Trump’s HHS and NIH are planning to invest $500 million in a killed-whole-virus approach to universal vaccines, including such vaccines for flu and COVID. Here’s why that’s challenging

The top US health department plans to require placebo testing for all vaccines in an effort to offer "straightforward" public health information, but experts say such testing could limit availability and raise ethical concerns.

In a shift away from next-generation Covid-19 vaccines, the Trump administration is investing $500 million in a vaccine project championed by two scientists who were recently tapped to serve in senior roles within the National Institutes of Health,