Results for “first doses first” 93 found
A new study looking at essentially the entirety of the Scottish population finds that both the Pfizer and AstraZeneca vaccine work very well at preventing hospitalizations from the first dose.
UK policy for use of vaccines against COVID-19 involves an offer of a first dose followed by a second dose 12 weeks later. To our knowledge, this is the first study of COVID-19 vaccine effect against hospitalisation for an entire nation after a single dose of vaccine. We found that a single dose of BNT162b2 COVID-19 vaccine was associated with a vaccine effect (VE) of 85% (95% CI 76 to 91) for COVID-19 hospitalisation 28-34 days post-vaccination. A single dose of ChAdOx1 vaccine was associated with a vaccine effect 94% (95% CI 73 to 99) at 28-34 days post-vaccination. VEs increased over time with a peak at 28-34 days post-vaccination for both vaccines. Comparable VEs were seen in those aged ≥80 years for prevention of COVID-19 hospitalisation with a high combined VE of 81% (95% CI 65 to 90) at 28-34 days post-vaccination.
Arne Akbar, president of the British Society for Immunology, noted “…overall these new findings should provide reassurance around the UK’s decision to offer the two doses of the vaccine 12 weeks apart.”
Another important point is that the AstraZeneca vaccine actually shows a higher effectiveness than the Pfizer vaccine. The study wasn’t designed to compare the vaccines and the populations getting the vaccines aren’t random samples. Nevertheless, the AstraZeneca vaccine appears to work well and it was actually given to a greater proportion of elderly patients.
The new results from Scotland support the UK, EU, and WHO decisions to authorize the AstraZeneca vaccine. If the US had authorized the AstraZeneca vaccine in late December at the same time as did the UK, millions more Americans could have been vaccinated saving many lives.
Where is the FDA’s cost-benefit calculation?
AP: Hungarian health authorities were the first in the EU to approve the Sinopharm jab for emergency use on Jan. 29. That came after a government decree streamlined Hungary’s vaccine approval process by allowing any vaccine administered to at least 1 million people worldwide to be used without undergoing review by the country’s medicines regulator.
The country expects to receive 5 million total doses of the Sinopharm vaccine over the next four months, enough to treat 2.5 million people in the country of nearly 10 million.
Authorize any vaccine already used by at least 1 million people is a type of reciprocity or peer-review rule in which you speed up approval in your country based on data from another country. As with all such rules, it’s imperfect–new and extensive use will reveal common, serious side effects and many uncommon ones as well but extensive use is not a guarantee of safety or efficacy. Nevertheless, when time is of the essence the 1 million+ rule is a smart rule.
Hat tip: Bart Madden.
Steven Joffe, MD, MPH, a medical ethicist at the University of Pennsylvania, said he doesn’t believe clinicians “should be lowering our standards of evidence because we’re in a pandemic.”
Link here. That sentence is a good litmus test for whether you think clearly about trade-offs, statistical and speed trade-offs included, procedures vs. final ends of value (e.g., human lives), and how obsessed you are with mood affiliation (can you see through his question-begging invocation of “lowering our standards”?). It is stunning to me that a top researcher at an Ivy League school literally cannot think properly about his subject area at all, and furthermore has no compunction admitting this publicly. As Alex wrote just earlier today: “Waiting for more data isn’t “science,” it’s sometimes an excuse for an unscientific status-quo bias.”
To be clear, we should run more and better RCT trials of Ivermectin, the topic at hand for Joffe (and in fact Fast Grants is helping to fund exactly that). But of course the “let’s go ahead and actually do this” decision should be different in a pandemic, just as the “just how much of a hurry are we in here anyway?” calculus should differ as well. I do not know enough to judge whether Ivermectin should be in hospital treatment protocols, as it is in many countries, but I do not condemn this simply on the grounds of it representing a “lower standard.” It might instead reflect a “higher standard” of concern for human lives, and you will note the drug is not considered harmful as it is being administered.
If you apply the standards of Joffe’s earlier work, we should not be proceeding with these RCTs, including presumably vaccine RCTs, until we have assured that all of the participants truly understand the difference between “research” and “treatment” as part of the informed consent protocols. No “therapeutic misconception” should be allowed. Really?
If the pandemic has changed my mind about anything, it is the nature of expertise.
Canada has made some smart moves with the Novavax vaccine. First, they initiated a rolling review of the Novavax vaccine in late January which suggests that they might authorize the vaccine based on the British trial before the US trial is concluded. The FDA will probably wait until the US trial is concluded. Second, Canada also signed a production agreement to bring some capacity online in Canada, although that will take time. That agreement, however, is on top of an advance purchase of 52 million doses with an option on another 24 million doses.
