Oh dear, this government clearly does not care about Covid-19 transmission.Transmission. If it did, it would get its comms right. m.facebook.com/story.php?stor…
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"You should self-isolate if you have a positive test or if you have been contacted by "NHS" test and trace."
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People are infectious soon after being infected, before developing symptoms. By the time most people will have the symptoms for ~24 hours before it clicks that they have symptoms, another 24-48 hours before they have a test, another 24-48 hours before they get the result…
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By then they could already have infected most of the people they had the potential to infect.
It should say "You AND YOUR CONTACTS must self-isolate from the moment you realise that you have developed symptoms".
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This is good news. Some thoughts about Covid-19 vaccinations and mRNA vaccines in particular.
2/11
The R0 for Covid-19 is about 2.5.
If it were 3 you'd have to get 2 out of every three people who would otherwise have caught it immune, so they don't catch it and pass it on. If it's less, you have to get fewer people immune in order to achieve population (herd) immunity .
3/11
It is really important that people understand their part in TTIS (test, trace, isolate and support)…
Have you or someone you live with had a cough or other symptoms and been tested for Covid-19?
Was it made clear that all of you - all the people you live with - should stay at home and avoid contact with others from ASAP after the symptoms started, for…
Where can I find definitions of "sterilising vaccine" and "neutralising vaccine"?
2/ Nobody has replied, and I can't remember what I was reading that prompted the question. So I'll say what I think the answer is!
At least for "sterilising vaccine" (or, if you use US spelling, "sterilizing vaccine".
3/ A sterilising vaccine is one which provides sterilising immunity.
"Sterilizing immunity means that the immune system is able to stop a pathogen, including viruses, from replicating within your body." thehill.com/changing-ameri…
Following on my marathon thread on testing ( threadreaderapp.com/thread/1308088… ), some thoughts on the app, which is due to be launched this week.
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Most people with Covid-19 will never be identified.
Most never have symptoms. Few will be tested, and the test misses 70% of sick people, and even more of those without symptoms.
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Which means, the app will only ever identify a fraction of people with Covid-19.
So not having been alerted that you've been in contact with somebody who might be infectious won't mean you haven't been.
Diagnosis of SARS-CoV2 is far from straightforward. It includes-
Identifying cause of new, significant illness.
Identifying people who are potentially infectious.
Identifying people with late complications.
We are particularly concerned, now, about identifying people who could infect others.
Difficult, since most infections are in people with no or minor symptoms.
This may explain the clamour for tests.
But tests are very poor at identifying these people.
We know that - in sick adults - a single PCR tests will miss >=30% of cases. (Two tests will still miss >=20%.) In asymptomatic but infectious people it will miss more of the cases; and it cannot detect people who have been infected, but are not yet infectious.
Particularly since I've been reporting via covid.joinzoe.com for weeks.
1/9
Interesting to hear more about the wide range of symptoms you can get. The classic 3 symptoms at eg gov.uk/government/pub… were the most discriminatory symptoms in people I'll enough to be admitted to hospital.
2/9
In milder cases - and especially in children - other symptoms are as or more common. Eg fatigue, loss of appetite (skipping meals), rashes, diarrhoea.
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