Beautiful Virgin Islands

Tuesday, Jun 24, 2025

Covid boosters wane after 4 months but protects against hospitalisation- CDC

Covid boosters wane after 4 months but protects against hospitalisation- CDC

Booster shots of the Pfizer-BioNTech and Moderna vaccines lose substantial effectiveness after about four months — but still provided significant protection in keeping people out of the hospital during the omicron surge, according to a study published Friday by the Centers for Disease Control and Prevention.
Researchers found the booster shots remained highly effective against moderate and severe covid-19 for about two months after a third dose. But their effectiveness declined substantially after four months, suggesting the need for additional boosters, the study said.

The vaccine was 91 percent effective in preventing a vaccinated person from being hospitalized during the two months after a booster shot, the study found. But after four months, protection fell to 78 percent.

Protection faded more in preventing trips to urgent care and emergency departments, falling from 87 percent in the first two months to 66 percent after four months. After more than five months, vaccine effectiveness fell to roughly 31 percent, but researchers noted that estimate was “imprecise because few data were available” for that group of people.

Protection from the two-dose vaccine regimen has declined since omicron became dominant, but a third dose revs the immune system back up to robust levels to prevent moderately severe and severe disease, an earlier CDC study found.

But how long that third shot’s protection lasts is a critical question facing public health officials because many people received their third dose months ago. Waning immunity after a third shot of mRNA vaccine during omicron has been observed in Israel and in preliminary reports from CDC, the study said. But Friday’s report represents the first real-world data in the United States of the durability of that protection during delta and omicron.

During a White House covid-19 briefing Wednesday, Anthony S. Fauci, President Biden’s chief medical adviser on the pandemic response, said officials will base booster decisions on real-world “efficacy in preventing, for example, hospital visits, as well as hospitalizations.”

“I think you should be appreciative of the fact that when you’re talking about any decisions that will be made — and I’m not anticipating any of that now — but that has to be put into the context of whom you’re talking about,” he said.

“There may be the need for yet again another boost — in this case, a fourth-dose boost for an individual receiving the mRNA — that could be based on age, as well as underlying conditions,” Fauci said.

Waning protection after a third vaccine dose “reinforces the importance of further consideration of additional doses to sustain or improve protection against COVID-19-associated” visits to emergency departments and urgent care and hospitalizations, the study said.

In a statement, CDC said boosters are “safe and effective” and the study shows that a third dose of mRNA vaccine “continues to offer high levels of protection against severe disease, even months after administration, underscoring the importance of staying up to date when eligible after receiving a primary series.”

Since September, federal health officials have urged people to get the third shots. CDC recommends booster shots for everyone 12 years and older, five months after getting two doses of the mRNA vaccines made by Pfizer-BioNTech and Moderna, or two months after a single dose of the Johnson & Johnson vaccine.

About 91 million Americans have received boosters. Nearly 8 million had gotten their boosters at least four months ago, according to CDC data. Most of the people eligible for boosters have not received them, according to CDC calculations. That includes more than one-third of the most vulnerable people age 65 and older who have received a full dose of regular vaccines but have not received a booster.

Vermont, Minnesota, Wisconsin and Maine have vaccinated the largest share of people who had already been vaccinated. The lowest rates for booster doses are in Alabama, Georgia, Texas, Mississippi and the District.

The CDC study looked at hospitalizations and emergency room and urgent care center visits in 10 states, from August to Jan. 22, 2022, covering periods when delta and omicron were dominant. In the study, about 10 percent of people were boosted and over 50 percent of people hospitalized were over 65 years old.

But the report did not evaluate the variations in waning immunity by age, underlying health conditions, or a person’s immunocompromised status.

Experts said the findings were not unexpected since studies have already shown vaccine effectiveness declines after two doses.
Newsletter

Related Articles

Beautiful Virgin Islands
0:00
0:00
Close
Germany and Italy Under Pressure to Repatriate $245bn of Gold from US Vaults
Airlines Evaluate Flight Cancellations Amid Escalating US-Iran Tensions
Starmer Invites Innovators to Join Government Talent Scheme
UK Economy’s Strong Opening Quarter Shows Signs of Cooling
Harrods Seeks Court Order to Secure Al Fayed Estate for Victims
BA and Singapore Airlines Cancel Dubai Flights Amid Middle East Tensions
Trump Faces Backlash from MAGA Base Over Iran Strikes
Meta Bets $14 B on Alexandr Wang to Drive AI Ambitions
WATCH: Israeli forces show the aftermath of a massive airstrike at Iran's Isfahan nuclear site
FedEx Founder Fred Smith, ‘Heart and Soul’ of the Company, Dies at 80
Chinese Factories Shift Away from U.S. Amid Trump‑Era Tariffs
Pimco Seizes Opportunity in Japan’s Dislocated Bond Market
Labubu Doll Drives Pop Mart to Status as China’s Most Valuable Toy Maker
Global Coal Demand Defies Paris Accord Goals
We have new information and breaking details to share about what is shaping up to be a historic air campaign tonight
Six Massive Bombs Dropped on Fordow; Trump: 'A Historic Moment for the U.S., Israel, and the World'
Fordow: Deeply Buried Iranian Enrichment Site in U.S.–Israel Crosshairs
United States Conducts Precision Strikes on Iran’s Nuclear Sites
US strikes Iran nuclear sites, Trump says
Pakistan to nominate Trump for Nobel Peace Prize.
BBC Demands Perplexity AI Immediately Stop Using Its Content
Telegram Founder: I Will Leave My Fortune to Over 100 of My Children
Political Turmoil Resurfaces in Belgium Amid Economic Concerns
Fed policymakers divided on timing of interest rate cuts
Trump signals imminent agreement with Harvard University
Inheritance tax referendum alarms Swiss billionaire community
Japan cancels bilateral security meeting amid US defence demands
AI skeptic Emily Bender warns that ‘the emperor has no clothes’
Israel Confirms Assassination of Quds Force Commander in Tehran
16 Billion Login Credentials Leaked in Unprecedented Cybersecurity Breach
Senate hearing on who was 'really running' Biden White House kicks off
Iranian Military Officers Reportedly Seek Contact with Reza Pahlavi, Signal Intent to Defect
FBI and Senate Investigate Allegations of Chinese Plot to Influence the 2020 Election in Biden’s Favor Using Fake U.S. Driver’s Licenses
Vietnam Emerges as Luxury Yacht Destination for Ultra‑Rich
Plans to Sell Dutch Embassy in Bangkok Face Local Opposition
China's Iranian Oil Imports Face Disruption Amid Escalating Middle East Tensions
Trump's $5 Million 'Trump Card' Visa Program Draws Nearly 70,000 Applicants
DGCA Finds No Major Safety Concerns in Air India's Boeing 787 Fleet
Airlines Reroute Flights Amid Expanding Middle East Conflict Zones
Elon Musk's xAI Seeks $9.3 Billion in Funding Amid AI Expansion
Trump Demands Iran's Unconditional Surrender Amid Escalating Conflict
Israeli Airstrike Targets Iranian State TV in Central Tehran
President Trump is leaving the G7 summit early and has ordered the National Security Council to the Situation Room
Taiwan Imposes Export Ban on Chips to Huawei and SMIC
Israel has just announced plans to strike Tehran again, and in response, Trump has urged people to evacuate
Netanyahu Signals Potential Regime Change in Iran
Juncker Criticizes EU Inaction on Trump Tariffs
EU Proposes Ban on New Russian Gas Contracts
Analysts Warn Iran May Resort to Unconventional Warfare
Iranian Regime Faces Existential Threat Amid Conflict
×