In short, if they act quickly, Canada could approve the Novavax vaccine before the United States and get a jump on its own vaccination efforts.
The contentiousness is much worse in Europe, where zero- and negative-sum thinking is the order of the day. That is the theme of my latest Bloomberg column, here is one bit:
In most of Europe, it’s hard to see much good news. It’s one thing not to have a vaccine. It’s far worse to turn on television or go on the internet and see people in other countries being vaccinated as their pandemics recede. Most of Europe will not be making significant vaccination progress until April, and even then shortages may remain.
At stake is the very legitimacy of the EU. Most of the vaccination contracts were handled at the EU level, although Germany sidestepped the agreed-upon procedures and cut some deals. If the EU fails at the most significant crisis in a generation, it may not maintain much legitimacy.
When people judge how painful an experience was, they often place a high value on first and last impressions. The last impressions of the U.S. and U.K. will be pretty positive. Most of the U.S. pandemic will be over by July, even under a subpar vaccination schedule. And it may turn out that mRNA vaccines are more protective against the new strains of Covid than any alternatives….
Many European countries may end up with fewer deaths per capita than the U.S. But at the end of the pandemic many Europeans may feel like their leaders failed them, that they suffered lockdowns for many months but received little in return. Right now vaccine politics is all about momentum, and so far only a few countries have it.
From an email to Fairfax County teachers:
Due to a decrease in vaccine allocation, we are temporarily reducing appointment availability over the coming weeks. Vaccine supply is fluid across the country, and we are matching currently scheduled appointments to anticipated inventory.
We are pleased to share that more than 22,000 Fairfax County Public Schools teachers and employees have already been able to schedule their first shot. At this time we are honoring those who have current appointments. Should our vaccine supply not be sufficiently replenished, we will suspend initial appointments (first doses) for eligible individuals in 1b and prioritize those who require their second vaccine dose in the weeks to come.
It’s really quite stunning when you think about it.
Hat tip: Max.
According to the Guardian the First Minister of Wales explained their policy of doling out the Pfizer vaccine evenly over the next six weeks:
the Pfizer vaccine has to last us until into the first week of February.
…We won’t get another delivery of the Pfizer vaccine until the very end of January or maybe the beginning of February, so that 250,000 doses has got to last us six weeks.
That’s why you haven’t seen it all used in week one, because we’ve got to space it out over the weeks that it’s got to cover.
Bonkers! A vaccine isn’t like a limited supply of water that needs to be rationed until you arrive at the next oasis. The sooner you get the vaccine out the better! Start lowering R now! If you run out of vaccine, well scarcity is bad but running out means that at least one part of your system is working well! It’s a bad idea to kill people to make it look like you are following some sort of numerically neat plan.
One year into the pandemic and people still don’t understand vaccines or viral growth.
Hat tip: Arthur Baker.
Pepvar’s first goal should be supporting the production of enough doses to vaccinate the entire world within a year. It is estimated that building such capacity for an mRNA vaccine like Moderna’s would cost less than $4 billion — that’s significantly less than the U.S. government already spends each day on Covid-19 relief — with the cost about $2 per dose. Of course, making the vaccines is just the first step: Pepvar must
People, even if that estimate is off by a factor of ten or more…etc. Here is the NYT link, bJames Krellenstein, Peter Staley and .
Here is the source, of course Alex Tabarrok was there first. For now give everyone one dose rather than two, and enjoy the partial but more broadly spread protection. Here are the reactions from two epidemiologists:
Professor Wendy Barclay, from the department of infectious disease at Imperial College London, said Mr Blair’s idea was interesting but agreed it was “too risky” to try without further evidence.
And Professor Neil Ferguson, also from Imperial, added that the UK regulator had authorised the vaccine on the basis that people would receive two doses.
Administering one dose only would require “an entirely different regulatory submission”, he told a Commons committee.
A Department of Health and Social Care spokesperson said: “Over the coming weeks and months, the rate of vaccinations will increase as more doses become available and the programme continues to expand.”
Where are their cost-benefit analyses? Letting people get infected at current and indeed accelerating rates is also “too risky,” yes? Is there an epidemiologist or public health expert out there willing to show his or her work, either for or against this idea? A genuine query, and of course comments are open. How about one dose for Moderna only? If we are to defer to their expertise, they do actually have to step up and be the experts, right?
