ACIP Recommends Use of Merck’s ENFLONSIA™ (clesrovimab-cfor) for Prevention of Respiratory Syncytial Virus (RSV) Lower Respiratory Tract Disease in Infants Younger than 8 Months of Age Born During or Entering Their First RSV Season

RAHWAY, N.J.--(BUSINESS WIRE)--Jun 26, 2025--

Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced the U.S. Centers for Disease Control and Prevention (CDC) Advisory Committee on Immunization Practices (ACIP) voted to recommend ENFLONSIA™ (clesrovimab-cfor) as an option for the prevention of respiratory syncytial virus (RSV) lower respiratory tract disease in infants younger than 8 months of age who are born during or entering their first RSV season. The ACIP also voted to include ENFLONSIA in the Vaccines for Children Program—an important step in ensuring broad access to this preventive option for infants.

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ENFLONSIA is a preventive, long-acting monoclonal antibody (mAb) designed to provide direct, rapid and durable protection through 5 months, a typical RSV season, with the same dose regardless of weight. A typical RSV season usually spans autumn to spring of the next year.

ENFLONSIA should not be administered to infants with a history of serious hypersensitivity reactions, including anaphylaxis, to any component of ENFLONSIA. See additional Selected Safety Information below.

“Ahead of the 2025-2026 RSV season, we are proud to offer ENFLONSIA as a new preventive option designed to protect healthy and at-risk infants from RSV disease across a spectrum of severity, including worsening disease requiring hospitalization,” said Dr. Richard M. Haupt, vice president, head of global medical & scientific affairs, vaccines and infectious diseases, Merck Research Laboratories. “The Committee’s recommendation is an important step forward in efforts to help reduce the significant burden RSV continues to place on infants, families and health care systems.”

The U.S. Food and Drug Administration (FDA) approved ENFLONSIA earlier this month based on clinical data from the Phase 2b/3 CLEVER and Phase 3 SMART trials. Merck plans to make ENFLONSIA available for ordering by physicians and health care administrators in July 2025, with shipments to be delivered before the start of the 2025-2026 RSV season.

The ACIP’s recommendation for ENFLONSIA is provisional and will be official once reviewed and finalized by the CDC Director or the Health and Human Services Secretary (in the absence of a CDC Director).

About ENFLONSIA™ (clesrovimab-cfor)

ENFLONSIA is Merck’s extended half-life monoclonal antibody (mAb) indicated for passive immunization for the prevention of respiratory syncytial virus (RSV) lower respiratory tract disease in newborns and infants who are born during or entering their first RSV season. ENFLONSIA is administered using the same dose regardless of weight (105 mg/0.7 mL in a prefilled syringe) and is designed to provide direct, rapid and durable protection through 5 months, a typical RSV season. For infants born during the RSV season, ENFLONSIA is to be administered within the first week of life. For infants born outside of the RSV season, ENFLONSIA should be administered shortly before the RSV season begins. For infants undergoing cardiac surgery with cardiopulmonary bypass during or entering their first RSV season, an additional 105 mg dose is recommended as soon as the infant is stable after surgery. ENFLONSIA has a 30-month shelf life.

Selected Safety Information for ENFLONSIA™ (clesrovimab-cfor)

Do not administer ENFLONSIA to infants with a history of serious hypersensitivity reactions, including anaphylaxis, to any component of ENFLONSIA.

Serious hypersensitivity reactions, including anaphylaxis, have been observed with other human immunoglobulin G1 (IgG1) monoclonal antibodies. If signs or symptoms of a clinically significant hypersensitivity reaction or anaphylaxis occur, initiate appropriate medications and/or supportive therapy.

The most common adverse reactions were injection-site erythema (3.8%), injection-site swelling (2.7%) and rash (2.3%).

AboutRSV

Respiratory syncytial virus (RSV) is a contagious virus that causes widespread seasonal infections and can lead to serious respiratory conditions such as bronchiolitis and pneumonia. According to the CDC, two to three out of every 100 infants under 6 months of age are hospitalized with RSV annually. As the leading cause of hospitalization among infants in the U.S., there is persisting unmet need for RSV preventive options for both healthy and high-risk infants born during or entering their first RSV season. RSV season is the time of year when RSV infections are most common, usually occurring fall/autumn through spring of the next year. RSV typically peaks in the winter in most regions of the United States, but timing and severity in a given community or region can vary year to year.

