Big gap between Pfizer, Moderna vaccines seen for preventing COVID hospitalizations


Yahoo News 17 September, 2021 - 11:38pm 57 views

Data collected from 18 states between March and August suggest the Pfizer-BioNTech vaccine reduces the risk of being hospitalized with COVID-19 by 91% in the first four months after receiving the second dose. Beyond 120 days, however, that vaccine efficacy drops to 77%.

Meanwhile, Moderna's vaccine was 93% effective at reducing the short-term risk of COVID-19 hospitalization and remained 92% effective after 120 days.

Overall, 54% of fully vaccinated Americans have been immunized with the Pfizer shot.

The surprising findings came as a Food and Drug Administration advisory panel recommended against offering booster doses of the Pfizer vaccine to all Americans ages 16 and older. In a striking rebuke, 16 of 18 experts told the agency it had not mustered enough data to make a third shot the norm.

In lengthy briefings to the panel, representatives from Pfizer pointed to clinical trial results involving 306 mostly healthy participants to argue that a booster "restores" the 95% vaccine effectiveness rate seen earlier in the pandemic.

Company officials also touted evidence from Israel, which rolled out boosters after seeing a rise in hospitalizations among people who were fully vaccinated. Those hospitalizations dropped dramatically after third doses were given, Israeli scientists have said.

But panel members made clear that despite Pfizer's aggressive stance, it had not gathered enough evidence that a third shot was safe for young people and for those at lesser risk of becoming severely ill with COVID-19.

"We need age-specific data" on the safety and protective benefits of a further booster, said Dr. Ofer Levy, a panel member who directs the Precision Vaccines program at Boston Children's Hospital.

FDA clearance for booster shots for everyone 16 and older would be seen as something "close to a mandate," said Dr. Eric Rubin, a panel member and infectious-disease expert at the Harvard T.H. Chan School of Public Health. Rubin worried that such a move could redefine what it takes to be considered fully vaccinated against COVID-19.

"None of us are there yet," he said.

But others apparently are. Dr. Anthony Fauci, President Biden's top advisor on vaccines, has come out strongly in favor of booster shots, saying before Friday's vote that a failure to endorse the shots "would be a mistake."

And in mid-August, Biden himself said his administration would begin making booster shots available the week of Sept. 20 to those vaccinated for at least eight months.

Biden cautioned at the time that his plan was contingent on FDA approval. But his announcement stoked concerns of political meddling in a matter that required the unhindered evaluation of scientists.

"This should demonstrate to the public that the members of this committee are independent of the FDA," Dr. Archana Chatterjee, dean of the Chicago Medical School, said after the vote. "In fact, we do bring our voices to the table when we are asked to serve on this committee.”

The panel unanimously agreed that a third shot of the vaccine now sold under the brand name Comirnaty should be offered to select groups: individuals 65 and older, people at risk of developing severe disease, and those, including healthcare workers, whose occupations put them at high risk of infection.

Dr. Peter Marks, who leads the FDA's evaluation of drugs and vaccines, told panel members that the agency could give its blessing to booster shots with an emergency use authorization — a regulatory step that falls short of the full approval Pfizer had sought.

The company issued no statement Friday in response to the panel's vote.

Researchers in the United States have been warning for months that the immunity afforded by COVID-19 vaccines might be waning. The CDC reported that in late July, close to three-quarters of the 469 people swept up in a Massachusetts outbreak were fully vaccinated. And the agency has launched several studies aimed at detecting changes in vaccine effectiveness in healthcare workers and others who were vaccinated early.

But virtually all of those infections appeared to be mild. And health officials eager to induce vaccine skeptics to step up for their shot — including Fauci and Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention — have repeatedly praised the vaccines for keeping most fully vaccinated people out of hospitals.

The new report on waning vaccine efficacy challenges that expectation.

Researchers from around the country found striking differences between two mRNA vaccines long thought to be interchangeable.

When the Moderna vaccine received emergency use authorization in December, the company reported that 30 people in its clinical trial developed severe cases of COVID-19, including nine who required hospitalization. All 30 patients were in the placebo group, resulting in a vaccine efficacy against severe disease of 100%.