I’ve been arguing that we should delay the second dose (or at least not hold back first doses) in order to hit the virus hard and inoculate more people on the first dose. I wrote:
We should vaccinate 6 million people with first dose NOW. It is deadly cautious to hold second dose in *reserve*. Supply chain will be ok and the exact timing of the second dose is not magical and likely not critical. In the accidental low-dose, standard-dose regime for the AZ vaccine, people got the second dose 7 to 8 weeks after the first dose and that was the 90% efficacious regime. [A different vaccine obviously but ] Exact timing of the second-dose does not seem critical, although everyone should get a second dose.
Today epidemiologist Michael Mina and writer Zeynep Tufekci, who has been ahead of the curve on much of the discussion, make the case even more strongly in the NYTimes:
First, the science. While the vaccine trials were designed to evaluate a two-dose regimen, some immunity might be acquired before a second dose is administered. We know, for instance, that a Covid-19 infection appears to yield protection for at least six months. While infections are not vaccinations, and while we need more data on this, it’s plausible that the immunity gained from a vaccination may turn out to be even stronger than what comes from an infection. The reason we do a second — booster — vaccination is that these later doses help to solidify immune memory, in part by giving extra training to the cells that produce antibodies, a process called affinity maturation. But this process begins with the single dose, and the evidence collected between the time of the first and second doses in tens of thousands of people in the Phase 3 trials suggests that the level of affinity maturation may provide enough protection to meet the standards we have set for vaccine approval during this pandemic even without the second dose.
While we know that the single dose can protect against disease, we don’t yet know how long this immune protection will last, and at what level. However, there is no rule that says that vaccines must be boosted within weeks of each other. For measles, the booster dose is given years after the first dose. If the booster dose could be given six months or a year after the first dose, while maintaining high efficacy before the second dose, that would allow twice as many people to get vaccinated between now and later next year, accelerating herd immunity — greatly helping end the crisis phase of the pandemic in the United States.
… we should begin immediate single-dose trials, recruiting volunteers from low-risk populations who are first in line for the vaccinations. For example, among health care workers protective equipment works, rates of infection among this group have fallen sharply and severe disease is much more rare.Younger essential workers without risk factors are less likely to be severely affected if they are exposed since this disease’s impact rises steeply with age. Just as tens of thousands of people volunteered for the earlier vaccine trials, many may well volunteer to test a placebo against a second dose, allowing us to quickly ascertain questions of durability and effectiveness of the single dose.
Two additional points. First, mix and match, as I argued earlier, may be beneficial:
…we could mix and match vaccines. The UK will run a trial on this question. Mix and matching has two potentially good properties. First, mix and matching could make the immune system response stronger than either vaccine alone because different vaccines stimulate the immune system in different ways. Second, it could help with distribution. It’s going to be easier to scale up the AZ vaccine than the mRNA vaccines, so if we can use both widely we can get more bang for our shot.
Second, an economics issue. If we want Pfizer and Moderna on board we need to pay them not just to run the clinical trials but to be happy with potentially selling half as many doses. Incentives matter.
From the FDA report:
Two doses is great but one dose already looks good even though sample is small. “Efficacy against severe COVID-19 occurring after the first dose was 88.9%.” (Added. n.b this is over the entire sample.)
Based on the number of cases accumulated after Dose 1 and before Dose 2, there does seem to be some protection against COVID-19 disease following one
dose; however, these data do not provide information about longer term protection beyond 21 days after a single dose.
This is potentially important as we could vaccinate more people in a hot-spot and potentially delay the second dose. Noting, however, that this is a post-hoc analyses and the second dose came within 3 weeks.
As expected, a bit of pain, swelling and fatigue in a minority of participants are the biggest issues. No major safety concerns. Of course, we still need to monitor long-term.
Serious adverse events, while uncommon (<1.0%), represented medical events that occur in the general population at similar frequency as observed in the study…. No specific safety concerns were identified in subgroup analyses by age, race, ethnicity, medical comorbidities, or prior SARS-CoV-2 infection.
Hat tip: Biostatistician LucyStats.
Since back in April, Michael Kremer, myself, and the AHT team have been advising governments to go big on investing in vaccines. The US, to its credit, made early purchases but they made two mistakes. First, they didn’t buy enough as the Washington Post indicates:
Last summer, Pfizer officials had urged Operation Warp Speed to purchase 200 million doses, or enough of the two-shot regimen for 100 million people, according to people knowledgeable about the issue who spoke on the condition of anonymity because they weren’t authorized to discuss the situation. But the Warp Speed officials declined, opting instead for 100 million doses, they said.
“Anyone who wanted to sell us … without an [FDA] approval, hundreds of millions of doses back in July and August, was just not going to get the government’s money,” said a senior administration official.
