After a more than 13-year period of stability with Janet Woodcock as the head of CDER, with Patrizia Cavazzoni taking charge during the next four years of former U.S. President Joe Biden’s tenure, the FDA division has had no fewer than five different people in charge throughout 2025. Up to bat now as acting director is Tracy Beth Høeg, a physician and epidemiologist who co-authored a paper in 2022 with CBER Director Vinay Prasad, FDA Commissioner Marty Makary and others demonstrating that COVID-19 boosters and college vaccine mandates were harmful to young men due to myocarditis risks.

Individual liberty and choice vs. wider public health became one predictable hinge upon which swung the often-acerbic debates at the CDC’s Advisory Committee for Immunization Practices (ACIP) meeting, which took up – again – the matter of hepatitis B virus (HBV) vaccine scheduling, a day after the panel voted not to vote on such guidance.

The first phase of the U.K. synthetic human genome project has successfully completed, realizing key steps in chromosome synthesis. The work has demonstrated a multistep method for transfecting mouse stem cells with native human chromosomes, where they are stably maintained and can be manipulated to replace native DNA with synthetic DNA. The engineered chromosomes can then be transferred into a human cell in place of the native chromosomes.