The latest data from the UK’s Office for National Statistics show that over 1 million people in Great Britain are estimated to be living with long COVID.

Nearly 400 thousand of these have been living with long COVID for at least one year.

A thread. 🧵
ons.gov.uk/peoplepopulati…
The most common symptoms reported by people living with long COVID were fatigue, shortness of breath, muscle pain, and difficulty concentrating.

However, it is possible that some of these symptoms could be attributable to a cause other than long COVID in at least some people.
Of the people living with long COVID, nearly two-thirds (63.7%) reported some limitation in their daily activities.

Nearly one in five (18.8%) reported that they were limited a lot. That means at least 192,000 people in the UK now experience disability as a result of long COVID.
When these figures are put in context of the total population, about 1.5% of people living in the UK aged 35-69 years now experience at least some limitation in their daily activities as a result of long COVID.

That’s a lot.
The impact of long COVID appears to be less substantial in children and adolescents compared to adults, consistent with COVID-19 generally being less severe in younger age groups.

Nonetheless, in absolute terms, a large number of children and adolescents are affected.
Healthcare workers, social care workers, retail workers, and teachers were most likely to report long COVID, but this was likely explained by increased risk of being infected.

Odds of reporting long COVID by occupation are shown below.
These findings clearly show the impact of COVID-19 extends well beyond premature mortality.

COVID-19 has substantial health, social, and economic costs that are not reflected in mortality statistics.

This negative impact on quality of life is important and under-recognised.

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More from @DrZoeHyde

4 Jun
New data from England confirm the B.1.617.2 (delta) variant (which originated in India), is more concerning than B.1.1.7 (alpha/UK).

Household secondary attack rate is increased 1.5 times. Hospitalisation is increased 2.6 times. Schools are playing a major role in its spread. 🧵
Remember the B.1.1.7 (alpha/UK) variant is more transmissible than the original strain, and more likely to lead to hospitalisation.

The increase in attack rate and risk of hospitalisation seen with B.1.617.2 is *on top of* the increase seen with B.1.1.7.
There are now clear signs of a growing B.1.617.2 epidemic in the UK.

While cases caused by the B.1.1.7 (alpha/UK) variant are decreasing, B.1.617.2 cases are growing. The majority of S-gene positive cases depicted in green in the graph below are likely to be B.1.617.2 cases.
Read 6 tweets
2 Jun
Representative antibody study of Iquitos, Peru, after their devastating 1st wave. Over two-thirds of the sample had SARS-CoV-2 antibodies, suggesting 70% of the city had been infected. Children were more likely to have antibodies than adults (except >=60).
thelancet.com/journals/langl…
Although 70% of the city’s population had previously been infected, this was insufficient to prevent a second wave beginning in January 2021 caused by the P.1 variant. This suggests herd immunity can’t be reached by natural infection, which is less effective than vaccination.
Interestingly, a very high proportion of children had been infected, despite school closures. However, Iquitos is a very poor city and most residents have to leave home to purchase food on a daily basis. Children are likely more exposed to the community than in other settings.
Read 5 tweets
31 May
Study of 3 UK variant (B.1.1.7) outbreaks in childcare centres in Hesse, Germany, showing that children and adults were similarly likely to be infected, and that children and staff were similarly likely to transmit the virus to their household contacts. 🧵
eurosurveillance.org/content/10.280…
In this study, outbreaks were studied in 3 childcare centres.

Except for one childcare centre, where more adults than children were infected (53 vs. 31%), an equal proportion of children and adults were infected (27-28% in centre 2, and 17% in centre 3).
The authors then looked at the household contacts of the infected staff and children.

Overall, they found that 37% of contacts were infected (32% of child contacts and 39% of adult contacts).
Read 7 tweets
29 May
(1/4) Vietnam has reported the emergence of a variant which combines elements of the UK (B.1.1.7) & Indian (B.1.617.2) variants. According to the Health Minister it could spread “very fast” in the air.
➡️ straitstimes.com/asia/se-asia/v…

Vietnam is struggling to contain the new variants. Image
(2/4) A common feature of coronaviruses is their ability to exchange their genetic material (recombination).

This probably happens in all infected people. As the virus reproduces, its copies may exchange genetic material with each other.

Most changes are probably unremarkable.
(3/4) But it’s also possible for people to be infected with different variants at the same time. This is riskier. The more community transmission there is, the more likely this is to occur.

Recombination events like this have been detected in the UK.
virological.org/t/recombinant-…
Read 7 tweets
22 May
1. What proportion of the population needs to be vaccinated to achieve herd immunity? It depends on a number of factors, including how contagious a virus is, and how well a vaccine can prevent infection.

Even very contagious variants can be stopped if efficacy is high enough. 🧵
2. This is a very simple model with lots of assumptions, but gives a rough idea of what we need to aim for to achieve herd immunity against SARS-CoV-2.

Four theoretical vaccines are shown, with 60 to 90% efficacy against infection.
3. Vertical lines mark estimates of the contagiousness of the original strain of SARS-CoV-2, the UK (B.1.1.7) variant, & the Indian (B.1.617.2) variant.

The proportion of people needing to be vaccinated (vertical axis) is the point where the vaccine & variant lines intersect.
Read 10 tweets
9 May
🧵 The Indian variant has me worried, and I fear Europe could be headed for a third/fourth wave if it’s not contained.

If you can’t get a FFP2/N95 mask, follow the tips below and in this video by @SandhyaRamanat1 to improve the effectiveness of your mask.
I hope I’m wrong about the variant, but there are warning signs from multiple countries that the Indian variant is more transmissible than the UK variant.

This means that the measures that previously worked to keep people safe may not be enough now.
It does not mean that the situation is hopeless (it isn’t), or that getting infected is inevitable (it’s not).

The variant can’t break the laws of physics, so masks and ventilation still work. But you may have to step them up (i.e., use better masks, and increase ventilation).
Read 6 tweets

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