Share this page!

Dr. Theresa Tam Profile picture
Twitter logo
Jul 6 • 6 tweets • 3 min read
1/5 Today, the COVID-19 Immunity Task Force (CITF) announced seroprevalence results from 21 studies funded by the Government of Canada, estimating the level of infection during the Omicron wave up to the end of May 2022. covid19immunitytaskforce.ca/the-omicron-ts…
2/5 Antibodies to certain blood proteins known as “nucleocapsids” only develop in those who’ve been infected. So detecting their presence in blood (seroprevalence) is a way to estimate the proportion of people with past #SARSCoV2 infection.
3/5 CITF results confirm the massive scale of the #Omicron wave. Before Omicron arrived in Dec 2021, ~7% of Canadians had infection-acquired antibodies to #SARSCoV2. Then from Dec 2021 to May 2022, that proportion rose to 45%!
4/5 Seroprevalence due to #COVID19 infection increased steeply in all ages during the Omicron wave, an increase that was steeper among younger vs. older Canadians and in Western vs. Eastern provinces (no data available for the territories).
5/5 As both infection-acquired and vaccine protection decrease over time, #VaccinesPlus continues to be strongly recommended. Keeping up-to-date with #COVID19Vaccines + #WashMaskSpace improves protection.
canada.ca/en/public-heal…
CORRECTION: The last line should say the proportion rose “by” 45%.

• • •

Missing some Tweet in this thread? You can try to force a refresh
　

Keep Current with Dr. Theresa Tam

Dr. Theresa Tam Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @CPHO_Canada

Dr. Theresa Tam Profile picture
May 11
1/5 The Public Health Agency of Canada is aware that @SickKidsNews has reported cases of acute hepatitis of unknown origin in children to @ONTHealth. This is a relatively rare condition that does occur in Canada. In many cases, an underlying cause cannot be found.
2/5 Information on these and other cases is being further reviewed by health authorities. Those that meet the case definition will be reported to @GovCanHealth to be included in the national investigation.
3/5 We do not know if we are seeing an increase in the number of cases of acute hepatitis of unknown cause in children. More information is needed to assess the situation and any potential risks to people in Canada.
Read 5 tweets
Dr. Theresa Tam Profile picture
May 9
1/5 #COVID19 key concerns 🇨🇦 : as public health measures have eased and we resume more activities and connections, other serious infectious diseases, such as influenza and measles, are making a comeback. canada.ca/en/public-heal…
2/5 #COVID19 is still circulating across the country and Canada is reporting increased #influenza activity in recent weeks, late in the 2021-22 season. This includes the first outbreaks and a sharp rise in influenza detections, mostly in ages <45 years.
canada.ca/en/public-heal…
3/5 .@UNICEF & @WHO report a 79% increase in worldwide measles cases in Jan-Feb 2022 compared to the same time last year, a worrying sign of overall heightened risk for spread of vaccine preventable diseases (VPD) that could trigger larger outbreaks.
who.int/news/item/27-0…
Read 5 tweets
Dr. Theresa Tam Profile picture
Apr 19
1/4 #COVID19 key concerns 🇨🇦 : after weeks of increasing transmission, hospitalisation rates are rising in many jurisdictions and across most age groups. Rates of hospital/ICU admission/death remain highest in older adults, aged ≥60 years.
health-infobase.canada.ca/covid-19/epide…
2/4 With #COVID19 still spreading widely in Canada, it’s not too late and very important to get the best possible protection against severe illness by keeping #COVID19Vaccines up-to-date, including #COVID19Booster dose(s) as recommended. canada.ca/en/public-heal…
3/4 Evidence shows that 2 doses of mRNA #COVID19Vaccines generally maintain good effectiveness against severe outcomes across variants, and a booster further increases vaccine effectiveness to over 90% against severe outcomes. canada.ca/en/public-heal…
Read 4 tweets
Dr. Theresa Tam Profile picture
Apr 1
1/7 Today #PHAC released an Update on #COVID19 in Canada: Epidemiology & Preparedness, which underscores the need for ongoing work to prepare for futures challenges as the #SARSCOV2 virus continues to circulate and evolve. canada.ca/content/dam/ph…
2/7 Although Canada’s overall high vaccination coverage and a range of surveillance, public health measures, treatments & other tools can better protect us going forward, we must still prepare for possible resurgence this spring and fall.
3/7 #PHAC is preparing against two key scenarios for the longer-term. A realistic scenario could be one in which we have low-moderate ongoing #SARSCOV2 transmission in Canada, with intermittent waves as new variants emerge or immunity wanes.
Read 7 tweets
Dr. Theresa Tam Profile picture
Apr 1
1/4 #COVID19 key concerns 🇨🇦 : not unexpectedly, ⬆️ in-person activities following easing of public health measures, together with spread of the more transmissible BA.2 variant and some waning of immunity, may be contributing to ⬆️ transmission. canada.ca/en/public-heal…
2/4 Average daily cases have increased by 28% vs. last week, indicating resurgence is underway nationally (Mar 25-31, 2022); also 7-day lab test positivity (Mar 23-29) ⬆️ to 16% and wastewater signals are ⬆️ in many localities.
3/4 Although overall high vaccination rates are expected to lessen the impact on hospitals, severe illness trends have begun to increase in many jurisdictions (range 3%-27% weekly ⬆️ in daily number of patients with #COVID19 in hospitals).
Read 4 tweets
Dr. Theresa Tam Profile picture
Feb 13
1/5 #COVID19 key concerns 🇨🇦: while we’ve passed peak #omicron, measures are still needed to relieve the pressure on our hospitals. In particular, closing vaccine coverage gaps and maintaining core personal protective practices. canada.ca/en/public-heal…
2/5 In particular, millions of eligible Canadians could reduce their risk of ending up in hospital with severe COVID-19 disease by getting up-to-date with #COVID19Vaccines/mRNA #Booster as eligible/ recommended.
3/5 Evidence shows two doses of #COVID19Vaccines offer reasonably good protection against severe disease, and getting an mRNA booster dose as eligible offers superior protection, keeping more people out of hospital and preventing more deaths.
Read 5 tweets

Did Thread Reader help you today?

Support us! We are indie developers!

This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us on Twitter!

:(