Seasonal Infectious Disease Alerts: Vibrio vulnificus, Measles, H5N1, and Updated Flu Vaccines

Vibrio vulnificus season underway – flesh-eating bacteria, 1-in-5 mortality, rapid progression. 2026 case data from Gulf Coast states. H5N1 detected in South Dakota poultry (Beadle and Brule counties) – no human cases, advisory for clinicians. Florida COVID summer surge with vaccination guidance. Measles surge (2,500 cases) under vaccine policy highlight. Updated flu vaccines for 2026-27 season – targets H3N2 subclade K, new mRNA option for over 50, CDC recommends by late October. Timely public health education needed.