org, who is a finalist for an international prize to be presented by DataHeroAwards.org. (Go vote for Olivier by clicking on this link: dataheroawards.org/tag/finalist-t… )
3) To date, a total of nine Montreal public schools have declared #COVID19 outbreaks involving suspected or presumptive variants, most likely the B.1.1.7 strain. Of the nine, seven schools do not have air purifiers, making them more vulnerable to #COVID19 contagion.
Read 12 tweets
5 Mar
1) Quebec on Friday reported that #COVID19 variants of concern are not only increasing rapidly but spreading geographically into new regions of the province. In this thread, I will examine the implications of this with the imminent reopening of schools.
2) In a chart below released Friday by Quebec’s public health institute, the Laurentians have gone from reporting zero confirmed cases of the super contagious B.1.1.7 variant to 10. Also worrisome is the sudden appearance of a B.1.351 variant case in this region.
3) B.1.351, which originated in South Africa and for which vaccines are less effective, first made its appearance in Quebec in Abitibi-Témiscamingue. There are now 40 confirmed cases in that region. B.1.351 popping up in the Laurentians suggests inter-regional transmission.
Read 11 tweets
4 Mar
1) Despite the welcome ramp-up in #COVID19 vaccinations, several disturbing facts emerged on Thursday in Montreal and across Quebec suggesting that either the second wave of the #pandemic is far from over, or that a third wave may have already begun.
2) Provincially, the number of #COVID19 outbreaks in the workplace rose for a second day in a row, up to 275 from 252 two days earlier. At this stage, it’s hard to gauge whether this increase is being driven by the more transmissible variants of concern.
3) But Quebec’s public health institute did declare its biggest single-day increase in the number of presumptive #COVID19 cases involving variants, with a cumulative total of 1,353, up by 133. The number of confirmed cases remained at 137.
Read 11 tweets
4 Mar
1) Premier François Legault warned on Wednesday evening that the Montreal region will be hit with an increase in the next few weeks of #COVID19 cases and hospitalizations fueled by the B.1.1.7 variant from the U.K. In this thread, I will assess the likelihood of this occurring.
2) Health Minister Christian Dubé noted that projections to be unveiled on Thursday morning will include a scenario of 2,000 to 3,000 daily #COVID19 cases and a range of 1,500 to 2,000 hospitalizations, back to where Quebec was in early January.
3) Dubé made those remarks after Quebec’s public health institute reported 125 more presumptive #COVID19 cases involving variants of concern, for a total of 1,220. The number of confirmed cases has remained at 137. Please see the chart below.
Read 15 tweets

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