Ten people in Pfizer's initial clinical trial developed severe cases of COVID-19. Nine of them were in the placebo group, including seven who were hospitalized, resulting in a vaccine efficacy against severe disease of 88.9%.

Once the Moderna and Pfizer vaccines were rolled out to the public, their records of preventing COVID-19 hospitalizations in the first four months were neck and neck — 93% and 91% effective, respectively. But the degree of protection diverged after that.

When they focused specifically on the period 120 days beyond the second dose, the study authors found that the Moderna vaccine remained 92% effective at preventing COVID-19 hospitalizations. But the equivalent figure for the Pfizer vaccine was 77%.

The results were published in the CDC's Morbidity and Mortality Weekly Report.

Both the Pfizer and Moderna vaccines are based on mRNA technology, which delivers temporary instructions to the body’s muscle cells that help it learn to recognize the spike protein, a key part of the coronavirus’ structure. But “they're actually not necessarily interchangeable,” said Dr. Timothy Brewer, a professor of medicine and epidemiology at UCLA.

Each vaccine is formulated and administered differently, Brewer said, and those differences could affect the strength and duration of the two vaccines' protection.

Moderna’s shot contains 100 micrograms of vaccine, more than three times the 30 micrograms in the Pfizer shot. And Pfizer’s two doses are given three weeks apart, while Moderna’s two-shot regimen is administered with a four-week gap.

Brewer also pointed to evidence that the Moderna vaccine seemed to elicit higher levels of a key antibody than the Pfizer vaccine.

“We know from other studies the neutralizing antibody levels will decay over time, so starting at a higher level will mean that you have farther to go before you decay to a point where efficacy drops off,” he said.

Dr. Robert Murphy, who directs Northwestern University's Institute for Global Health, said the Pfizer vaccine's reduced protection against severe disease may bolster the case for boosters for all who got the vaccine, not just the specific groups identified by the FDA advisory panel.

“Based on the data I have seen, persons who received the Pfizer vaccine would benefit from a booster dose at this time,” he said. "I don’t see why we have to wait until the younger people get sick and become hospitalized.”

But Dr. Arnold Monto, who chairs the FDA advisory panel, applauded the agency's willingness to withhold a full-throated call for boosters until a stronger case can be made. And he suggested that as more evidence accumulates, boosters for all might still get the nod.

"That’s the beauty of the emergency use authorization," said Monto, an epidemiologist at University of Michigan. "It can be changed based on changing data.”

This story originally appeared in Los Angeles Times.

The United States has administered 383,994,877 doses of COVID-19 vaccines in the country as of Friday morning and distributed 464,315,725 doses, the U.S. Centers for Disease Control and Prevention said. Those figures are up from the 383,038,403 vaccine doses the CDC said had gone into arms by Sept. 16 out of 462,384,885 doses delivered. The CDC tally includes two-dose vaccines from Moderna and Pfizer/BioNTech, as well as Johnson & Johnson's one-shot vaccine.

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Moderna says the data provides evidence boosters could stop thousands of cases - but most "breakthrough" infections after its shot weren't severe.

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Overall healthy adults with the Moderna COVID vaccine had 93% vaccine effectiveness against hospitalization over five months compared to those with 88% protection with Pfizer and 71% from the Johnson & Johnson vaccine, a new report out Friday from the CDC shows. Why it matters: The report comes as the Food and Drug Administrations meets Friday to consider whether to endorse a contentious plan for booster shots among the fully vaccinated. Get market news worthy of your time with Axios Markets. Su

Protection from Pfizer and Moderna's COVID-19 vaccines wanes over time, but not all experts think it's time for boosters yet.

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Read full article at Yahoo News

Mississippi says Covid-19 deaths in pregnant women are rising -- and it's pleading with them to get vaccinated

KTVB 18 September, 2021 - 04:10am

Updated 8:44 PM ET, Fri September 17, 2021

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CNN's Jacqueline Howard contributed to this report.

