This is really quite something, although not unexpected given what we have seen. BCCDC would really benefit from adopting a privacy framework instead of just relying on as-hoc decisions.
It’s really hard to rationalize why publishing weekly counts for Richmond is just fine by doing the same for Burnaby or Surrey would be an “unreasonable invasion of privacy”.
In fact it’s really hard to rationalize disclosure risk at much finer geographies like FSA or City Neighbourhood, when we already identify the existence of cases in school communities.
With fairly large denominators and comparably small numerators the main disclosure risk is people concluding that someone isn’t confirmed to have covid. As is the case with students in a school with no exposure notification. This whole thing is just ridiculous.

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More from @vb_jens

1 Dec
The new Health Region level maps are up, and 10yo did a quick scrape of the data. It's for the week ending this past Thursday. Trends have gotten worse for that past week, although there is slight a caveat (at the end of this thread).
Version with regions stable so people can better follow their favourite health region.
And the map version, things are getting very red across Metro Vancouver. Just to pre-empt the usual comments, I won't adjust the colour scale, it's the case numbers that are too night not the colours that are wrong.
Read 6 tweets
1 Dec
Looks like the data backlog is cleared and we got a full week of new data! And revised data for a bit longer changing the earlier trend that we saw. Trend is again showing signs of slowing growth, but we have been here before... Image
Vancouver Coastal is showing a decline. Fraser exhibits signs of slowing growth, but also has very high volatility in the numbers. Each of Island, Interior and Northern are showing higher growth rates than the VCH and FH, which is also evident in their combined trend. Image
Of course these tweets might be obsolete again in half an hour if BCCDC again pulls the update as happened last week and also the week before that. ¯\_(ツ)_/¯
Read 4 tweets
27 Oct
Thread trying to make sense out of why we still don't have the covid alert app in BC. Yesterday the PHO said that the app in the current form is not useful to augment contact tracing in BC, speaking about this starting at 39:35
The key point seems to be that the covid alert app is designed for maximal privacy, which comes with tradeoffs as to how much information people notified of an exposure and by extension PHO get. In particular the APP is designed so that users won't know when the exposure occurred
In practice this means the app is casting a wide net. Anyone that came into "close contact" with an infected person over the 14 days prior will get notified, even though the infected person likely wasn't infectious for the entire 14 day period.
Read 10 tweets
17 Oct
Folding in today's data release BC looks like it's on a clear upward trajectory again. This is not good. The time for coordinated counter measures was probably two months ago, but better late than never. This train is moving in the wrong direction and need to get off.
Fraser is driving this trend, and we might want to think about a regionally differentiated response. But it's not clear to me that the boundaries between Fraser and Vancouver Coastal at that meaningful, looking at finer geographies would make it easier to tailor the response.
For comparison, people in SK are worried about their 7 day incidence reaching 5 cases per 100k in the near future. From BC's perspective those numbers sounds really nice, Fraser is at 33 right now and Vancouver Coastal is at 25.
Read 4 tweets
16 Oct
Catching up with yesterday's press briefing, some of the answers of the PHO are disappointing. On including private tests: "some of those are included", "even without those our testing rates remain low". What are the rates? How many are "some"?
And why has the PHO, week after week, been pointing to positivity rates that include private routine asymptomatic testing as evidence that we are doing well when they now nonchalantly point out that this (of course) skews the positivity rate.
The blurring of lines between routine asymptomatic testing with asymptomatic testing in response to an exposure event is also very unhelpful. The PHO must understand the difference, and blurring the line between these is distracting from prioritizing effective TTI strategies.
Read 10 tweets
9 Oct
The question why Canada learned so little from its SARS experience is interesting. After all, much of the success of Taiwan fighting Covid-19 is due to their action plan developed in response to SARS. cbc.ca/news/health/co…
The senior advisor to the original SARS report has written a follow up looking at where things broke down in the Canadian covid-19 response, focusing on failures to protect health care workers and how Canada mismanaged the response. atimeoffear.com
The whole report is worth a close read, but one section that was of particular interest to me is the one on data. And how lessons from data failures during SARS weren’t implemented. While focused on health care workers, the data failures extend far beyond that.
Read 11 tweets

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