We've been falsely told 'schools are safe', 'don't drive community transmission', & teachers don't have a higher risk of infection repeatedly by govt & their advisors- to justify some of the most negligent policies in history. 🧵
Questions have to be asked about the evidence Jenny Harries gave to the Education Committee today about the risk to teachers.
— Adam Hamdy (@adamhamdy) January 19, 2021
Was she aware of this data?
If not, why wasn\u2019t she properly briefed?#COVID19 #schools https://t.co/4wa1PyAJld pic.twitter.com/eqFjaA1zYC
Why?
https://t.co/EcKP8Vq2yo
.@educationgovuk data released show on average the rate of Covid-19 infection is 1.9 times higher amongst primary & secondary teachers than the general population, & 2 times higher for special school teachers.
— National Education Union (@NEUnion) January 19, 2021
Read our full commenthttps://t.co/vNl0zUEiOi#MakeSchoolsSafe pic.twitter.com/FTHdKYZA8a
https://t.co/Bwu6QXm6Q1
I've been a hearing a lot about how children are more infectious *now* & contribute to transmission because of the B117 variant, but didn't before. This is a myth. Children & schools have always played an important role in transmission. Time to lay this to rest. Thread.
— Deepti Gurdasani (@dgurdasani1) January 5, 2021
https://t.co/nFrjbuTiPC
More from Deepti Gurdasani
I've heard a lot of scientists claim these three - including most recently the chief advisor to the CDC, where the claim that most transmission doesn't happen within the walls of schools. There is strong evidence to rebut this claim. Let's look at
The science shows us that most disease transmission does not happen in the walls of the school, but it comes in from the community. So, CDC is advocating to get our K-5 students back in school at least in a hybrid mode with universal mask wearing and 6 ft of distancing. https://t.co/dfvJ2nl2s4
— Rochelle Walensky, MD, MPH (@CDCDirector) February 14, 2021
Let's look at the trends of infection in different age groups in England first- as reported by the ONS. Being a random survey of infection in the community, this doesn't suffer from the biases of symptom-based testing, particularly important in children who are often asymptomatic
A few things to note:
1. The infection rates among primary & secondary school children closely follow school openings, closures & levels of attendance. E.g. We see a dip in infections following Oct half-term, followed by a rise after school reopening.
We see steep drops in both primary & secondary school groups after end of term (18th December), but these drops plateau out in primary school children, where attendance has been >20% after re-opening in January (by contrast with 2ndary schools where this is ~5%).
First, there is strong evidence to support increased transmissibility of B117 - current estimates of increased transmissibility range between 30-70% - from epidemiological evidence examining the differential rate of growth of B117 with respect to other variants & increase in R
There is also evidence from PHE contact studies that the risk of transmission from those carrying the B117 variant is ~50% greater than with other non-B117 variants.
Increased transmissibility, even if a variant has the same fatality rate can increase deaths substantially, because the rate of growth of cases is higher- & more cases means more deaths.
Increased fatality rates also increase deaths- but do so
How dangerous are the B.1.1.7 and 501Y.V2 hyper-transmissible strains?
— Eric Topol (@EricTopol) January 11, 2021
by @AdamJKucharski @CFR_orghttps://t.co/aycWMN3b5h
h/t @Karl_Lauterbach pic.twitter.com/JlaFzzP06t
So how was risk of death with the variant studied?
We don't routinely sequence all samples for the virus. We've found that the variant has a particular deletion which means that some PCR tests on samples with the variant give a different read-out when the variant is present.
More from Education
1/16
When a teaching award is based solely on teaching evals and then only men get it. pic.twitter.com/szIBkCvTe9
— Dr. Marissa Kawehi (@MarissaKawehi) February 12, 2021
When I say "anyone": needless to say, the people who are benefitting from the bias (like me) are the ones who should helping to correct it. Men in math, this is your job! Of course, it should also be dealt with at the institutional level, not just ad hoc.
OK, on to my email:
2/16
"You may have received automated reminders about course evals this fall. I encourage you to fill the evals out. I'd be particularly grateful for written feedback about what worked for you in the class, what was difficult, & how you ultimately spent your time for this class.
3/16
However, I don't feel comfortable just sending you an email saying: "please take the time to evaluate me". I do think student evaluations of teachers can be valuable: I have made changes to my teaching style as a direct result of comments from student teaching evaluations.
4/16
But teaching evaluations have a weakness: they are not an unbiased estimator of teaching quality. There is strong evidence that teaching evals tend to favour men over women, and that teaching evals tend to favour white instructors over non-white instructors.
5/16