What FDA’s fall 2026 COVID-19 vaccine formula update (JN.1 XFG) means
FDA advised that the U.S. 2026–2027 seasonal COVID-19 vaccine should use a monovalent JN.1-lineage XFG target for use beginning in fall 2026. Here’s what a “formula update” changes, how families can think about timing with CDC guidance, who should be especially deliberate, and what Medicare beneficiaries may want to check for access.
