Speaking at a Sept. 9 media briefing on the newly released Make America Healthy Again Strategy, U.S. Health and Human Services Secretary Robert Kennedy confirmed what could be the worst fears of many vaccine experts.

The envelope (E) proteins of Zika virus (ZIKV) and dengue virus (DENV) present a high degree of homology, which can lead to cross-reactive antibodies that exacerbate disease through antibody-dependent enhancement. This enormously challenges the development of effective ZIKV vaccines.

Sparks flew both ways Sept. 4 as Democratic senators pushed for Robert Kennedy to resign as secretary of the U.S. Department of Health and Human Services (HHS) during a Senate Finance Committee hearing ostensibly held to discuss the Trump administration’s 2026 health care agenda. But with Kennedy the only witness, the hearing focused on Kennedy’s perceived failings as HHS secretary. “The United States is in the midst of a health care calamity,” Ranking Member Ron Wyden, D-Ore., said in his opening comments, which were laden with personal attacks.

The vaccine dominoes continue to fall in the U.S. This time one fell on the FDA’s Vaccines and Related Biological Products Advisory Committee, as one of Health and Human Services Secretary Robert Kennedy’s most outspoken critics was removed from the panel nearly a year and a half before his term was to expire.

South Korea’s Ministry of Food and Drug Safety approved Moderna Inc.’s Spikevax LP.8.1 vaccine as an updated shot for COVID-19 targeting the LP.8.1 variant, according to Moderna Korea’s announcement Sept. 1. The regulatory clearance comes days after the U.S. FDA accepted, on Aug. 27, Moderna’s supplemental BLAs for two of its COVID-19 vaccines, Spikevax and Mnexspike.

Effective vaccines against Staphylococcus aureus remain out of reach: 10 candidates that showed promise in preclinical animal models have failed in clinical trials. Researchers at Third Military Medical University and collaborators reasoned that one of the reasons might be that 70%-80% of the population has developed antibodies to the pathogen.

Immunoprecise Antibodies Ltd. is advancing its universal dengue vaccine program. Following the discovery and validation of a uniquely conserved dengue epitope using its Lensai platform, the company is now advancing to preclinical manufacturing for in vivo testing and virus neutralization analysis.

French vaccines specialist Osivax SAS has been awarded $19.5 million by the U.S. Biomedical Advanced Research and Development Authority (BARDA) to fund work on its universal influenza A vaccine.

Worrisome new signals caused the U.S. FDA – which earlier this month OK’d revised labeling for Valneva SE’s chikungunya virus vaccine Ixchiq – to suspend the product’s license altogether. Regulators pointed to four added reports of serious adverse events consistent with chikungunya-like illness, and told Valneva, of Saint Herblain, France, that the company must stop U.S. shipping and sales of the product. Shares (NASDAQ:VALN) closed Aug. 25 at $9.43, down $2.21, or 19%.