About Merck

At Merck, known as MSD outside of the United States and Canada, we are unified around our purpose: We use the power of leading-edge science to save and improve lives around the world. For more than 130 years, we have brought hope to humanity through the development of important medicines and vaccines. We aspire to be the premier research-intensive biopharmaceutical company in the world – and today, we are at the forefront of research to deliver innovative health solutions that advance the prevention and treatment of diseases in people and animals. We foster a diverse and inclusive global workforce and operate responsibly every day to enable a safe, sustainable and healthy future for all people and communities. For more information, visit www.merck.com and connect with us on X (formerly Twitter), Facebook, Instagram, YouTube and LinkedIn.

Forward-Looking Statement of Merck & Co., Inc., Rahway, N.J., USA

This news release of Merck & Co., Inc., Rahway, N.J., USA (the “company”) includes “forward-looking statements” within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. These statements are based upon the current beliefs and expectations of the company’s management and are subject to significant risks and uncertainties. There can be no guarantees with respect to pipeline candidates that the candidates will receive the necessary regulatory approvals or that they will prove to be commercially successful. If underlying assumptions prove inaccurate or risks or uncertainties materialize, actual results may differ materially from those set forth in the forward-looking statements.

Risks and uncertainties include but are not limited to, general industry conditions and competition; general economic factors, including interest rate and currency exchange rate fluctuations; the impact of pharmaceutical industry regulation and health care legislation in the United States and internationally; global trends toward health care cost containment; technological advances, new products and patents attained by competitors; challenges inherent in new product development, including obtaining regulatory approval; the company’s ability to accurately predict future market conditions; manufacturing difficulties or delays; financial instability of international economies and sovereign risk; dependence on the effectiveness of the company’s patents and other protections for innovative products; and the exposure to litigation, including patent litigation, and/or regulatory actions.

The company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. Additional factors that could cause results to differ materially from those described in the forward-looking statements can be found in the company’s Annual Report on Form 10-K for the year ended December 31, 2024 and the company’s other filings with the Securities and Exchange Commission (SEC) available at the SEC’s Internet site ( www.sec.gov ).

Please see Prescribing Information for ENFLONSIA (clesrovimab-cfor) at https://www.merck.com/product/usa/pi_circulars/e/enflonsia/enflonsia_pi.pdf and Patient Information/Medication Guide for ENFLONSIA at https://www.merck.com/product/usa/pi_circulars/e/enflonsia/enflonsia_ppi.pdf.

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PHILADELPHIA (AP) — Nick Sirianni understood the risks associated with his decision to rest Jalen Hurts, Saquon Barkley and most of the Eagles' key starters with the No. 2 seed in the NFC at stake.

His backup plan backfired in the moment, and the Super Bowl champions will start their postseason defense of the title as the 3 seed.

With Hurts and Barkley on the bench and the Eagles' second-stringers failing to meet the moment, the Washington Commanders got fourth-quarter passing and rushing touchdowns from Josh Johnson and beat Philadelphia 24-17 on Sunday.

“I knew this was an outcome, that these things could happen,” said Sirianni, who has coached the Eagles to two of the last three Super Bowls. “One thing I could guarantee was giving them rest. I couldn't guarantee them anything else. Being healthy and going into the playoffs healthy is a big deal for us.”

The NFC East champion Eagles (11-6) will open the playoffs at home next weekend against San Francisco.

The final outcome of Sirianni's call won't be determined until the Eagles' postseason run is over. Perhaps a physical and mental break — essentially a bye week for the core starters — was what the Eagles needed to gear up for a Super Bowl run.

“I know there will be debate on that,” Sirianni said.

Good call.

The Eagles needed help to earn the No. 2 seed. They had to beat the Commanders and Detroit needed to win at Chicago. Sure enough, the Lions beat the Bears 19-16 to add another gut punch to the Eagles' loss.

With Jayden Daniels shut down and Marcus Mariota dealing with a leg injury, the Commanders (5-12) started Johnson, their 39-year-old third-stringer. Johnson rallied the Commanders from a 17-10 hole with a 2-yard touchdown pass to John Bates and then scored on a 1-yard run with 2:32 left.

