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 is picking up in the West while COVID-19 slowly declines.
Start date for winter publication schedule announced
Early signs of flu increase in Pacific states
Activity for resp viruses is low, though Florida, New Jersey, and Alaska show rising flu activity and Covid-19 is still climbing in the Northeast. Plus: CDC has lost 30% of its workforce since early 2025.
Flu and Covid-19 activity are both still low nationally, with Covid-19 at or near peak in the South and West while the Midwest and Northeast tick up from very low baselines. Florida's locally acquired dengue count at 152, and a mumps outbreak among student athletes at San Diego State.
Covid-19 peaks; influenza activity low but stirring
Labor Day weekend updates on influenza, Covid-19, RSV, and norovirus.
Covid-19 activity continues to rise; vaccine now available. Also rabies at a petting zoo and measles deaths.
A guide to seasonal vaccines for people who are immunocompromised.
Covid-19 activity highest in the South and Hawaii. New post-exposure prophylaxis option for Covid-19 and new flu vaccine option come to market.
Reflecting on the fourth anniversary of Force of Infection
Covid-19 activity continues rising across the country with the South and West most heavily affected. Major recalls of iceberg lettuce, jalapenos, and shell eggs affect millions of consumers.
