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…
4) And on Sunday, thousands of protesters gathered in front of the National Assembly to urge Premier François Legault to loosen restrictions on sports. Although the overwhelming majority of demonstrators wore masks, there were a few anti-maskers in the crowd.
5) With #pandemic fatigue having set in long ago and spring around the corner, Quebecers are understandably eager to return to their normal routines before #COVID19, especially with the success of the vaccines. The problem is the proliferation of the variants.
6) On Sunday, Quebec posted 124 more presumptive cases involving the more contagious #COVID19 variants for a cumulative total of 1,700. And with the return to class of thousands of students on Monday, the province is likely to experience an increase in such cases.
7) Meanwhile, Quebec reported a total of 592 #COVID19 hospitalizations, the lowest tally since Nov. 16. None of Montreal’s 17 acute-care hospitals recorded any new #pandemic admissions on Saturday, the first time this has occurred in weeks.
8) Despite a few #COVID19 outbreaks in eldercare homes, there were 281 active cases in long-term care centres and seniors’ residences across Quebec. That compares with nearly 10 times as many cases in early January.
9) Vaccinators administered 15,329 first shots on Saturday, with more than 10,000 given in Montreal. To date, 6.5% of the Quebec population has been vaccinated, the highest rate of any province. Given this remarkable progress, it will be hard to counter the “Peltzman Effect.”
10) It’s worth stating the obvious: this #pandemic is far from over, as the #COVID19 surges in Europe and Brazil attest. The variants are on the march, and Quebec is far from achieving collective immunity against the #coronavirus. End of thread. Please limit your social contacts.

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More from @Aaron_Derfel

9 Mar
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.
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
3 Mar
1) Strange things are now happening in the #pandemic in Montreal at this juncture, with #COVID19 cases plummeting but hospitalizations rising, and the much more contagious B.1.1.7 variant circulating. In this thread, I will try to make sense of these cross currents.
2) For three days in a row, #COVID19 hospitalizations have crept up in Montreal. The total rose by six to 358 on Tuesday, with the Jewish General, Sainte-Justine, the Royal Victoria, the Lakeshore General, Santa Cabrini and Notre Dame posting modest increases in admissions.
3) Normally in this #pandmemic, #COVID19 cases increase first, followed by a rise in hospitalizations about two weeks later and then a spike in deaths two or three weeks afterward. But in the last few days, hospitalizations have gone up as cases have dwindled.
Read 11 tweets

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