With Hurts, Barkley, wide receiver A.J. Brown and tight end Dallas Goedert sitting out, Philadelphia couldn't rally late.

Eagles defensive end Brandon Graham, who came out of retirement in midseason to chase another Super Bowl, defended Sirianni's decision.

“It's valuable because you get an extra week to get your body together, especially if you've been dealing with some stuff,” Graham said. “Now it don't matter. We've got to try and go win every game. First one at home, take care of business and on to the next.”

The Eagles had to watch and root — for the Lions, too — like everyone else.

Eagles fans cheered when each Detroit score against Chicago was shown on the videoboard. Sirianni said during the week he also would be scoreboard-watching, though he kept the cheering to his team’s own plays, such as Tanner McKee’s 15-yard TD pass to Grant Calcaterra for a 7-0 lead in the second quarter.

The Commanders, also playing backups in a forgettable season a year after they faced the Eagles in the NFC championship game, refused to roll over and twisted the stomachs of Eagles fans into knots — and got them ready to light up talk radio this week.

“I didn't really think too much about the negatives of it,” Sirianni said.

McKee had been impressive in limited action as Hurts’ backup over the last two seasons but did little to improve his stock in the finale.

He was 21 of 40 for 241 yards with an interception and was sacked on the final drive to end the Eagles' shot at the 2 seed and the possibility of two home playoff games that would come with it.

Jake Moody sent Washington into halftime with a 10-7 lead on a 56-yard field goal.

The Eagles pounced on a fumble in the third quarter and Tank Bigbsy, the sure-handed backup to Barkley, scored for a 14-10 lead. Jake Elliott kicked a 39-yarder for a 17-10 lead.

The Eagles' chances were upended when Kelee Ringo — yes, a backup — was flagged for pass interference to set up Johnson's go-ahead rushing TD.

“I know to the rest of the world, this might not mean nothing,” Johnson said.

In Philly, the game sure meant something — and the hand-wringing will only continue.

Smith was one of the Eagles regulars who earned snaps, and he topped 1,000 yards receiving for the third time in his career.

Smith entered the game 44 yards shy and exceeded 1,000 yards before the end of the first quarter. He had three catches for 52 yards — including a 27-yarder on his final reception that gave him a team-high 1,008 yards.

Smith was immediately pulled from the game.

“We were safe with him as far as what kind of routes we were running and what he was doing,” Sirianni said.

Brown didn't need to play because he already had 1,003 yards.

Eagles: Calcaterra left with an ankle/knee injury. Offensive lineman Brandon Toth was evaluated for a concussion.

The Commanders are set to have a top-10 pick in the NFL draft.

The Eagles could play two road games — including a divisional-round game at Chicago — if they want to return to the Super Bowl. The Eagles were 3 1/2-point favorites to beat the 49ers, according to BetMGM Sportsbook.

AP NFL: https://apnews.com/hub/nfl

Philadelphia Eagles place kicker Jake Elliott (4) celebrates with teammates after scoring a field goal during the second half of an NFL football game against the Washington Commanders on Sunday, Jan. 4, 2026, in Philadelphia. (AP Photo/Matt Slocum)

Washington Commanders quarterback Josh Johnson (14) is brought down by Philadelphia Eagles linebacker Jihaad Campbell (30) during the second half of an NFL football game Sunday, Jan. 4, 2026, in Philadelphia. (AP Photo/Matt Rourke)

Washington Commanders tight end John Bates (87) celebrates scoring a touchdown with teammates during the second half of an NFL football game against the Philadelphia Eagles on Sunday, Jan. 4, 2026, in Philadelphia. (AP Photo/Chris Szagola)

Washington Commanders tight end John Bates (87) scores a touchdown in front of Philadelphia Eagles linebacker Jihaad Campbell (30) during the second half of an NFL football game on Sunday, Jan. 4, 2026, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles quarterback Tanner McKee (16) looks to pass while under pressure from Washington Commanders defensive tackle Daron Payne (94) during the second half of an NFL football game Sunday, Jan. 4, 2026, in Philadelphia. (AP Photo/Chris Szagola)