\n U.S. health regulators informed senior executives at Merck, Sanofi and AstraZeneca last week that their approved protective RSV treatments for infants would face fresh safety scrutiny following concerns raised by vaccine skeptics, multiple sources familiar with the situation told Reuters.\n <\/p>\n
\n The preventive therapies – Beyfortus from Sanofi (SASY.PA), opens new tab<\/a> and AstraZeneca (AZN.L), opens new tab<\/a> and Enflonsia from Merck (MRK.N), opens new tab<\/a> – would be the latest called into question under U.S. Health Secretary Robert F. Kennedy Jr., a long-time promoter of anti-vaccine views who is presiding over a review of routine childhood immunizations.\n <\/p>\n \n Kennedy maintains the potential risks of many pharmaceutical products have not been properly studied. Leading medical societies and many state health officials say Kennedy is trying to dismantle a vaccine program that prevents disease and saves lives based on his beliefs rather than scientific evidence.\n <\/p>\n \n FDA officials appointed under Kennedy began making inquiries into the respiratory syncytial virus therapies over the summer, according to sources and internal documents.\n <\/p>\n \n Senior FDA adviser Tracy Beth Hoeg initiated safety questions at the agency as early as June, Health and Human Services Department spokesman Andrew Nixon told Reuters. Nixon did not say what prompted the RSV review.\n <\/p>\n \n Hoeg had opposed U.S. health policies during the COVID-19 pandemic and has questioned use of some childhood vaccines.\n <\/p>\n \n Maryanne Demasi, an independent journalist based in Australia who has been critical of COVID vaccines, wrote in an August 17 blog post that the RSV therapies could increase the risk of seizures.\n <\/p>\n \n Several safety studies have found no such evidence of seizure risk.\n <\/p>\n \n George Tidmarsh, at the time director of the FDA division that oversees the RSV therapies, directed staff in late August to compile information about Enflonsia for a second look at approval of the therapy earlier this year, internal documents reviewed by Reuters show. Beyfortus has been on the U.S. market since July 2023.\n <\/p>\n \n Hoeg\u2019s questions within FDA led officials at the agency\u2019s Center for Drug Evaluation and Research to convene a call with the three drug companies last Wednesday to tell them to expect further safety questions from the commissioner\u2019s office, sources familiar with the situation said.\n <\/p>\n \n The call was brief, and did not spell out what data might be requested, they said. Hoeg has since been named the acting director of CDER.\n <\/p>\n \n It is unclear whether the FDA will take any actions to change the product label or restrict availability of the therapies. The call with company executives underscored the seriousness of the inquiry, the sources said.\n <\/p>\n \n \u201cFDA routinely evaluates emerging safety information and will update product labeling if warranted by the totality of the evidence,\u201d Nixon said in a statement.\n <\/p>\n \n The agency is \u201crigorously reviewing the available data, as it does for all products, to ensure decisions remain rooted in evidence-based science and in the best interest of patients,\u201d he said.\n <\/p>\n \n In a statement Sanofi said the safety and effectiveness of Beyfortus has been demonstrated in over 50 studies involving more than 400,000 infants. Merck confirmed the meeting with FDA representatives and welcomed continued scientific dialogue with the agency, other regulators and advisory committees, adding it is confident in Enflonsia\u2019s safety.\n <\/p>\n \n Two or three out of every 100 infants under 6 months old are hospitalized with RSV annually, according to federal estimates. For babies at high risk, RSV infection can lead to severe breathing problems and pneumonia and may become life-threatening.\n <\/p>\n \n Unlike vaccines, these RSV therapies do not stimulate the immune system to create antibodies. Instead, they provide infants with ready-made antibodies to protect against illness in their first six months to over one year of life.\n <\/p>\n \n Beyfortus generated combined global sales of more than $2.6 billion in 2024. Merck\u2019s newer Enflonsia is expected to make $250 million in sales next year.\n <\/p>\n \n The therapies are included in the U.S. Centers for Disease Control and Prevention\u2019s recommended childhood immunization schedule.\n <\/p>\n \n A CDC study of real-world data on Beyfortus and a maternal vaccine showed up to a 43% reduction in RSV hospitalizations for infants during the 2024-25 respiratory illness season, compared to the 2018-2020 periods.\n <\/p>\n \n Demasi criticized the CDC\u2019s analysis of Beyfortus for considering newborns separately from slightly older babies, arguing in her post that with data on both groups combined, there appeared to be a statistically significant risk of seizure.\n <\/p>\n \n Some scientists have pushed back against the critique. Jake Scott, an infectious-disease physician and Stanford University associate professor, wrote in August that older babies receive multiple vaccines at the same time as the RSV therapy, while newborns typically do not. Analyzing the age groups separately prevents mis-attributing seizures from other vaccines to the antibody, he wrote.\n <\/p>\n \n \u201cRolling back RSV availability based on baseless concerns would do harm to American children,\u201d Scott wrote on Quillette, an online publication. \u201cPerhaps more importantly, it would set a dangerous precedent in regard to how America\u2019s scientific advisory-committee system might be undermined \u2014 or even co-opted\u2014 by peddlers of junk science.\u201d\n <\/p>\n \n Three days after Demasi\u2019s post, Dr. Robert Malone, a member of the national vaccine advisory board appointed by Kennedy, said he regretted recommending widespread use of Enflonsia at a June meeting of the committee based on CDC staff analysis.\n <\/p>\n \n \u201cI voted in favor of the resolution based on the information and logic presented,\u201d Malone wrote on Substack. \u201cThat trust in the data presented now appears to have been ill-advised.\u201d\n <\/p>\n \n Malone and other vaccine advisers on Friday scrapped a long-standing recommendation<\/a> that all American newborns receive the hepatitis B shot, the most consequential change to date in Kennedy\u2019s remaking of U.S. vaccine policy<\/a>.\n <\/p>\n \n At that same meeting, Hoeg cited data from four late-stage clinical trials involving both RSV therapies that she said showed an \u201cunfavorable imbalance\u201d in mortality, with more deaths in the treatment arm.\n <\/p>\n \n While not statistically significant, meaning the finding could be due to chance, Hoeg said the issue \u201ccould be revisited\u201d by the committee.\n <\/p>\n","protected":false},"excerpt":{"rendered":"U.S. health regulators informed senior executives at Merck, Sanofi and AstraZeneca last week that their approved protective RSV…\n","protected":false},"author":2,"featured_media":335838,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[49,48,84,392],"class_list":{"0":"post-335837","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-healthcare","8":"tag-ca","9":"tag-canada","10":"tag-health","11":"tag-healthcare"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/335837","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/comments?post=335837"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/335837\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media\/335838"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media?parent=335837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/categories?post=335837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/tags?post=335837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}