But last weekend, with an FDA clearance expected any day, federal officials reached back out to the company asking to buy another 100 million doses. By then, Pfizer said it had committed the supply elsewhere and suggested elevating the conversation to “a high level discussion,” said a person familiar with the talks who spoke on the condition of anonymity because they were not authorized to share the conversation.
In our discussions, we were talking about at least a $70 billion dollar program and optimally double that and we continually faced the sticker shock problem. Investing in unapproved vaccines seemed risky to many people despite the fact that the government was spending trillions on relief and our model showed that spending on vaccines easily paid for itself (the mother of multipliers!). I argued that this was the world’s easiest cost benefit calculation since Trillions>>Billions. But it was hard to motivate more spending—not just in the United States but anywhere in the world. For reasons I still don’t understand anything out of the ordinary–big spending on at-risk vaccines, spending on testing and tracing, challenge trials–was met with a kind of apathy and defeatism. As I said in July:
Multiple people [in Congress] have told me that things move slowly, no one is stepping up to the plate, leadership is absent. “Who is John Galt?,” they sigh. Ok, they don’t literally say that, but that sigh of resignation is what it feels like in the United States today at the highest levels of government.
OWS was actually the one area where there was some action. But there was a second mistake. We argued that governments shouldn’t buy doses but capacity, i.e. they should cover the cost of building a factory or production line in return for an option on doses from that line. The problem with buying doses is that if you buy without a timeline then the company takes all orders and pushes the low-priced orders to the back of the queue. If you demand a timeline, however, that puts a lot of risk on the firms, since not everything is under their control, and that’s expensive and difficult to contract for and monitor. Thus, we advocated for push funding to de-risk capacity construction for the firms. Capacity construction is well understood–double this line–and thus much easier to contract for and monitor. (Contracting on capacity is also cheaper than a traditional AMC for reasons explained here and also in my discussion with Tyler here.) The nice thing about buying capacity is that it changes the dynamic from one where countries are scrambling to buy before others do to one where early purchases increase capacity that is later available for everyone. OWS, to its credit, did fund capacity construction for Moderna but we wanted more and other governments didn’t step up to the plate.
OWS has been a success. In combination with investments from other governments and organizations like CEPI it will save trillions of dollars and many lives. It could have been better but the main takeaway is that the case for going big is still strong. We have solved the scientific problem of making the vaccine but step two is getting billions of doses in arms. If we can increase capacity enough to vaccinate millions more people next year than currently planned that would still pay for itself many times over. Increasing capacity is not impossible. China is increasing capacity for its vaccines. It will be harder to increase capacity for mRNA vaccines since the technology is new and bespoke but it can be done. We need a second Operation Warp Speed, OWS: Delivery and Distribution.
As Tyler said yesterday, Williams wants a cow! We want billions of vaccine doses quickly. It can be done, it should be done.
Doses of the coronavirus vaccine developed by AstraZeneca and the University of Oxford could be available for purchase in India as soon as March, according to one manufacturer, in the first sign that the sought-after jab will make its way on to the private market.
Serum Institute of India, the world’s largest vaccine manufacturer, has a licence to produce the shot and has already manufactured 40m doses. Once the job is approved for use, Serum will initially supply the Indian government but then expects to sell 20m-30m doses to private facilities, according to Adar Poonawalla, chief executive.
“Everybody’s asking ‘When can I access the vaccine?’ I’ve told those guys it’s probably going to be March or April,” Mr Poonawalla told the Financial Times.
…the future availability of vaccines for sale privately in other countries, such as India, increases the likelihood of a secondary market developing for vaccines where locals or foreign visitors could pay for a vaccination if not eligible to be inoculated under their own government’s scheme.
Here is the full FT article, via J., the price is expected to be around eight dollars.
Previous research has isolated the effect of “congressional dominance” in explaining bureaucracy-related outcomes. This analysis extends the concept of congressional dominance to the allocation of H1N1, or swine flu, vaccine doses. States with Democratic United States Representatives on the relevant House oversight committee received roughly 60,000 additional doses per legislator during the initial allocation period, though this political advantage dissipated after the first 3 weeks of vaccine distribution. As a result political factors played a role in determining vaccine allocation only when the vaccine was in particularly short supply. At-risk groups identified by the Centers for Disease Control (CDC), such as younger age groups and first responders, do not receive more vaccine doses, and in fact receive slightly fewer units of vaccine.
That is from an Economic Inquiry paper by Matt E. Ryan. Via Henry Thompson.