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People with chronic conditions among most at risk from Covid even after jabs

The Guardian 18 September, 2021 - 12:00am

The study, based on data from more than 6.9 million vaccinated adults, 5.2 million of whom had received both doses, found that being vaccinated offers powerful protection against hospitalisation for almost all groups. However, a risk calculator based on the data shows that some groups remain at particular risk and may benefit from booster vaccine doses and treatments such as monoclonal antibodies.

Carol Coupland, professor of medical statistics in primary care at the University of Nottingham and senior researcher at the University of Oxford, said: “Overall the risks are much smaller than before vaccination, but it hasn’t completely removed the differences between these groups.”

Aziz Sheikh, professor of primary care research and development and director of the Usher Institute at the University of Edinburgh, said that for some groups the increased risk was due to increased exposure to Covid-19, but that it was possible those with Down’s syndrome had an additional underlying vulnerability. “People need to look into this group as it remains a pretty major risk group,” he said.

The study found that older members of the population and men are at greater risk as well as those from Indian and Pakistani backgrounds. Also at greater risk are those from a deprived background, the immunosuppressed and residents in a care home.

The findings, published in the British Medical Journal, will be used in an updated version of an NHS risk prediction tool, currently used by GPs to calculate patients’ risk during consultations. The scientists, led by a team at the University of Oxford, will also make the tool available online for academics, but say this version will not be accompanied by clinical guidance.

The new algorithm predicts those most at risk of serious Covid-19 outcomes from 14 or more days after second vaccination dose, when substantial immunity is expected to have developed.

Researchers hope the new tool will allow those who perceive risk to be high to make more informed decisions regarding shielding and potentially inform policy and clinical decisions on booster vaccine doses and monoclonal antibodies.

The scientists used national datasets from general practice, vaccination, PCR testing, death registries and hospital admissions data. This sample included 2,031 Covid-19 deaths and 1,929 Covid-19 related hospital admissions, of which 81 deaths and 71 admissions occurred 14 or more days after the second vaccine dose. Based on this, the researchers developed scores to calculate people’s risk of hospital admission or death from Covid-19 after one, or two vaccination doses.

The study did not take into account factors that could have affected exposure to Covid-19, such as occupation and the number of people sharing a home.

Prof Hippisley-Cox said: “Individual risk will always depend on individual choices as well as the current prevalence of the disease, however we hope that this new tool will help shared decision making and more personalised risk assessment.”

Commentary: Why bother to get vaccinated?

Los Angeles Times 17 September, 2021 - 04:05pm

In California, by order of the Department of Public Health, all indoor events with more than 1,000 attendees must require proof of vaccination or a negative COVID test. Without a vaccine it is harder to travel internationally, with dwindling options for the unvaccinated. And schools are beginning to implement vaccination requirements — all L.A. Unified School District students 12 and older must be fully vaccinated by January. This action will help keep our schools open, with students and teachers in the classroom.

In addition to preventing the risk of severe illness, including hospitalization and death, vaccines also prevent the long-lasting problems related to COVID-19. Many formerly infected COVID-19 patients report lingering fatigue, intermittent fever, shortness of breath, cough, joint pain, muscle pain, headache, chest pain, a “brain fog” which includes difficulty thinking and concentrating, and depression. In addition, many recovered COVID-19 patients report health issues with their heart, lung, kidney, skin, teeth and nervous system after infection with the coronavirus.

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If you are pregnant or considering becoming pregnant, it is especially crucial that you receive the vaccine. COVID-19 illness can be more severe in pregnancy. On the bright side, COVID-19 vaccines are safe for pregnant women and recommended by the CDC for all women who are pregnant, considering becoming pregnant or breastfeeding. Importantly, the vaccine protects unborn children by allowing mothers to pass along immunity to the SARS-CoV-2 virus.

By getting the vaccine, you are also protecting the most vulnerable including those whose immune systems are not strong enough to battle COVID-19. This means if you come into contact with an unvaccinated child battling cancer, you are much less likely to expose them to a virus they just can’t fight.

With a highly contagious disease, our actions affect those around us. We must encourage everyone to be fully vaccinated to protect ourselves, our friends, our loved ones and our society.

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