Perspective: Here's the most revealing set of graphs I've seen in a long time. The UK's latest surge started about 33 days before the surge here in the US. 1/thread of 5
If the US case trend follows that of the UK, we'll have more than 200,000 cases a day by early September, possibly many more. See how the lines on the right are almost perfectly parallel. 2/5
What was somewhat reassuring is the relatively modest increase in the UK hospitalization rate. This suggests that because of the UK's very high rate of vaccination of seniors, the proportion of infections that are life-threatening is much lower. 3/5
But now look how US vs UK hospitalizations diverge. Keep in mind
1. The US surge started a bit over a month after the UK surge.
2. The US surge is likely to get much worse.
3. These are numbers not rates
With so many unvaccinated, this surge will be MUCH deadlier in the US. 4/5
But to end this thread with some good news: For reasons no one really understands, the UK rates recently plummeted. Could the US rate plummet if the surge was driven by the July 4 holiday, or if we mask up, or if we increase vaccination? Time will tell. We can decide.

5/end

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More from @DrTomFrieden

30 Jul
I’ve heard concern over the past few days about the impact of Delta, and questions about new guidance from the CDC. The bottom line is the virus has adapted and we must adapt too. Delta is different, but our vaccines are still doing their job. 1/thread
Earlier this week, CDC issued new guidance that everyone—vaccinated and unvaccinated​​—should wear masks indoors in areas with high rates of Covid. And last night, information was published referencing new evidence and new challenges posed by Delta. wapo.st/3lfovuy 2/
Delta is at least 2x as transmissible as the original virus, and appears to be among the more infectious viruses, estimated to spread about as readily as chickenpox. But Delta can be controlled, just as we’ve controlled chickenpox​​—through vaccination & other measures. 3/
Read 22 tweets
28 Jul
Thanks Dr. Rasmussen! Important points on the virology, but I believe the epidemiology is important also. We seem to agree there's a non-zero risk of strains emerging that aren't well protected against by current vaccines. We may disagree about how far from non-zero that risk is.
Yes, flu mutates faster—but we haven't seen two-fold changes in flu transmissibility in one season with one strain. With so much transmission, many new variants of SARS-CoV-2 are likely to continue to emerge.
There’s debate about whether vaccine-induced immunity can result in vaccine escape. As you correctly note, it’s not analogous to antibiotics, where use clearly drives resistance.
Read 8 tweets
26 Jul
What's scarier than Delta? These are three things I worry about.
1) The emergence of future variants that can escape vaccine-induced immunity. Delta may not be the worst variant the virus deals us. Continued uncontrolled spread around the world makes this scenario more likely.
2) Resistance to effective disease control measures such as masking & vaccination that results in many preventable deaths. We underestimate Covid at our peril. Listening to/addressing concerns of every community, and implementing proven ways to save lives must be our way forward.
Read 4 tweets
23 Jul
Schools will open in weeks in the US with the Delta variant spreading rapidly. What does this mean for kids—especially those under 12 who aren’t eligible for vaccination? How can we keep them safe? These are important questions that require practical, thoughtful answers. 1/thread
The Delta variant is much more transmissible than the original virus and makes up at least 83% of sequenced cases in the US. Although most adults are now fully vaccinated, that’s not the case for adolescents, and kids under 12 can’t be vaccinated yet. 2/
Good news: Most kids who get Covid will have mild or no symptoms, and there’s no evidence that Covid caused by the Delta variant causes more severe illness among kids. 3/
Read 18 tweets
21 Jul
I’m hearing from vaccinated people who are frightened about breakthrough cases, the Delta variant, and new waves of Covid. But it’s not vaccinated people who should be most concerned. Here’s what I expect to happen over the coming weeks. 1/thread
Globally, we’re far from the end of the pandemic. Delta is at least two times more contagious than the original virus, which means it will infect and kill more people. 2/
Many countries have so far avoided big surges but haven’t had access to the vaccines needed to vaccinate their populations. Many of these countries will likely see explosive spread of Covid over the coming weeks and months. 3/
Read 20 tweets
9 Jul
How big of a threat does the Delta variant pose? New developments show that the challenges we face in controlling Covid are immense. Millions of lives are at stake globally. 1/
It’s now clear that Delta spreads more readily than initial strains of Covid. It’s at least two times as infectious. bit.ly/3hLFTU0 2/
Delta may or may not be more deadly on a case-by-case basis, but because there are so many more cases, more people will get very sick, and more will die. 3/
Read 15 tweets

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