Caitlin Rivers, PhD, MPH is a writer and epidemiologist. She directs the Center for Outbreak Response Innovation at Johns Hopkins and translates complex science into practical guidance.
Flu B still active in the Northeast; RSV activity high but declining.
Outbreak alerts that matter
The Food and Drug Administration approved the 2025-2026 formulation of the annual Covid-19 booster today. As expected, the label limits approval to people over the age of 65 and younger
Note: I would normally also share wastewater concentration data, but it was not updated this week. Influenza-like illness Covid-19 RSV
While writing about gun violence recently, I was reminded of a prominent violence prevention program in Baltimore with public health roots. Safe Streets is based on a program developed by
💡Looking for my 2025-2026 vaccine guide? Find it on Substack here. This page answers follow-up questions from readers. Can doctors still prescribe the Covid-19 vaccine "off-label" to other
